diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3907836..07a66bc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,16 @@
 # Changelog
 
+## v0.39.0 — 2026-09-21 12:02
+- **Maintenance (ISS-069).** Planes wear out and can be repaired: distance-based health, a broken state that burns more fuel, and a repair action that grounds the plane for 3 sim days. New balance constants in `lib/game/catalog.ts` (all ponytail-tunable): `WEAR_PER_KM = 0.005`, `BROKEN_BURN_MULTIPLIER = 1.5`, `REPAIR_COST = 1_500` (flat), `REPAIR_DURATION_MS = 3 × 86_400_000`, plus the pure helper `conditionBurnMultiplier(health)` — exactly 1 above zero health, ×1.5 at/below it
+- **Schema.** Two new `planes` columns in all four places: Drizzle schema (`lib/db/schema.ts`), raw DDL + guarded `ALTER TABLE … ADD COLUMN` migrations in `migrateColumns()` (pre-existing rows backfill to full health / NULL gate, mirroring the weight_kg/special precedent), and the seed insert path — starter plane in `buildSeed` (`lib/game/seed.ts`) and every `buyPlane` delivery start at `health: 100`. New plane status `'repairing'` added to the three pinned unions (schema enum, `PlaneState`, OpenAPI) plus `mapData.ts`'s feature props
+- **Wear.** At landing only — `deliverPackages` (`lib/sim/engine.ts`) drops health by `WEAR_PER_KM × distanceKm` per landed leg (clamped at 0), in both the grounded and auto-chain write branches. A broken plane is one with `health ≤ 0`: it still flies, but burns ×1.5 more fuel — applied as a third factor alongside wind at ALL FIVE burn sites that hold the plane row: `flyPlane` dispatch feasibility + `refuelPlane` forFlight requirement (`lib/game/actions.ts`), engine landed-fuel + auto-chain next-leg check (`lib/sim/engine.ts`), and the live in-flight gauge in `livePlane()` (`lib/game/state.ts`). The engine's landed fuel uses the PRE-landing health (frozen at departure, like fuel) so it stays bit-consistent with the UI gauge; the chained leg's feasibility uses the post-wear value
+- **Repair.** New action `repairPlane` (`lib/game/actions.ts`) + POST `/api/planes/{planeId}/repair` (no body): 404 unknown plane, 409 not grounded ("only grounded planes can be repaired"), free no-op at full health (mirrors refuel), else charges the flat `REPAIR_COST`, restores health to 100 and grounds the plane in `'repairing'` with a gate at `clockMs + REPAIR_DURATION_MS`. The engine's new `finishRepairs` pass (same shape as `expirePackages`) runs inside every advancing tick — even when nothing landed — flipping gated planes back to `'available'` and clearing the gate. While repairing, the existing `status !== 'available'` guards in load/fly/refuel/sell/abandon block everything automatically
+- **Snapshot & OpenAPI.** `PlaneState` gains `health: number` + `repairUntilSimTime: number | null`; the repair endpoint is documented (200 → snapshot, 404/409). Pins updated in lockstep: `lib/openapi.test.ts` (fourteen endpoints, nine action-endpoint loop with errorCodes `['404','409']`, PlaneState key list) and `e2e/api.spec.ts`
+- **UI.** The fleet rows (`components/LeftPane.tsx`) show an amber health bar (new `.health-bar`, modeled on `.fuel-bar`) + a `{n}%` readout next to the fuel text; grounded planes get a red "broken" pill at zero health and an amber "in repair" pill while the gate runs (`.status-broken` / `.status-repairing`). A Repair button appears for any grounded plane below full health — no cost preview, flat cost is server-side only
+- **Test hook.** POST `/api/test/set-health` (`FLIGHT_TEST_HOOKS=1` only): `{ planeId, health?, repairUntilMs? }` forces a plane's health (finite in [0,100]) and/or sets its repair gate to `clock + repairUntilMs` — lets e2e force the broken state and shorten an active 3-day gate without flying thousands of km
+- **Tests.** New unit tests: wear accumulation per landed leg + clamping at 0 across multiple legs; broken-state ×1.5 landed fuel vs a healthy control on the identical leg; `conditionBurnMultiplier` pins; `flyPlane` feasibility using the adjusted requirement (same tank flyable at full health, 409 when broken); `repairPlane` (exact cost/status/gate/health, free no-op, 409s for flying/repairing/insufficient funds, load/fly/refuel/sell all blocked while repairing) and `finishRepairs` (gate boundary + flip-back through a full `tickOnce` with nothing landed). E2E: new `e2e/maintenance.spec.ts` — the visible flow per the issue (force 42 → UI shows it; force 0 → broken pill + short full-tank leg lands with exactly the ×1.5-adjusted fuel from the real lib helpers; click Repair → exact cash drop + "in repair" pill; shorten the gate via the hook → back to service at health 100), restoring a clean starter on exit
+- **E2E drift mitigation.** Wear accumulates across the whole CI run (one shared DB, workers:1) — the self-heal helpers in `e2e/right-pane.spec.ts` (`flyHomeViaApi`), `e2e/two-planes.spec.ts` (`resetFleet`) and `e2e/actions.spec.ts` (`flyHomeViaApi`) now restore full health + clear any active repair gate first, so the farthest-flyable pickers and the FAR round-trip feasibility pin never see a worn or broken starter
+
 ## v0.38.0 — 2026-09-21 10:47
 - **Reputation economy (ISS-072).** Reputation is no longer a dead stat — it drives the economy through three simple tunable formulas, all built on one new pure helper `repRate(reputation, perPoint, cap)` in `lib/game/catalog.ts` (linear above the starting value of 10, capped; exactly 0 at/below start so default-rep behavior is byte-identical):
   - **Cheaper plane purchases** — `buyPlane` (`lib/game/actions.ts`) charges `price × (1 − repRate(rep, PLANE_DISCOUNT_PER_REP = 0.01, MAX_PLANE_DISCOUNT = 0.4))`, rounded to 2dp; the effective cost drives both the funds check and the deduction (up to 40% off at rep ≥ 50)
diff --git a/app/api/planes/[planeId]/repair/route.ts b/app/api/planes/[planeId]/repair/route.ts
new file mode 100644
index 0000000..0e55838
--- /dev/null
+++ b/app/api/planes/[planeId]/repair/route.ts
@@ -0,0 +1,12 @@
+import { performAction, repairPlane } from '@/lib/game/actions';
+
+// POST /api/planes/:planeId/repair (v0.39.0, ISS-069) — no body. Restores a worn-out plane to
+// full health for the flat REPAIR_COST: it is grounded in "repairing" status until 3 sim days
+// pass, when the engine's tick flips it back to "available". A full-health repair is a free
+// no-op (cost 0). 404 unknown id; 409 plane not grounded or insufficient funds. On success
+// returns the full state snapshot.
+
+export async function POST(_req: Request, ctx: { params: Promise<{ planeId: string }> }) {
+  const { planeId } = await ctx.params;
+  return performAction((inst) => repairPlane(inst, planeId));
+}
diff --git a/app/api/test/set-health/route.ts b/app/api/test/set-health/route.ts
new file mode 100644
index 0000000..cac2b4e
--- /dev/null
+++ b/app/api/test/set-health/route.ts
@@ -0,0 +1,82 @@
+import { eq } from 'drizzle-orm';
+import { getGameDb, persist } from '@/lib/db/client';
+import * as schema from '@/lib/db/schema';
+import { getStateSnapshot } from '@/lib/game/state';
+import { tickNow } from '@/lib/sim/engine';
+
+// TEST-ONLY hook (v0.39.0, ISS-069) — lets the e2e suite force a plane's health and/or shorten an
+// active repair gate without flying thousands of km or waiting 3 sim days. Disabled unless
+// FLIGHT_TEST_HOOKS=1 (set in docker-compose.yml for the e2e instance only); every other
+// deployment 404s here. Sibling of /api/test/add-cash — same gate, same conventions.
+//
+// POST /api/test/set-health
+//   body { planeId: string, health?: number, repairUntilMs?: number }
+//   - planeId is required and must name an existing plane (404 otherwise);
+//   - at least one of health / repairUntilMs must be present;
+//   - health must be a finite number in [0, 100];
+//   - repairUntilMs sets repair_until_sim_time = clock + repairUntilMs (the expire-package
+//     near-term-gate precedent) so the next advancing tick flips a shortened repair back.
+//   Returns the full state snapshot after ticking.
+
+export async function POST(req: Request) {
+  if (process.env.FLIGHT_TEST_HOOKS !== '1') {
+    return Response.json({ error: 'test hooks disabled' }, { status: 404 });
+  }
+
+  let body: unknown = {};
+  try {
+    const text = await req.text();
+    body = text ? JSON.parse(text) : {};
+  } catch {
+    return Response.json({ error: 'invalid JSON body' }, { status: 400 });
+  }
+  if (typeof body !== 'object' || body === null || Array.isArray(body)) {
+    return Response.json({ error: 'body must be a JSON object' }, { status: 400 });
+  }
+  const input = body as Record<string, unknown>;
+  for (const key of Object.keys(input)) {
+    if (key !== 'planeId' && key !== 'health' && key !== 'repairUntilMs') {
+      return Response.json({ error: `unknown field "${key}"` }, { status: 400 });
+    }
+  }
+  const planeId = input.planeId;
+  if (typeof planeId !== 'string' || planeId.length === 0) {
+    return Response.json({ error: 'planeId is required and must be a non-empty string' }, { status: 400 });
+  }
+  let health: number | undefined;
+  if (input.health !== undefined) {
+    if (typeof input.health !== 'number' || !Number.isFinite(input.health) || input.health < 0 || input.health > 100) {
+      return Response.json({ error: 'health must be a finite number in [0, 100]' }, { status: 400 });
+    }
+    health = input.health;
+  }
+  let repairUntilMs: number | undefined;
+  if (input.repairUntilMs !== undefined) {
+    if (typeof input.repairUntilMs !== 'number' || !Number.isFinite(input.repairUntilMs)) {
+      return Response.json({ error: 'repairUntilMs must be a finite number' }, { status: 400 });
+    }
+    repairUntilMs = input.repairUntilMs;
+  }
+  if (health === undefined && repairUntilMs === undefined) {
+    return Response.json({ error: 'at least one of health or repairUntilMs is required' }, { status: 400 });
+  }
+
+  try {
+    const inst = await getGameDb();
+    const sim = await tickNow(); // clock is current before we set the gate (same as siblings)
+    const rows = await inst.db.select().from(schema.planes).where(eq(schema.planes.id, planeId));
+    if (!rows[0]) {
+      return Response.json({ error: `plane ${planeId} not found` }, { status: 404 });
+    }
+
+    const sets: Partial<Pick<schema.PlaneRow, 'health' | 'repairUntilSimTime'>> = {};
+    if (health !== undefined) sets.health = health;
+    if (repairUntilMs !== undefined) sets.repairUntilSimTime = Math.round(sim.clockMs + repairUntilMs);
+    await inst.db.update(schema.planes).set(sets).where(eq(schema.planes.id, planeId));
+    await persist(inst);
+    return Response.json(await getStateSnapshot());
+  } catch (err) {
+    console.error('test hook failed', err);
+    return Response.json({ error: 'test hook failed' }, { status: 500 });
+  }
+}
diff --git a/app/globals.css b/app/globals.css
index 4df7ef7..b362dfa 100644
--- a/app/globals.css
+++ b/app/globals.css
@@ -214,6 +214,17 @@ body {
   color: #bfdbfe;
 }
 
+/* v0.39.0 (ISS-069): maintenance pills on fleet rows — broken = red, in repair = amber. */
+.status-broken {
+  background: rgba(239, 68, 68, 0.25);
+  color: #fecaca;
+}
+
+.status-repairing {
+  background: rgba(245, 158, 11, 0.25);
+  color: #fde68a;
+}
+
 /* v0.37.0 (ISS-073): special-status pill on package rows — sky-blue accent, modeled on .plane-status. */
 .special-badge {
   font-size: 11px;
@@ -237,6 +248,26 @@ body {
   background: #34d399;
 }
 
+/* v0.39.0 (ISS-069): health bar — modeled on .fuel-bar, amber fill. */
+.health-bar {
+  height: 4px;
+  border-radius: 2px;
+  background: rgba(148, 163, 184, 0.25);
+  margin: 2px 0 4px;
+  overflow: hidden;
+}
+
+.health-bar > div {
+  height: 100%;
+  border-radius: 2px;
+  background: #f59e0b;
+}
+
+/* v0.39.0 (ISS-069): the per-plane Repair button sits under the readout row. */
+.repair-btn {
+  margin-top: 6px;
+}
+
 .plane-sub {
   display: flex;
   justify-content: space-between;
diff --git a/components/LeftPane.tsx b/components/LeftPane.tsx
index 12197b1..30b09a7 100644
--- a/components/LeftPane.tsx
+++ b/components/LeftPane.tsx
@@ -368,17 +368,44 @@ export default function LeftPane({ state, loading, error, onRefresh, applySnapsh
                             )}
                           </>
                         ) : (
-                          <span className="plane-status status-available">{p.locationIcao}</span>
+                          <>
+                            <span className="plane-status status-available">{p.locationIcao}</span>
+                            {/* v0.39.0 (ISS-069): maintenance pills — "in repair" while the gate runs, "broken" at zero health. */}
+                            {p.status === 'repairing' && (
+                              <span data-testid={`plane-repairing-${p.id}`} className="plane-status status-repairing">in repair</span>
+                            )}
+                            {p.health <= 0 && (
+                              <span data-testid={`plane-broken-${p.id}`} className="plane-status status-broken">broken</span>
+                            )}
+                          </>
                         )}
                       </div>
                       <div className="fuel-bar" aria-hidden="true">
                         <div style={{ width: `${Math.max(0, Math.min(100, (p.fuel / p.maxFuel) * 100))}%` }} />
                       </div>
+                      {/* v0.39.0 (ISS-069): health bar — sibling of the fuel bar, amber fill. */}
+                      <div className="health-bar" aria-hidden="true">
+                        <div style={{ width: `${Math.max(0, Math.min(100, p.health))}%` }} />
+                      </div>
                       <div className="plane-sub">
                         <span data-testid={`plane-fuel-${p.id}`}>{formatFuel(p.fuel, p.maxFuel)}</span>
+                        {/* v0.39.0 (ISS-069): health percentage next to the fuel readout. */}
+                        <span data-testid={`plane-health-${p.id}`}>{Math.round(p.health)}%</span>
                         <span data-testid={`plane-loadout-${p.id}`}>{loadoutFor(state, p)}</span>
                         <span className="plane-loc">{planeLocation(p)}</span>
                       </div>
+                      {/* v0.39.0 (ISS-069): repair — grounded plane with worn health; flat cost is server-side only (no preview). */}
+                      {p.status === 'available' && p.health < 100 && (
+                        <button
+                          type="button"
+                          data-testid={`repair-${p.id}`}
+                          className="pane-btn repair-btn"
+                          disabled={actionsBusy}
+                          onClick={() => void runAction(`/api/planes/${p.id}/repair`)}
+                        >
+                          Repair
+                        </button>
+                      )}
                       {cargo.map((pkg) => {
                         const penalty = abandonPenalty(pkg, clockMs);
                         return (
diff --git a/components/right-pane.test.ts b/components/right-pane.test.ts
index 2fcfb85..8c5f408 100644
--- a/components/right-pane.test.ts
+++ b/components/right-pane.test.ts
@@ -24,6 +24,8 @@ function plane(over: Partial<PlaneState> & Pick<PlaneState, 'id'>): PlaneState {
     departureSimTime: null,
     lat: 50,
     lon: 8.5,
+    health: 100, // v0.39.0 (ISS-069) — full-health fixture default
+    repairUntilSimTime: null,
     queue: [],
     ...over,
   };
diff --git a/e2e/actions.spec.ts b/e2e/actions.spec.ts
index 40886e2..5432ba7 100644
--- a/e2e/actions.spec.ts
+++ b/e2e/actions.spec.ts
@@ -118,7 +118,11 @@ test.describe.configure({ mode: 'serial' }); // shared live DB — order matters
 // (repositioning needs no package — v0.12.0 manual flight), and abandon any leftover cargo so
 // exact cash/rep assertions start from a clean baseline even after an interrupted previous run.
 async function flyHomeViaApi(page: Page): Promise<void> {
-  let s = await getState(page);
+  // v0.39.0 (ISS-069): wear accumulates across the shared CI DB — restore full health and clear any
+  // active repair gate from an interrupted run before the steps below act on the starter, so the FAR
+  // round-trip feasibility pin never sees a worn or broken plane.
+  expect((await page.request.post('/api/test/set-health', { data: { planeId: 'plane-starter', health: 100, repairUntilMs: 0 } })).status()).toBe(200);
+  let s = await getState(page); // ticks — a shortened gate flips the plane back to available here
   let plane = s.planes.find((p) => p.id === 'plane-starter')!;
   if (plane.status === 'flying' || plane.locationIcao !== HUB) {
     // Fast-forward any leftover leg / repositioning flight (~20 s real time worst case at 1000×).
diff --git a/e2e/api.spec.ts b/e2e/api.spec.ts
index fa90f28..1e34039 100644
--- a/e2e/api.spec.ts
+++ b/e2e/api.spec.ts
@@ -13,7 +13,7 @@ test('GET /api/version returns the app version from package.json', async ({ page
   expect(body.version).toBe(pkg.version);
 });
 
-test('GET /api/openapi serves the spec with all thirteen endpoints and the package.json version', async ({ page }) => {
+test('GET /api/openapi serves the spec with all fourteen endpoints and the package.json version', async ({ page }) => {
   const res = await page.request.get('/api/openapi');
   expect(res.status()).toBe(200);
   expect(res.headers()['content-type']).toContain('application/json');
@@ -32,6 +32,7 @@ test('GET /api/openapi serves the spec with all thirteen endpoints and the packa
     '/api/planes/{planeId}/queue',
     '/api/planes/{planeId}/queue/cancel',
     '/api/planes/{planeId}/refuel',
+    '/api/planes/{planeId}/repair', // v0.39.0 (ISS-069)
     '/api/sim',
     '/api/state',
     '/api/version',
diff --git a/e2e/maintenance.spec.ts b/e2e/maintenance.spec.ts
new file mode 100644
index 0000000..eaa2d34
--- /dev/null
+++ b/e2e/maintenance.spec.ts
@@ -0,0 +1,250 @@
+import type { Page } from '@playwright/test';
+import { expect, test } from '@playwright/test';
+// Real helpers (v0.39.0) — the broken-state burn math must match lib/ exactly; Playwright resolves
+// the repo's tsconfig paths, so importing beats mirroring a third copy of the formulas.
+import { initialBearingDeg } from '../lib/geo';
+import { weatherFor } from '../lib/weather';
+import { fuelAtWeighted, windBurnFactor } from '../lib/sim/movement';
+// v0.39.0 (ISS-069) — maintenance: expectations use the real balance constants + burn helpers.
+import { BROKEN_BURN_MULTIPLIER, REPAIR_COST } from '../lib/game/catalog';
+
+// v0.39.0 (ISS-069) — maintenance visible flow against the live origin: health is shown per plane in
+// the fleet list; forcing it to 0 via the set-health hook shows the "broken" pill and makes a short
+// full-tank leg burn ×1.5 more fuel (asserted with the real lib helpers); clicking Repair deducts
+// exactly REPAIR_COST, restores health and grounds the plane ("in repair" pill) until its gate
+// passes; shortening the gate via the hook brings it back to service on the next tick.
+
+const SCALE = 1000; // fastest sim speed (v0.14.0 ladder top) — keeps flights to seconds of real time
+const HUB = 'EDDF'; // must match HUB_ICAO in lib/game/seed.ts
+const STARTER = 'plane-starter';
+
+interface PlaneState {
+  id: string;
+  model: string;
+  status: 'available' | 'flying' | 'repairing';
+  fuel: number;
+  maxFuel: number;
+  locationIcao: string;
+  destIcao: string | null;
+  health: number; // v0.39.0 (ISS-069) — structural health in [0, 100]
+  repairUntilSimTime: number | null; // v0.39.0 (ISS-069) — active repair gate
+}
+
+interface CatalogEntry {
+  model: string;
+  burnPerKm: number;
+  emptyWeightKg: number;
+  maxFuel: number;
+}
+
+interface StateBody {
+  account: { cash: number };
+  simState: { clockMs: number; timeScale: number; paused: boolean };
+  planes: PlaneState[];
+  catalog: CatalogEntry[];
+}
+
+async function getState(page: Page): Promise<StateBody> {
+  const res = await page.request.get('/api/state');
+  expect(res.status()).toBe(200);
+  return (await res.json()) as StateBody;
+}
+
+// Set the time scale and VERIFY from the response that it stuck — a silent reset would otherwise
+// surface as an unexplained wait timeout. Also clears pause (ISS-041: landings slow to 1×).
+async function setScale(page: Page, scale: number): Promise<void> {
+  const res = await page.request.post('/api/sim', { data: { timeScale: scale, paused: false } });
+  expect(res.status()).toBe(200);
+  const body = (await res.json()) as { timeScale: number };
+  expect(body.timeScale, `timeScale should be ${scale} after POST /api/sim`).toBe(scale);
+}
+
+// Test hook (FLIGHT_TEST_HOOKS=1): force a plane's health and/or shorten an active repair gate.
+async function setHealth(
+  page: Page,
+  body: { planeId: string; health?: number; repairUntilMs?: number },
+): Promise<StateBody> {
+  const res = await page.request.post('/api/test/set-health', { data: body });
+  expect(res.status()).toBe(200);
+  return (await res.json()) as StateBody;
+}
+
+// Mirrors haversineKm in lib/geo.ts (same formula → identical floats).
+function haversineKm(lat1: number, lon1: number, lat2: number, lon2: number): number {
+  const toRad = (d: number) => (d * Math.PI) / 180;
+  const dLat = toRad(lat2 - lat1);
+  const dLon = toRad(lon2 - lon1);
+  const a =
+    Math.sin(dLat / 2) ** 2 +
+    Math.cos(toRad(lat1)) * Math.cos(toRad(lat2)) * Math.sin(dLon / 2) ** 2;
+  return 2 * 6371 * Math.asin(Math.min(1, Math.sqrt(a)));
+}
+
+// Closest airport to EDDF from /api/airports — the short fixed leg for the broken-burn flight.
+// Returns both endpoints' coordinates so the exact-km fuel assertion can mirror lib/geo.ts.
+async function nearestToHub(page: Page): Promise<{ icao: string; lat: number; lon: number; hubLat: number; hubLon: number }> {
+  const fc = (await (await page.request.get('/api/airports')).json()) as {
+    features: Array<{ properties: { icao: string; lat: number; lon: number } }>;
+  };
+  const hub = fc.features.find((f) => f.properties.icao === HUB)!.properties;
+  let nearest = fc.features.filter((f) => f.properties.icao !== HUB)[0].properties;
+  for (const f of fc.features) {
+    if (f.properties.icao === HUB) continue;
+    if (haversineKm(hub.lat, hub.lon, f.properties.lat, f.properties.lon) < haversineKm(hub.lat, hub.lon, nearest.lat, nearest.lon)) {
+      nearest = f.properties;
+    }
+  }
+  return { icao: nearest.icao, lat: nearest.lat, lon: nearest.lon, hubLat: hub.lat, hubLon: hub.lon };
+}
+
+// Self-heal: let any in-flight leg finish and reposition plane-starter to the hub (shared DB — an
+// interrupted earlier run may have left it elsewhere or airborne). Same pattern as flyHomeViaApi in
+// right-pane.spec.ts; cargo cleanup is skipped because this flow asserts cash DELTAS, not absolutes.
+async function healStarterHome(page: Page): Promise<void> {
+  let s = await getState(page);
+  let starter = s.planes.find((p) => p.id === STARTER)!;
+  if (starter.status === 'repairing') {
+    // An interrupted run may have left it mid-repair — shorten the gate so the next tick flips it back.
+    await setHealth(page, { planeId: STARTER, health: 100, repairUntilMs: 0 });
+    await expect
+      .poll(async () => ((await getState(page)).planes.find((p) => p.id === STARTER)?.status ?? ''), {
+        timeout: 30_000,
+        message: 'waiting for the shortened repair gate to flip plane-starter back',
+      })
+      .toBe('available');
+    s = await getState(page);
+    starter = s.planes.find((p) => p.id === STARTER)!;
+  }
+  if (starter.status === 'flying' || starter.locationIcao !== HUB) {
+    // Fast-forward any leftover leg / repositioning flight (~20 s real time worst case at 1000×).
+    await setScale(page, SCALE);
+  }
+  if (starter.status === 'flying') {
+    await expect
+      .poll(async () => ((await getState(page)).planes.find((p) => p.id === STARTER)?.status ?? ''), {
+        timeout: 240_000,
+        message: 'waiting for an in-flight plane-starter to land',
+      })
+      .toBe('available');
+    s = await getState(page);
+    starter = s.planes.find((p) => p.id === STARTER)!;
+  }
+  if (starter.locationIcao !== HUB) {
+    // ISS-041: the landing above slowed the sim to 1× — setScale restores it for the return leg.
+    await setScale(page, SCALE);
+    let flyHome = await page.request.post(`/api/planes/${STARTER}/fly`, { data: { destIcao: HUB } });
+    if (!flyHome.ok()) {
+      // A long outbound leg can leave the tank too empty for the return — top up and retry.
+      expect((await page.request.post(`/api/planes/${STARTER}/refuel`)).status()).toBe(200);
+      flyHome = await page.request.post(`/api/planes/${STARTER}/fly`, { data: { destIcao: HUB } });
+    }
+    expect(flyHome.status()).toBe(200); // repositioning needs no package (v0.12.0 manual flight)
+    await expect
+      .poll(async () => ((await getState(page)).planes.find((p) => p.id === STARTER)?.locationIcao ?? ''), {
+        timeout: 240_000,
+        message: 'waiting for plane-starter to land back at the hub',
+      })
+      .toBe(HUB);
+  }
+}
+
+// Leave a clean starter for later spec files (shared DB, workers:1): full health and no active
+// repair gate — an interrupted run may have left the plane mid-repair or worn down.
+async function restoreStarter(page: Page): Promise<void> {
+  const s = await getState(page);
+  const starter = s.planes.find((p) => p.id === STARTER)!;
+  const body: { planeId: string; health?: number; repairUntilMs?: number } = { planeId: STARTER, health: 100 };
+  if (starter.status === 'repairing') body.repairUntilMs = 0; // shorten the active gate → flips on the next tick
+  await setHealth(page, body);
+}
+
+test.describe.configure({ mode: 'serial' }); // shared live DB — order matters within this file
+
+// On exit (success or failure): restore scale=1 / unpaused for the other specs (house convention)
+// and leave a clean starter — full health, no active repair gate.
+test.afterEach(async ({ page }) => {
+  const res = await page.request.post('/api/sim', { data: { timeScale: 1, paused: false } });
+  expect(res.status()).toBe(200);
+  await restoreStarter(page);
+});
+
+test('health shown → broken burn ×1.5 → repair grounds for 3 sim days → back to service', async ({ page }) => {
+  test.setTimeout(300_000); // self-heal + one short leg at 1000× + the shortened repair gate wait
+
+  await healStarterHome(page); // deterministic: the starter sits grounded at EDDF
+
+  // (a) Force health to 42 — snapshot AND UI show it.
+  let s = await setHealth(page, { planeId: STARTER, health: 42 });
+  expect(s.planes.find((p) => p.id === STARTER)!.health).toBe(42);
+
+  await page.goto('/');
+  const row = page.getByTestId(`plane-${STARTER}`);
+  await expect(row, 'the starter fleet row renders').toBeVisible({ timeout: 15_000 });
+  await expect(page.getByTestId(`plane-health-${STARTER}`), 'health readout shows the forced value')
+    .toContainText('42%');
+
+  // (b) Force broken — the pill shows, and a short full-tank leg burns ×1.5 more fuel.
+  s = await setHealth(page, { planeId: STARTER, health: 0 });
+  expect(s.planes.find((p) => p.id === STARTER)!.health).toBe(0);
+  await expect(page.getByTestId(`plane-broken-${STARTER}`), 'the broken pill appears')
+    .toHaveText('broken', { timeout: 15_000 });
+
+  // Full tank for the flight (free no-op if already full)…
+  expect((await page.request.post(`/api/planes/${STARTER}/refuel`)).status()).toBe(200);
+  s = await getState(page);
+  const starter = s.planes.find((p) => p.id === STARTER)!;
+  expect(starter.fuel).toBe(starter.maxFuel);
+
+  // …then fly the short fixed leg HUB → nearest via the API (the UI under test is maintenance, not dispatch).
+  const nearest = await nearestToHub(page);
+  expect((await page.request.post(`/api/planes/${STARTER}/fly`, { data: { destIcao: nearest.icao } })).status()).toBe(200);
+  await setScale(page, SCALE);
+  await expect
+    .poll(async () => ((await getState(page)).planes.find((p) => p.id === STARTER)?.locationIcao ?? ''), {
+      timeout: 120_000,
+      message: 'waiting for the broken plane to land at the nearest airport',
+    })
+    .toBe(nearest.icao);
+
+  // Landed fuel matches the ×1.5-adjusted closed form (real lib helpers — same pattern as right-pane.spec.ts).
+  s = await getState(page);
+  const landed = s.planes.find((p) => p.id === STARTER)!;
+  const entry = s.catalog.find((e) => e.model === starter.model)!;
+  const km = haversineKm(nearest.hubLat, nearest.hubLon, nearest.lat, nearest.lon);
+  const wHub = weatherFor(HUB);
+  const burn = entry.burnPerKm * windBurnFactor(wHub.windKt, wHub.windDirDeg, initialBearingDeg(nearest.hubLat, nearest.hubLon, nearest.lat, nearest.lon));
+  expect(landed.fuel).toBeCloseTo(fuelAtWeighted(starter.maxFuel, burn * BROKEN_BURN_MULTIPLIER, entry.emptyWeightKg, entry.maxFuel, km, 1), 6);
+  // Wear clamped at 0 — the broken plane stays broken.
+  expect(landed.health).toBe(0);
+
+  // (c) Repair through the UI: exact cash drop + "in repair" pill.
+  const cashBefore = s.account.cash;
+  const repairBtn = page.getByTestId(`repair-${STARTER}`);
+  await expect(repairBtn, 'the Repair button shows for a grounded worn plane').toBeVisible({ timeout: 15_000 });
+  // The click fires the POST asynchronously — capture the endpoint's OWN response so the cash drop is
+  // checked against the exact game clock the server used (a later GET would tick further).
+  const [res] = await Promise.all([
+    page.waitForResponse((r) => r.url().includes(`/api/planes/${STARTER}/repair`), { timeout: 15_000 }),
+    repairBtn.click(),
+  ]);
+  expect(res.status()).toBe(200);
+  const post = (await res.json()) as StateBody; // full post-action snapshot at the action's clock
+  expect(post.account.cash).toBeCloseTo(cashBefore - REPAIR_COST, 6); // exactly REPAIR_COST
+  const repaired = post.planes.find((p) => p.id === STARTER)!;
+  expect(repaired.status).toBe('repairing');
+  expect(repaired.health).toBe(100); // restored to full…
+  expect(repaired.repairUntilSimTime).not.toBeNull(); // …with the gate set (3 sim days out)
+
+  await expect(page.getByTestId(`plane-repairing-${STARTER}`), 'the "in repair" pill appears')
+    .toHaveText('in repair', { timeout: 15_000 });
+
+  // (d) Shorten the gate via the hook — the plane comes back to service on the next tick.
+  await setHealth(page, { planeId: STARTER, repairUntilMs: 10_000 });
+  await setScale(page, SCALE); // fast-forward the shortened gate (each tick advances up to 2 s × scale)
+  await expect
+    .poll(async () => {
+      const p = (await getState(page)).planes.find((x) => x.id === STARTER)!;
+      return p.status === 'available' && p.health === 100 ? true : false;
+    }, { timeout: 60_000, message: 'waiting for the shortened repair gate to flip the plane back' })
+    .toBe(true);
+});
diff --git a/e2e/right-pane.spec.ts b/e2e/right-pane.spec.ts
index 1faa293..678984d 100644
--- a/e2e/right-pane.spec.ts
+++ b/e2e/right-pane.spec.ts
@@ -184,7 +184,11 @@ async function createPackage(page: Page, fromIcao: string, toIcao: string, deadl
 
 // Self-heal: let any in-flight leg finish, then reposition plane-starter home via the API.
 async function flyHomeViaApi(page: Page): Promise<void> {
-  const s0 = await getState(page);
+  // v0.39.0 (ISS-069): wear accumulates across the shared CI DB — restore full health and clear any
+  // active repair gate from an interrupted run before the steps below act on the starter, so the
+  // farthest-flyable picker and fuel pins never see a worn or broken plane.
+  expect((await page.request.post('/api/test/set-health', { data: { planeId: 'plane-starter', health: 100, repairUntilMs: 0 } })).status()).toBe(200);
+  const s0 = await getState(page); // ticks — a shortened gate flips the plane back to available here
   const starter = s0.planes.find((p) => p.id === 'plane-starter')!;
   if (starter.status === 'flying' || starter.locationIcao !== HUB) {
     // Fast-forward any leftover leg / repositioning flight (~20 s real time worst case at 1000×).
diff --git a/e2e/two-planes.spec.ts b/e2e/two-planes.spec.ts
index f62d465..617fab1 100644
--- a/e2e/two-planes.spec.ts
+++ b/e2e/two-planes.spec.ts
@@ -275,8 +275,11 @@ async function sellNonStarters(page: Page): Promise<void> {
 // Canonical start state for every test: fleet of exactly one plane (the starter), grounded at EDDF,
 // no cargo on board — even after an interrupted previous run.
 async function resetFleet(page: Page): Promise<void> {
+  // v0.39.0 (ISS-069): wear accumulates across the shared CI DB — restore full health and clear any
+  // active repair gate before healing, so the farthest-flyable picker never sees a worn/broken starter.
+  expect((await page.request.post('/api/test/set-health', { data: { planeId: STARTER, health: 100, repairUntilMs: 0 } })).status()).toBe(200);
   await sellNonStarters(page);
-  await healPlaneHome(page, STARTER);
+  await healPlaneHome(page, STARTER); // the tick inside its getState flips a shortened gate back to available
   await abandonLeftoverCargo(page, STARTER);
 }
 
diff --git a/lib/db/client.ts b/lib/db/client.ts
index e09111e..de92c2b 100644
--- a/lib/db/client.ts
+++ b/lib/db/client.ts
@@ -31,7 +31,9 @@ CREATE TABLE IF NOT EXISTS planes (
   lat REAL NOT NULL,
   lon REAL NOT NULL,
   departure_sim_time INTEGER,
-  queue TEXT NOT NULL DEFAULT '[]'
+  queue TEXT NOT NULL DEFAULT '[]',
+  health REAL NOT NULL DEFAULT 100,
+  repair_until_sim_time INTEGER
 );
 CREATE TABLE IF NOT EXISTS packages (
   id TEXT PRIMARY KEY NOT NULL,
@@ -88,6 +90,14 @@ function migrateColumns(raw: RawSqlJsDatabase): void {
   if (!cols('packages').has('special')) {
     raw.exec('ALTER TABLE packages ADD COLUMN special TEXT');
   }
+  // v0.39.0 (ISS-069): plane health — pre-existing rows backfill to full health.
+  if (!cols('planes').has('health')) {
+    raw.exec('ALTER TABLE planes ADD COLUMN health REAL NOT NULL DEFAULT 100');
+  }
+  // v0.39.0 (ISS-069): repair gate — nullable, no default; pre-existing rows stay NULL = not in repair.
+  if (!cols('planes').has('repair_until_sim_time')) {
+    raw.exec('ALTER TABLE planes ADD COLUMN repair_until_sim_time INTEGER');
+  }
   // v0.30.0 (ISS-057): last-selected speed — pre-existing rows backfill to the row's OWN
   // current time_scale so a legacy DB resumes at the speed it was running, not the default.
   if (!cols('sim_state').has('last_selected_time_scale')) {
diff --git a/lib/db/schema.ts b/lib/db/schema.ts
index ad037f5..7a44726 100644
--- a/lib/db/schema.ts
+++ b/lib/db/schema.ts
@@ -7,7 +7,9 @@ import { integer, real, sqliteTable, text } from 'drizzle-orm/sqlite-core';
 export const planes = sqliteTable('planes', {
   id: text('id').primaryKey().notNull(),
   model: text('model').notNull(),
-  status: text('status', { enum: ['available', 'flying'] }).notNull(),
+  // v0.39.0 (ISS-069): 'repairing' = grounded in the shop until repairUntilSimTime passes; the
+  // engine flips it back to 'available' on a tick. All status guards key off 'available'.
+  status: text('status', { enum: ['available', 'flying', 'repairing'] }).notNull(),
   fuel: real('fuel').notNull(),
   maxFuel: real('max_fuel').notNull(),
   locationIcao: text('location_icao').notNull(),
@@ -24,6 +26,12 @@ export const planes = sqliteTable('planes', {
   // of ICAO strings ('[]' when empty). The ACTIVE leg stays destIcao +
   // departureSimTime; on landing the engine auto-chains queue[0] if fuel covers it.
   queue: text('queue').notNull().default('[]'),
+  // Structural health in [0, 100] (v0.39.0, ISS-069) — wears down by WEAR_PER_KM per km of
+  // landed legs; at 0 the plane is broken and burns BROKEN_BURN_MULTIPLIER × more fuel.
+  health: real('health').notNull().default(100),
+  // Sim-clock epoch ms when an active repair finishes (v0.39.0, ISS-069) — set with status
+  // 'repairing', cleared by the engine's flip-back pass; NULL = not in repair.
+  repairUntilSimTime: integer('repair_until_sim_time'),
 });
 
 // Cargo packages (v0.12.0) replace the old contracts table end-to-end: a package
diff --git a/lib/deriveEvents.test.ts b/lib/deriveEvents.test.ts
index 6969275..68fa93f 100644
--- a/lib/deriveEvents.test.ts
+++ b/lib/deriveEvents.test.ts
@@ -22,6 +22,8 @@ const basePlane = (id: string): PlaneState => ({
   departureSimTime: null,
   lat: 50.03,
   lon: 8.56,
+  health: 100, // v0.39.0 (ISS-069) — full-health fixture default
+  repairUntilSimTime: null,
   queue: [],
 });
 
diff --git a/lib/game/actions.test.ts b/lib/game/actions.test.ts
index 90b4015..aa33ce8 100644
--- a/lib/game/actions.test.ts
+++ b/lib/game/actions.test.ts
@@ -10,12 +10,15 @@ import { haversineKm, initialBearingDeg } from '@/lib/geo';
 import { weatherFor } from '@/lib/weather';
 import { requiredFuelFor, windBurnFactor } from '@/lib/sim/movement';
 import {
+  BROKEN_BURN_MULTIPLIER,
   FUEL_DISCOUNT_PER_REP,
   FUEL_PRICE_PER_L,
   MAX_FUEL_DISCOUNT,
   MAX_PLANE_DISCOUNT,
   PLANE_DISCOUNT_PER_REP,
   PLANE_TYPES,
+  REPAIR_COST,
+  REPAIR_DURATION_MS,
   repRate,
   SELL_FRACTION,
 } from './catalog';
@@ -30,6 +33,7 @@ import {
   loadPackage,
   queueLeg,
   refuelPlane,
+  repairPlane,
   sellPlane,
 } from './actions';
 
@@ -233,6 +237,30 @@ describe('flyPlane', () => {
 
     await expectActionError(flyPlane(inst, 'plane-starter', 'LEMD'), 409, /insufficient fuel/i);
   });
+
+  it('uses the ×1.5 broken burn for fuel feasibility when health is 0 (v0.39.0, ISS-069)', async () => {
+    const inst = await freshDb('fly-broken.db'); // EDDF → LEMD
+    const fc = await loadAirportsGeoJson();
+    const from = fc.features.find((f) => f.properties.icao === HUB_ICAO)!.properties;
+    const to = fc.features.find((f) => f.properties.icao === 'LEMD')!.properties;
+    const km = haversineKm(from.lat, from.lon, to.lat, to.lon);
+    const type = PLANE_TYPES.atr72;
+    const w = weatherFor(HUB_ICAO);
+    const f = windBurnFactor(w.windKt, w.windDirDeg, initialBearingDeg(from.lat, from.lon, to.lat, to.lon));
+    // The tank holds EXACTLY the healthy requirement — a broken plane needs more than that.
+    await inst.db.update(schema.planes)
+      .set({ health: 0, fuel: requiredFuelFor(type.burnPerKm * f, type.emptyWeightKg, type.maxFuel, km) })
+      .where(eq(schema.planes.id, 'plane-starter'));
+
+    await expectActionError(flyPlane(inst, 'plane-starter', 'LEMD'), 409, /insufficient fuel/i);
+
+    // Same tank at full health is flyable — the broken multiplier is what blocked it.
+    const inst2 = await freshDb('fly-broken-healthy.db');
+    await inst2.db.update(schema.planes)
+      .set({ fuel: requiredFuelFor(type.burnPerKm * f, type.emptyWeightKg, type.maxFuel, km) })
+      .where(eq(schema.planes.id, 'plane-starter'));
+    await flyPlane(inst2, 'plane-starter', 'LEMD'); // must not throw
+  });
 });
 
 describe('queueLeg (v0.25.0, ISS-043)', () => {
@@ -779,3 +807,83 @@ describe('refuelPlane', () => {
     );
   });
 });
+
+describe('repairPlane (v0.39.0, ISS-069)', () => {
+  it('charges exactly REPAIR_COST, restores health to 100 and grounds the plane for REPAIR_DURATION_MS', async () => {
+    const inst = await freshDb('repair-ok.db');
+    await inst.db.update(schema.planes).set({ health: 42 }).where(eq(schema.planes.id, 'plane-starter'));
+    const cashBefore = (await inst.db.select().from(schema.account))[0].cash;
+
+    const { cost } = await repairPlane(inst, 'plane-starter');
+
+    expect(cost).toBe(REPAIR_COST);
+    const plane = (await inst.db.select().from(schema.planes))[0];
+    expect(plane.status).toBe('repairing');
+    expect(plane.health).toBe(100); // restored to full…
+    expect(plane.repairUntilSimTime).toBe(T0 + REPAIR_DURATION_MS); // …with the gate set from the seeded clock (no tick in direct calls)
+    const account = (await inst.db.select().from(schema.account))[0];
+    expect(account.cash).toBeCloseTo(cashBefore - REPAIR_COST, 6);
+  });
+
+  it('is a free no-op when health is already full', async () => {
+    const inst = await freshDb('repair-full.db'); // seeded starter at 100
+    const cashBefore = (await inst.db.select().from(schema.account))[0].cash;
+
+    const { cost } = await repairPlane(inst, 'plane-starter');
+
+    expect(cost).toBe(0);
+    const plane = (await inst.db.select().from(schema.planes))[0];
+    expect(plane.status).toBe('available'); // not grounded…
+    expect(plane.health).toBe(100);
+    expect(plane.repairUntilSimTime ?? null).toBeNull(); // …and no gate set
+    expect((await inst.db.select().from(schema.account))[0].cash).toBe(cashBefore);
+  });
+
+  it('rejects a flying plane with 409', async () => {
+    const inst = await freshDb('repair-flying.db');
+    await inst.db.update(schema.planes)
+      .set({ status: 'flying', departureSimTime: T0, destIcao: 'LEMD' })
+      .where(eq(schema.planes.id, 'plane-starter'));
+
+    await expectActionError(repairPlane(inst, 'plane-starter'), 409, /only grounded planes can be repaired/);
+  });
+
+  it('rejects a plane that is already repairing with 409', async () => {
+    const inst = await freshDb('repair-busy.db');
+    await inst.db.update(schema.planes)
+      .set({ status: 'repairing', repairUntilSimTime: T0 + REPAIR_DURATION_MS })
+      .where(eq(schema.planes.id, 'plane-starter'));
+
+    await expectActionError(repairPlane(inst, 'plane-starter'), 409, /only grounded planes can be repaired/);
+  });
+
+  it('blocks load/fly/refuel/sell while repairing (the existing status guards)', async () => {
+    const inst = await freshDb('repair-blocks.db');
+    await inst.db.update(schema.planes).set({ health: 50 }).where(eq(schema.planes.id, 'plane-starter'));
+    await repairPlane(inst, 'plane-starter');
+
+    await insertOpenPackage(inst); // open package at the hub — loadable if the plane were grounded
+    await expectActionError(loadPackage(inst, 'p-open', 'plane-starter'), 409, /repairing/);
+    await expectActionError(flyPlane(inst, 'plane-starter', 'LEMD'), 409, /repairing/);
+    await expectActionError(refuelPlane(inst, 'plane-starter'), 409, /repairing/);
+    // A second plane so the "last remaining" guard cannot fire before the status one.
+    await inst.db.insert(schema.planes).values({
+      id: 'plane-extra', model: 'atr72', status: 'available', fuel: 100, maxFuel: PLANE_TYPES.atr72.maxFuel,
+      locationIcao: HUB_ICAO, destIcao: null, lat: 50, lon: 8, departureSimTime: null,
+    });
+    await expectActionError(sellPlane(inst, 'plane-starter'), 409, /repairing/);
+  });
+
+  it('rejects the repair when cash is below REPAIR_COST with 409', async () => {
+    const inst = await freshDb('repair-poor.db');
+    await inst.db.update(schema.planes).set({ health: 50 }).where(eq(schema.planes.id, 'plane-starter'));
+    await inst.db.update(schema.account).set({ cash: REPAIR_COST - 1 });
+
+    await expectActionError(repairPlane(inst, 'plane-starter'), 409, /insufficient funds/i);
+  });
+
+  it('rejects an unknown id with 404', async () => {
+    const inst = await freshDb('repair-unknown.db');
+    await expectActionError(repairPlane(inst, 'ghost'), 404);
+  });
+});
diff --git a/lib/game/actions.ts b/lib/game/actions.ts
index d3f1fd9..575cc61 100644
--- a/lib/game/actions.ts
+++ b/lib/game/actions.ts
@@ -9,12 +9,15 @@ import { requiredFuelFor, windBurnFactor } from '@/lib/sim/movement';
 import { runAction } from '@/lib/sim/engine';
 import { getStateSnapshot, parseIcaoQueue } from './state';
 import {
+  conditionBurnMultiplier,
   FUEL_DISCOUNT_PER_REP,
   FUEL_PRICE_PER_L,
   MAX_FUEL_DISCOUNT,
   MAX_PLANE_DISCOUNT,
   PLANE_DISCOUNT_PER_REP,
   PLANE_TYPES,
+  REPAIR_COST,
+  REPAIR_DURATION_MS,
   repRate,
   SELL_FRACTION,
 } from './catalog';
@@ -118,8 +121,9 @@ export async function flyPlane(inst: GameDb, planeId: string, destIcao: string):
   const distanceKm = haversineKm(origin.lat, origin.lon, destFeature.properties.lat, destFeature.properties.lon);
   // Weighted burn model (v0.16.0): the leg needs enough fuel to cover it arriving empty; wind-
   // adjusted (v0.36.0) by departure weather vs route heading — every call site uses this same factor.
+  // v0.39.0 (ISS-069): a broken plane (health ≤ 0) burns BROKEN_BURN_MULTIPLIER × more per km.
   const w = weatherFor(plane.locationIcao);
-  const burnPerKm = type.burnPerKm * windBurnFactor(w.windKt, w.windDirDeg, initialBearingDeg(origin.lat, origin.lon, destFeature.properties.lat, destFeature.properties.lon));
+  const burnPerKm = type.burnPerKm * windBurnFactor(w.windKt, w.windDirDeg, initialBearingDeg(origin.lat, origin.lon, destFeature.properties.lat, destFeature.properties.lon)) * conditionBurnMultiplier(plane.health);
   const requiredL = requiredFuelFor(burnPerKm, type.emptyWeightKg, type.maxFuel, distanceKm);
   if (requiredL > plane.fuel) {
     throw new GameActionError(409, `insufficient fuel: the leg needs ${Math.round(requiredL)} L but the plane has ${Math.round(plane.fuel)} L`);
@@ -284,6 +288,7 @@ export async function buyPlane(inst: GameDb, model: string): Promise<{ planeId:
     lat: home.lat,
     lon: home.lon,
     departureSimTime: null,
+    health: 100, // new planes arrive at full health (v0.39.0, ISS-069)
   });
   await inst.db.update(schema.account).set({ cash: Math.round((account.cash - cost) * 100) / 100 });
   await persist(inst);
@@ -367,10 +372,11 @@ export async function refuelPlane(inst: GameDb, planeId: string, opts: RefuelOpt
     const origin = await airportByIcao(plane.locationIcao);
     const dest = await airportByIcao(pkg.destIcao);
     const distanceKm = haversineKm(origin.lat, origin.lon, dest.lat, dest.lon);
-    // Same wind-adjusted requirement flyPlane checks (v0.36.0) — departure weather vs route heading.
+    // Same wind-adjusted requirement flyPlane checks (v0.36.0) — departure weather vs route heading;
+    // v0.39.0 (ISS-069): broken planes burn BROKEN_BURN_MULTIPLIER × more, same factor as flyPlane.
     const w = weatherFor(plane.locationIcao);
     const requiredL = requiredFuelFor(
-      type.burnPerKm * windBurnFactor(w.windKt, w.windDirDeg, initialBearingDeg(origin.lat, origin.lon, dest.lat, dest.lon)),
+      type.burnPerKm * windBurnFactor(w.windKt, w.windDirDeg, initialBearingDeg(origin.lat, origin.lon, dest.lat, dest.lon)) * conditionBurnMultiplier(plane.health),
       type.emptyWeightKg,
       type.maxFuel,
       distanceKm,
@@ -404,6 +410,38 @@ export async function refuelPlane(inst: GameDb, planeId: string, opts: RefuelOpt
   return { cost };
 }
 
+// --- Repair (POST /api/planes/:planeId/repair) — v0.39.0 (ISS-069) ---
+
+// Restore a worn-out plane to full health for the flat REPAIR_COST; it is grounded in 'repairing'
+// status until sim.clockMs + REPAIR_DURATION_MS, when the engine's tick flips it back to
+// 'available'. Only GROUNDED planes can be repaired (409 otherwise); an already-full-health
+// repair is a free no-op (mirrors refuel's). 404 unknown plane; 409 not grounded / insufficient funds.
+export async function repairPlane(inst: GameDb, planeId: string): Promise<{ cost: number }> {
+  const rows = await inst.db.select().from(schema.planes).where(eq(schema.planes.id, planeId));
+  const plane = rows[0];
+  if (!plane) throw new GameActionError(404, `plane ${planeId} not found`);
+  if (plane.status !== 'available') {
+    throw new GameActionError(409, `plane is ${plane.status}, only grounded planes can be repaired`);
+  }
+  // Free no-op when the plane is already at full health — nothing to repair.
+  if (plane.health >= 100) return { cost: 0 };
+
+  const sim = (await inst.db.select().from(schema.simState))[0];
+  if (!sim) throw new Error('sim_state row missing');
+  const account = (await inst.db.select().from(schema.account))[0];
+  if (!account) throw new Error('account row missing');
+  if (account.cash < REPAIR_COST) {
+    throw new GameActionError(409, `insufficient funds: repair costs ${REPAIR_COST}, you have ${Math.round(account.cash)}`);
+  }
+
+  await inst.db.update(schema.planes)
+    .set({ health: 100, status: 'repairing', repairUntilSimTime: sim.clockMs + REPAIR_DURATION_MS })
+    .where(eq(schema.planes.id, planeId));
+  await inst.db.update(schema.account).set({ cash: Math.round((account.cash - REPAIR_COST) * 100) / 100 });
+  await persist(inst);
+  return { cost: REPAIR_COST };
+}
+
 // --- Route helper (response convention, v0.8.0) ---
 
 // Run an action under the sim lock — tick FIRST so validation/mutation see current
diff --git a/lib/game/catalog.test.ts b/lib/game/catalog.test.ts
index 6d8aebc..82a5334 100644
--- a/lib/game/catalog.test.ts
+++ b/lib/game/catalog.test.ts
@@ -1,5 +1,5 @@
 import { describe, expect, it } from 'vitest';
-import { FUEL_DISCOUNT_PER_REP, MAX_FUEL_DISCOUNT, MAX_PLANE_DISCOUNT, PLANE_DISCOUNT_PER_REP, PLANE_TYPES, repRate, STARTER_MODEL } from './catalog';
+import { BROKEN_BURN_MULTIPLIER, conditionBurnMultiplier, FUEL_DISCOUNT_PER_REP, MAX_FUEL_DISCOUNT, MAX_PLANE_DISCOUNT, PLANE_DISCOUNT_PER_REP, PLANE_TYPES, repRate, STARTER_MODEL } from './catalog';
 import { STARTING_REPUTATION } from './seed';
 
 // v0.28.0 (ISS-047) — catalog sanity: the progression ladder must stay well-formed as types are added.
@@ -43,3 +43,21 @@ describe('repRate', () => {
     expect(repRate(1_000_000, FUEL_DISCOUNT_PER_REP, MAX_FUEL_DISCOUNT)).toBe(MAX_FUEL_DISCOUNT);
   });
 });
+
+// v0.39.0 (ISS-069) — the broken-state burn factor: ×BROKEN_BURN_MULTIPLIER at/below zero health, exactly 1 above it.
+describe('conditionBurnMultiplier', () => {
+  it('is exactly 1 for any positive health', () => {
+    expect(conditionBurnMultiplier(100)).toBe(1);
+    expect(conditionBurnMultiplier(42)).toBe(1);
+    expect(conditionBurnMultiplier(0.5)).toBe(1); // worn but not broken
+  });
+
+  it('is exactly BROKEN_BURN_MULTIPLIER at and below zero health', () => {
+    expect(conditionBurnMultiplier(0)).toBe(BROKEN_BURN_MULTIPLIER);
+    expect(conditionBurnMultiplier(-3)).toBe(BROKEN_BURN_MULTIPLIER); // defensive — wear clamps at 0, but the gate is <= 0
+  });
+
+  it('pins the broken multiplier at ×1.5', () => {
+    expect(BROKEN_BURN_MULTIPLIER).toBe(1.5);
+  });
+});
diff --git a/lib/game/catalog.ts b/lib/game/catalog.ts
index 7c6f0b6..1c4de8e 100644
--- a/lib/game/catalog.ts
+++ b/lib/game/catalog.ts
@@ -122,6 +122,25 @@ export const FUEL_DISCOUNT_PER_REP = 0.005;
 // ponytail: balance-tunable — max refuel price discount (reached at rep ≥ 50).
 export const MAX_FUEL_DISCOUNT = 0.2;
 
+// --- Maintenance (v0.39.0, ISS-069) ---
+
+// ponytail: balance-tunable — health lost per km of landed legs (~13 mid-range EDDF↔LEMD hops to break from full).
+export const WEAR_PER_KM = 0.005;
+
+// ponytail: balance-tunable — burn multiplier for a broken plane (health ≤ 0): it still flies, just thirsty.
+export const BROKEN_BURN_MULTIPLIER = 1.5;
+
+// Broken-state burn factor for one plane's health — the third multiplicative term alongside wind at every
+// per-plane burn site (flyPlane feasibility, refuel forFlight, engine landed fuel + auto-chain, live display).
+export function conditionBurnMultiplier(health: number): number {
+  return health <= 0 ? BROKEN_BURN_MULTIPLIER : 1;
+}
+
+// ponytail: balance-tunable — flat repair cost in € (per-type if balance demands it).
+export const REPAIR_COST = 1_500;
+// ponytail: balance-tunable — how long a repair grounds the plane, sim ms (3 game days).
+export const REPAIR_DURATION_MS = 3 * 86_400_000;
+
 // Snapshot shape of one catalog entry in GET /api/state (v0.10.0): `model` is the
 // id used by buy/dispatch, `label` the display name — clients compute all market
 // previews (buy price, sell payout, refuel cost) from these + the economy constants.
diff --git a/lib/game/seed.test.ts b/lib/game/seed.test.ts
index bc2e821..95b645a 100644
--- a/lib/game/seed.test.ts
+++ b/lib/game/seed.test.ts
@@ -49,6 +49,7 @@ describe('buildSeed', () => {
       lat: 50.0333,
       lon: 8.5706,
       queue: [], // v0.25.0 (ISS-043) — no queued legs on first run
+      health: 100, // v0.39.0 (ISS-069) — full health on first run
     });
   });
 
diff --git a/lib/game/seed.ts b/lib/game/seed.ts
index c9b605b..c10d52e 100644
--- a/lib/game/seed.ts
+++ b/lib/game/seed.ts
@@ -42,6 +42,8 @@ export interface SeedPlane {
   // Upcoming legs not yet started (v0.25.0, ISS-043) — serialized to the queue
   // column as JSON text on insert; defaults to an empty queue.
   queue?: string[];
+  // Structural health in [0, 100] (v0.39.0, ISS-069) — new planes start at full health.
+  health: number;
 }
 
 export interface SeedPackage {
@@ -237,6 +239,7 @@ export function buildSeed(input: {
     lat: hub.lat,
     lon: hub.lon,
     queue: [], // no queued legs on first run (v0.25.0)
+    health: 100, // full health on first run (v0.39.0, ISS-069)
   };
 
   const count = PACKAGE_COUNT_MIN + Math.floor(rng() * (PACKAGE_COUNT_MAX - PACKAGE_COUNT_MIN + 1));
diff --git a/lib/game/state.ts b/lib/game/state.ts
index f203409..43cb4d9 100644
--- a/lib/game/state.ts
+++ b/lib/game/state.ts
@@ -3,7 +3,7 @@ import { haversineKm, initialBearingDeg } from '@/lib/geo';
 import { weatherFor } from '@/lib/weather';
 import { getGameDb } from '@/lib/db/client';
 import * as schema from '@/lib/db/schema';
-import { catalogEntries, FUEL_PRICE_PER_L, PLANE_TYPES, SELL_FRACTION, type CatalogEntry } from './catalog';
+import { conditionBurnMultiplier, catalogEntries, FUEL_PRICE_PER_L, PLANE_TYPES, SELL_FRACTION, type CatalogEntry } from './catalog';
 import { fuelAtWeighted, progressAt, positionAt, windBurnFactor } from '@/lib/sim/movement';
 
 // Read-only game-state snapshot for client polling (GET /api/state).
@@ -11,7 +11,8 @@ import { fuelAtWeighted, progressAt, positionAt, windBurnFactor } from '@/lib/si
 export interface PlaneState {
   id: string;
   model: string;
-  status: 'available' | 'flying';
+  // v0.39.0 (ISS-069): 'repairing' = grounded in the shop until repairUntilSimTime passes.
+  status: 'available' | 'flying' | 'repairing';
   fuel: number;
   maxFuel: number;
   locationIcao: string;
@@ -28,6 +29,11 @@ export interface PlaneState {
   // Upcoming legs NOT yet started (v0.25.0, ISS-043) — ordered ICAOs; the active
   // leg is destIcao. The engine auto-chains queue[0] on landing when fuel covers it.
   queue: string[];
+  // Structural health in [0, 100] (v0.39.0, ISS-069) — wears down with distance flown; at 0 the
+  // plane is broken and burns BROKEN_BURN_MULTIPLIER × more fuel until repaired.
+  health: number;
+  // Sim-clock epoch ms when an active repair finishes (v0.39.0, ISS-069); null when not in repair.
+  repairUntilSimTime: number | null;
 }
 
 // Parse the planes.queue JSON column into an ICAO list (v0.25.0). Guards against
@@ -107,10 +113,12 @@ export async function getStateSnapshot(): Promise<StateSnapshot> {
     const pos = positionAt(from.lat, from.lon, to.lat, to.lon, progress);
     // Wind-adjusted burn (v0.36.0) — weather is a pure function of the departure ICAO, so this
     // recomputes exactly the factor the engine used for the leg; no stored state needed.
+    // v0.39.0 (ISS-069): broken planes burn BROKEN_BURN_MULTIPLIER × more — p.health is frozen at
+    // departure (wear lands only), so this stays bit-consistent with the engine's landed fuel.
     const w = weatherFor(p.locationIcao);
     return { ...pos, fuel: fuelAtWeighted(
       p.fuel,
-      type.burnPerKm * windBurnFactor(w.windKt, w.windDirDeg, initialBearingDeg(from.lat, from.lon, to.lat, to.lon)),
+      type.burnPerKm * windBurnFactor(w.windKt, w.windDirDeg, initialBearingDeg(from.lat, from.lon, to.lat, to.lon)) * conditionBurnMultiplier(p.health),
       type.emptyWeightKg,
       type.maxFuel,
       distanceKm,
@@ -140,6 +148,8 @@ export async function getStateSnapshot(): Promise<StateSnapshot> {
         lat: live?.lat ?? p.lat,
         lon: live?.lon ?? p.lon,
         queue: parseIcaoQueue(p.queue),
+        health: p.health, // v0.39.0 (ISS-069) — stored value; wear accumulates at landing only
+        repairUntilSimTime: p.repairUntilSimTime,
       };
     }),
     packages: packageRows.map((p) => ({
diff --git a/lib/mapData.test.ts b/lib/mapData.test.ts
index 3e8e58f..a419917 100644
--- a/lib/mapData.test.ts
+++ b/lib/mapData.test.ts
@@ -34,8 +34,8 @@ describe('planesGeoJson', () => {
     const fc = planesGeoJson(
       snapshot({
         planes: [
-          { id: 'plane-starter', model: 'atr72', status: 'available', fuel: 6300, maxFuel: 6300, locationIcao: 'EDDF', locationName: 'Frankfurt Main Airport', destIcao: null, destName: null, departureSimTime: null, lat: 50.03, lon: 8.56, queue: [] },
-          { id: 'plane-2', model: 'atr72', status: 'flying', fuel: 4000, maxFuel: 6300, locationIcao: 'EDDF', locationName: 'Frankfurt Main Airport', destIcao: 'EDDV', destName: 'Hannover Airport', departureSimTime: 1000, lat: 51.2, lon: 9.1, queue: [] },
+          { id: 'plane-starter', model: 'atr72', status: 'available', fuel: 6300, maxFuel: 6300, locationIcao: 'EDDF', locationName: 'Frankfurt Main Airport', destIcao: null, destName: null, departureSimTime: null, lat: 50.03, lon: 8.56, health: 100, repairUntilSimTime: null, queue: [] },
+          { id: 'plane-2', model: 'atr72', status: 'flying', fuel: 4000, maxFuel: 6300, locationIcao: 'EDDF', locationName: 'Frankfurt Main Airport', destIcao: 'EDDV', destName: 'Hannover Airport', departureSimTime: 1000, lat: 51.2, lon: 9.1, health: 100, repairUntilSimTime: null, queue: [] },
         ],
       }),
     );
@@ -61,7 +61,7 @@ describe('planesGeoJson', () => {
       snapshot({
         catalog: [],
         planes: [
-          { id: 'p1', model: 'mystery', status: 'available', fuel: 1, maxFuel: 2, locationIcao: 'EDDF', locationName: 'x', destIcao: null, destName: null, departureSimTime: null, lat: 0, lon: 0, queue: [] },
+          { id: 'p1', model: 'mystery', status: 'available', fuel: 1, maxFuel: 2, locationIcao: 'EDDF', locationName: 'x', destIcao: null, destName: null, departureSimTime: null, lat: 0, lon: 0, health: 100, repairUntilSimTime: null, queue: [] },
         ],
       }),
     );
@@ -72,7 +72,7 @@ describe('planesGeoJson', () => {
     const fc = planesGeoJson(
       snapshot({
         planes: [
-          { id: 'p1', model: 'atr72', status: 'flying', fuel: 1, maxFuel: 2, locationIcao: 'EDDF', locationName: 'x', destIcao: null, destName: null, departureSimTime: 0, lat: 0, lon: 0, queue: [] },
+          { id: 'p1', model: 'atr72', status: 'flying', fuel: 1, maxFuel: 2, locationIcao: 'EDDF', locationName: 'x', destIcao: null, destName: null, departureSimTime: 0, lat: 0, lon: 0, health: 100, repairUntilSimTime: null, queue: [] },
         ],
       }),
     );
@@ -89,7 +89,7 @@ describe('routesGeoJson (v0.12.0 — one line per flying plane\'s current leg)',
     const fc = routesGeoJson(
       snapshot({
         planes: [
-          { id: 'p1', model: 'atr72', status: 'available', fuel: 1, maxFuel: 2, locationIcao: 'EDDF', locationName: 'F', destIcao: null, destName: null, departureSimTime: null, lat: 50.03, lon: 8.56, queue: [] },
+          { id: 'p1', model: 'atr72', status: 'available', fuel: 1, maxFuel: 2, locationIcao: 'EDDF', locationName: 'F', destIcao: null, destName: null, departureSimTime: null, lat: 50.03, lon: 8.56, health: 100, repairUntilSimTime: null, queue: [] },
         ],
       }),
       AIRPORTS,
@@ -101,7 +101,7 @@ describe('routesGeoJson (v0.12.0 — one line per flying plane\'s current leg)',
     const fc = routesGeoJson(
       snapshot({
         planes: [
-          { id: 'p1', model: 'atr72', status: 'flying', fuel: 1, maxFuel: 2, locationIcao: 'EDDF', locationName: 'F', destIcao: 'EHAM', destName: 'A', departureSimTime: 0, lat: 51, lon: 9, queue: [] },
+          { id: 'p1', model: 'atr72', status: 'flying', fuel: 1, maxFuel: 2, locationIcao: 'EDDF', locationName: 'F', destIcao: 'EHAM', destName: 'A', departureSimTime: 0, lat: 51, lon: 9, health: 100, repairUntilSimTime: null, queue: [] },
         ],
       }),
       AIRPORTS,
@@ -118,7 +118,7 @@ describe('routesGeoJson (v0.12.0 — one line per flying plane\'s current leg)',
     const fc = routesGeoJson(
       snapshot({
         planes: [
-          { id: 'p1', model: 'atr72', status: 'flying', fuel: 1, maxFuel: 2, locationIcao: 'ZZZZ', locationName: '?', destIcao: 'EDDV', destName: 'H', departureSimTime: 0, lat: 0, lon: 0, queue: [] },
+          { id: 'p1', model: 'atr72', status: 'flying', fuel: 1, maxFuel: 2, locationIcao: 'ZZZZ', locationName: '?', destIcao: 'EDDV', destName: 'H', departureSimTime: 0, lat: 0, lon: 0, health: 100, repairUntilSimTime: null, queue: [] },
         ],
       }),
       AIRPORTS,
@@ -130,8 +130,8 @@ describe('routesGeoJson (v0.12.0 — one line per flying plane\'s current leg)',
     const fc = routesGeoJson(
       snapshot({
         planes: [
-          { id: 'p1', model: 'atr72', status: 'flying', fuel: 1, maxFuel: 2, locationIcao: 'EDDF', locationName: 'F', destIcao: 'EDDV', destName: 'H', departureSimTime: 0, lat: 51, lon: 9, queue: [] },
-          { id: 'p2', model: 'atr72', status: 'flying', fuel: 1, maxFuel: 2, locationIcao: 'EDDV', locationName: 'H', destIcao: 'EHAM', destName: 'A', departureSimTime: 0, lat: 52.4, lon: 9.6, queue: [] },
+          { id: 'p1', model: 'atr72', status: 'flying', fuel: 1, maxFuel: 2, locationIcao: 'EDDF', locationName: 'F', destIcao: 'EDDV', destName: 'H', departureSimTime: 0, lat: 51, lon: 9, health: 100, repairUntilSimTime: null, queue: [] },
+          { id: 'p2', model: 'atr72', status: 'flying', fuel: 1, maxFuel: 2, locationIcao: 'EDDV', locationName: 'H', destIcao: 'EHAM', destName: 'A', departureSimTime: 0, lat: 52.4, lon: 9.6, health: 100, repairUntilSimTime: null, queue: [] },
         ],
       }),
       AIRPORTS,
@@ -144,7 +144,7 @@ describe('queuedRoutesGeoJson (ISS-043 v0.26.0 — dotted queue line: dest → q
   it('draws nothing for a grounded plane, even with a non-empty queue', () => {
     const fc = queuedRoutesGeoJson(
       [
-        { id: 'p1', model: 'atr72', status: 'available', fuel: 1, maxFuel: 2, locationIcao: 'EDDF', locationName: 'F', destIcao: null, destName: null, departureSimTime: null, lat: 50.03, lon: 8.56, queue: ['EHAM'] },
+        { id: 'p1', model: 'atr72', status: 'available', fuel: 1, maxFuel: 2, locationIcao: 'EDDF', locationName: 'F', destIcao: null, destName: null, departureSimTime: null, lat: 50.03, lon: 8.56, health: 100, repairUntilSimTime: null, queue: ['EHAM'] },
       ],
       AIRPORTS,
     );
@@ -154,7 +154,7 @@ describe('queuedRoutesGeoJson (ISS-043 v0.26.0 — dotted queue line: dest → q
   it('draws nothing for a flying plane with an empty queue', () => {
     const fc = queuedRoutesGeoJson(
       [
-        { id: 'p1', model: 'atr72', status: 'flying', fuel: 1, maxFuel: 2, locationIcao: 'EDDF', locationName: 'F', destIcao: 'EHAM', destName: 'A', departureSimTime: 0, lat: 51, lon: 9, queue: [] },
+        { id: 'p1', model: 'atr72', status: 'flying', fuel: 1, maxFuel: 2, locationIcao: 'EDDF', locationName: 'F', destIcao: 'EHAM', destName: 'A', departureSimTime: 0, lat: 51, lon: 9, health: 100, repairUntilSimTime: null, queue: [] },
       ],
       AIRPORTS,
     );
@@ -165,7 +165,7 @@ describe('queuedRoutesGeoJson (ISS-043 v0.26.0 — dotted queue line: dest → q
     const fc = queuedRoutesGeoJson(
       [
         // Active leg EDDF→EHAM stays in routesGeoJson; the queue line is ONLY EHAM → EDDV → LEMD.
-        { id: 'p1', model: 'atr72', status: 'flying', fuel: 1, maxFuel: 2, locationIcao: 'EDDF', locationName: 'F', destIcao: 'EHAM', destName: 'A', departureSimTime: 0, lat: 51, lon: 9, queue: ['EDDV', 'LEMD'] },
+        { id: 'p1', model: 'atr72', status: 'flying', fuel: 1, maxFuel: 2, locationIcao: 'EDDF', locationName: 'F', destIcao: 'EHAM', destName: 'A', departureSimTime: 0, lat: 51, lon: 9, health: 100, repairUntilSimTime: null, queue: ['EDDV', 'LEMD'] },
       ],
       AIRPORTS,
     );
@@ -182,8 +182,8 @@ describe('queuedRoutesGeoJson (ISS-043 v0.26.0 — dotted queue line: dest → q
   it('skips a plane whose dest or a queued ICAO is missing from the airport index', () => {
     const fc = queuedRoutesGeoJson(
       [
-        { id: 'p1', model: 'atr72', status: 'flying', fuel: 1, maxFuel: 2, locationIcao: 'EDDF', locationName: 'F', destIcao: 'ZZZZ', destName: '?', departureSimTime: 0, lat: 51, lon: 9, queue: ['EHAM'] },
-        { id: 'p2', model: 'atr72', status: 'flying', fuel: 1, maxFuel: 2, locationIcao: 'EDDF', locationName: 'F', destIcao: 'EHAM', destName: 'A', departureSimTime: 0, lat: 51, lon: 9, queue: ['ZZZZ'] },
+        { id: 'p1', model: 'atr72', status: 'flying', fuel: 1, maxFuel: 2, locationIcao: 'EDDF', locationName: 'F', destIcao: 'ZZZZ', destName: '?', departureSimTime: 0, lat: 51, lon: 9, health: 100, repairUntilSimTime: null, queue: ['EHAM'] },
+        { id: 'p2', model: 'atr72', status: 'flying', fuel: 1, maxFuel: 2, locationIcao: 'EDDF', locationName: 'F', destIcao: 'EHAM', destName: 'A', departureSimTime: 0, lat: 51, lon: 9, health: 100, repairUntilSimTime: null, queue: ['ZZZZ'] },
       ],
       AIRPORTS,
     );
@@ -193,9 +193,9 @@ describe('queuedRoutesGeoJson (ISS-043 v0.26.0 — dotted queue line: dest → q
   it('one feature per qualifying plane — grounded and empty-queue planes draw nothing', () => {
     const fc = queuedRoutesGeoJson(
       [
-        { id: 'p1', model: 'atr72', status: 'flying', fuel: 1, maxFuel: 2, locationIcao: 'EDDF', locationName: 'F', destIcao: 'EHAM', destName: 'A', departureSimTime: 0, lat: 51, lon: 9, queue: ['LEMD'] },
-        { id: 'p2', model: 'atr72', status: 'flying', fuel: 1, maxFuel: 2, locationIcao: 'EHAM', locationName: 'A', destIcao: 'EDDV', destName: 'H', departureSimTime: 0, lat: 52.3, lon: 4.7, queue: [] },
-        { id: 'p3', model: 'atr72', status: 'available', fuel: 1, maxFuel: 2, locationIcao: 'EDDV', locationName: 'H', destIcao: null, destName: null, departureSimTime: null, lat: 52.46, lon: 9.68, queue: ['LEMD'] },
+        { id: 'p1', model: 'atr72', status: 'flying', fuel: 1, maxFuel: 2, locationIcao: 'EDDF', locationName: 'F', destIcao: 'EHAM', destName: 'A', departureSimTime: 0, lat: 51, lon: 9, health: 100, repairUntilSimTime: null, queue: ['LEMD'] },
+        { id: 'p2', model: 'atr72', status: 'flying', fuel: 1, maxFuel: 2, locationIcao: 'EHAM', locationName: 'A', destIcao: 'EDDV', destName: 'H', departureSimTime: 0, lat: 52.3, lon: 4.7, health: 100, repairUntilSimTime: null, queue: [] },
+        { id: 'p3', model: 'atr72', status: 'available', fuel: 1, maxFuel: 2, locationIcao: 'EDDV', locationName: 'H', destIcao: null, destName: null, departureSimTime: null, lat: 52.46, lon: 9.68, health: 100, repairUntilSimTime: null, queue: ['LEMD'] },
       ],
       AIRPORTS,
     );
diff --git a/lib/mapData.ts b/lib/mapData.ts
index 15ee945..4cab195 100644
--- a/lib/mapData.ts
+++ b/lib/mapData.ts
@@ -10,7 +10,8 @@ import { positionAt } from './sim/movement';
 export interface PlaneFeatureProps {
   id: string;
   modelLabel: string;
-  status: 'available' | 'flying';
+  // v0.39.0 (ISS-069): 'repairing' planes render on the grounded layer (flying === false).
+  status: 'available' | 'flying' | 'repairing';
   fuelText: string; // "1234 / 6300 L"
   routeText: string; // "Origin → Destination" while flying, '' when grounded
   flying: boolean;
diff --git a/lib/openapi.test.ts b/lib/openapi.test.ts
index 5df7df3..9e3bc2b 100644
--- a/lib/openapi.test.ts
+++ b/lib/openapi.test.ts
@@ -3,7 +3,7 @@ import { describe, expect, it } from 'vitest';
 import { openApiSpec } from './openapi';
 
 describe('OpenAPI spec', () => {
-  it('documents exactly the thirteen public endpoints (4 read + 9 player actions)', () => {
+  it('documents exactly the fourteen public endpoints (4 read + 10 player actions)', () => {
     expect(Object.keys(openApiSpec.paths).sort()).toEqual([
       '/api/airports',
       '/api/market/buy-plane',
@@ -15,6 +15,7 @@ describe('OpenAPI spec', () => {
       '/api/planes/{planeId}/queue', // v0.25.0 (ISS-043)
       '/api/planes/{planeId}/queue/cancel', // v0.25.0 (ISS-043)
       '/api/planes/{planeId}/refuel',
+      '/api/planes/{planeId}/repair', // v0.39.0 (ISS-069)
       '/api/sim',
       '/api/state',
       '/api/version',
@@ -115,6 +116,7 @@ describe('OpenAPI spec', () => {
       'destIcao',
       'destName',
       'fuel',
+      'health', // v0.39.0 (ISS-069) — structural health in [0, 100]
       'id',
       'lat',
       'locationIcao',
@@ -123,6 +125,7 @@ describe('OpenAPI spec', () => {
       'maxFuel',
       'model',
       'queue', // v0.25.0 (ISS-043) — upcoming legs not yet started
+      'repairUntilSimTime', // v0.39.0 (ISS-069) — active repair gate; null when not repairing
       'status',
     ]);
 
@@ -174,7 +177,7 @@ describe('OpenAPI spec', () => {
     expect(Object.keys(error)).toEqual(['error']);
   });
 
-  it('documents the eight action endpoints: snapshot on 200, Error on their 4xx paths', () => {
+  it('documents the nine action endpoints: snapshot on 200, Error on their 4xx paths', () => {
     // The spec object is a literal type; these helpers view it as plain JSON.
     const post = (p: string) =>
       ((openApiSpec.paths as Record<string, { post?: unknown }>)[p]?.post ?? {}) as {
@@ -193,6 +196,7 @@ describe('OpenAPI spec', () => {
       '/api/market/buy-plane',
       '/api/market/sell-plane',
       '/api/planes/{planeId}/refuel',
+      '/api/planes/{planeId}/repair', // v0.39.0 (ISS-069)
     ]) {
       const ok = post(p).responses['200'] as { content: Record<string, { schema: { $ref: string } }> };
       expect(ok.content['application/json'].schema.$ref).toBe('#/components/schemas/StateSnapshot');
@@ -208,6 +212,7 @@ describe('OpenAPI spec', () => {
     expect(errorCodes('/api/market/buy-plane')).toEqual(['400', '409']);
     expect(errorCodes('/api/market/sell-plane')).toEqual(['400', '404', '409']);
     expect(errorCodes('/api/planes/{planeId}/refuel')).toEqual(['400', '404', '409']); // v0.16.0 optional body
+    expect(errorCodes('/api/planes/{planeId}/repair')).toEqual(['404', '409']); // v0.39.0 (ISS-069) — no body, so no 400
 
     // Request bodies: load/fly/buy/sell take their dedicated schemas; abandon takes none;
     // refuel's is OPTIONAL (v0.16.0) — no body still means "fill to full".
@@ -233,6 +238,7 @@ describe('OpenAPI spec', () => {
     const refuelBody = post('/api/planes/{planeId}/refuel').requestBody;
     expect(refuelBody?.content['application/json'].schema.$ref).toBe('#/components/schemas/RefuelRequest');
     expect(refuelBody?.required).toBe(false); // optional — no body still means "fill to full"
+    expect(post('/api/planes/{planeId}/repair').requestBody).toBeUndefined(); // v0.39.0 (ISS-069) — no body, like abandon
 
     // Path parameters are declared on the parameterized routes.
     const paramNames = (p: string) => post(p).parameters?.map((x) => x.name);
@@ -242,6 +248,7 @@ describe('OpenAPI spec', () => {
     expect(paramNames('/api/planes/{planeId}/queue')).toEqual(['planeId']); // v0.25.0 (ISS-043)
     expect(paramNames('/api/planes/{planeId}/queue/cancel')).toEqual(['planeId']); // v0.25.0 (ISS-043)
     expect(paramNames('/api/planes/{planeId}/refuel')).toEqual(['planeId']);
+    expect(paramNames('/api/planes/{planeId}/repair')).toEqual(['planeId']); // v0.39.0 (ISS-069)
 
     // Request schema shapes.
     const load = openApiSpec.components.schemas.LoadPackageRequest;
diff --git a/lib/openapi.ts b/lib/openapi.ts
index 223de44..6f1329f 100644
--- a/lib/openapi.ts
+++ b/lib/openapi.ts
@@ -404,6 +404,31 @@ export const openApiSpec = {
         },
       },
     },
+    '/api/planes/{planeId}/repair': {
+      post: {
+        summary: 'Repair a grounded plane',
+        description:
+          'Restore a worn-out plane to full health for the flat repair cost (v0.39.0, ISS-069): the plane is grounded in "repairing" status until 3 sim days pass, when the engine\'s tick flips it back to "available". While repairing it cannot load, fly, refuel or be sold; a broken plane (health ≤ 0) still flies but burns 50% more fuel. A full-health repair is a free no-op (cost 0). No body.',
+        operationId: 'repairPlane',
+        parameters: [
+          { name: 'planeId', in: 'path', required: true, schema: { type: 'string' } },
+        ],
+        responses: {
+          200: {
+            description: 'Repair started (or free no-op) — full state snapshot (health 100, status "repairing" with the gate set, cash reduced by the flat cost)',
+            content: { 'application/json': { schema: { $ref: '#/components/schemas/StateSnapshot' } } },
+          },
+          404: {
+            description: 'Unknown plane id',
+            content: { 'application/json': { schema: { $ref: '#/components/schemas/Error' } } },
+          },
+          409: {
+            description: 'Plane is not grounded (flying or already repairing), or cash is insufficient for the repair cost',
+            content: { 'application/json': { schema: { $ref: '#/components/schemas/Error' } } },
+          },
+        },
+      },
+    },
   },
   components: {
     schemas: {
@@ -595,7 +620,7 @@ export const openApiSpec = {
         properties: {
           id: { type: 'string' },
           model: { type: 'string' },
-          status: { enum: ['available', 'flying'] },
+          status: { enum: ['available', 'flying', 'repairing'] }, // v0.39.0 (ISS-069) — "repairing" = grounded in the shop until repairUntilSimTime passes
           fuel: { type: 'number' },
           maxFuel: { type: 'number' },
           locationIcao: { type: 'string' },
@@ -620,6 +645,16 @@ export const openApiSpec = {
             description:
               'Upcoming flight legs NOT yet started (v0.25.0) — ordered ICAOs; the active leg is destIcao. The engine auto-chains queue[0] on landing when fuel covers it.',
           },
+          health: {
+            type: 'number',
+            description:
+              'Structural health in [0, 100] (v0.39.0) — wears down by a fixed amount per km of landed legs; at 0 the plane is broken and burns 50% more fuel until repaired.',
+          },
+          repairUntilSimTime: {
+            type: ['integer', 'null'],
+            description:
+              'Sim-clock epoch ms when an active repair finishes (v0.39.0) — set with status "repairing", cleared by the engine\'s flip-back; null when not in repair.',
+          },
         },
         required: [
           'id',
@@ -635,6 +670,8 @@ export const openApiSpec = {
           'lat',
           'lon',
           'queue',
+          'health', // v0.39.0 (ISS-069) — structural health in [0, 100]
+          'repairUntilSimTime', // v0.39.0 (ISS-069) — active repair gate; null when not repairing
         ],
       },
       PackageState: {
diff --git a/lib/sim/engine.test.ts b/lib/sim/engine.test.ts
index 388da44..7f3761e 100644
--- a/lib/sim/engine.test.ts
+++ b/lib/sim/engine.test.ts
@@ -8,7 +8,7 @@ import * as schema from '@/lib/db/schema';
 import { loadAirportsGeoJson } from '@/lib/airports';
 import { haversineKm, initialBearingDeg } from '@/lib/geo';
 import { weatherFor } from '@/lib/weather';
-import { PLANE_TYPES } from '@/lib/game/catalog';
+import { BROKEN_BURN_MULTIPLIER, PLANE_TYPES, WEAR_PER_KM } from '@/lib/game/catalog';
 import { SPECIALS } from '@/lib/game/specials';
 import { MARKET_TARGET_OPEN_PACKAGES, mulberry32 } from '@/lib/game/seed';
 import { arrivalTimeFor, fuelAtWeighted, requiredFuelFor, windBurnFactor } from './movement';
@@ -16,6 +16,7 @@ import {
   clampTimeScale,
   deliverPackages,
   expirePackages,
+  finishRepairs,
   MAX_TICK_ELAPSED_MS,
   MAX_TIME_SCALE,
   MIN_TIME_SCALE,
@@ -331,6 +332,114 @@ describe('deliverPackages (v0.12.0 arrival delivery)', () => {
   });
 });
 
+describe('wear on landed legs + broken burn (v0.39.0, ISS-069)', () => {
+  const FROM = 'EDDF';
+  const TO = 'LEMD';
+
+  // Starter flying EDDF→LEMD with a full tank — same shape as the deliverPackages setup above.
+  async function setupFlight(name: string) {
+    const inst = await freshDb(name);
+    const fc = await loadAirportsGeoJson();
+    const from = fc.features.find((f) => f.properties.icao === FROM)!.properties;
+    const to = fc.features.find((f) => f.properties.icao === TO)!.properties;
+    const km = haversineKm(from.lat, from.lon, to.lat, to.lon);
+    const type = PLANE_TYPES.atr72;
+
+    await inst.db.update(schema.planes)
+      .set({ status: 'flying', destIcao: TO, departureSimTime: T0, fuel: type.maxFuel })
+      .where(eq(schema.planes.id, 'plane-starter'));
+
+    return { inst, from, to, km, type };
+  }
+
+  it('drops health by exactly WEAR_PER_KM × km on a landed leg', async () => {
+    const { inst, km } = await setupFlight('wear-leg.db');
+
+    expect(await deliverPackages(inst, T0 + travelMs(km, PLANE_TYPES.atr72.speedKmh))).toBe(1);
+
+    const plane = (await inst.db.select().from(schema.planes))[0];
+    expect(plane.health).toBeCloseTo(100 - WEAR_PER_KM * km, 9); // one mid-range hop ≈ −9.8 health
+  });
+
+  it('clamps at 0 across multiple legs', async () => {
+    const { inst, from, to, km, type } = await setupFlight('wear-clamp.db');
+    // Start below one leg's wear so the first landing clamps…
+    await inst.db.update(schema.planes)
+      .set({ health: WEAR_PER_KM * km / 2 })
+      .where(eq(schema.planes.id, 'plane-starter'));
+
+    expect(await deliverPackages(inst, T0 + travelMs(km, type.speedKmh))).toBe(1);
+    let plane = (await inst.db.select().from(schema.planes))[0];
+    expect(plane.health).toBe(0); // clamped — never negative…
+
+    // …and a second leg keeps it pinned at 0.
+    const eham = (await loadAirportsGeoJson()).features.find((f) => f.properties.icao === 'EHAM')!.properties;
+    const nextKm = haversineKm(to.lat, to.lon, eham.lat, eham.lon);
+    await inst.db.update(schema.planes)
+      .set({ status: 'flying', destIcao: 'EHAM', departureSimTime: T0 + travelMs(km, type.speedKmh), fuel: type.maxFuel })
+      .where(eq(schema.planes.id, 'plane-starter'));
+
+    expect(await deliverPackages(inst, T0 + travelMs(km, type.speedKmh) + travelMs(nextKm, type.speedKmh))).toBe(1);
+    plane = (await inst.db.select().from(schema.planes))[0];
+    expect(plane.health).toBe(0); // still clamped after the second leg
+  });
+
+  it('a broken plane burns ×1.5 more fuel on the leg (landed fuel)', async () => {
+    const { inst, from, to, km, type } = await setupFlight('wear-broken.db');
+    await inst.db.update(schema.planes).set({ health: 0 }).where(eq(schema.planes.id, 'plane-starter'));
+
+    expect(await deliverPackages(inst, T0 + travelMs(km, type.speedKmh))).toBe(1);
+
+    const w = weatherFor(FROM);
+    const f = windBurnFactor(w.windKt, w.windDirDeg, initialBearingDeg(from.lat, from.lon, to.lat, to.lon));
+    const plane = (await inst.db.select().from(schema.planes))[0];
+    // The ×1.5-adjusted closed form — the same factor livePlane() shows in flight…
+    expect(plane.fuel).toBeCloseTo(
+      fuelAtWeighted(type.maxFuel, type.burnPerKm * f * BROKEN_BURN_MULTIPLIER, type.emptyWeightKg, type.maxFuel, km, 1),
+      6,
+    );
+
+    // …and strictly less than the healthy control on the identical leg.
+    const control = await setupFlight('wear-broken-control.db');
+    expect(await deliverPackages(control.inst, T0 + travelMs(km, type.speedKmh))).toBe(1);
+    const healthy = (await control.inst.db.select().from(schema.planes))[0];
+    expect(healthy.fuel).toBeCloseTo(fuelAtWeighted(type.maxFuel, type.burnPerKm * f, type.emptyWeightKg, type.maxFuel, km, 1), 6);
+    expect(plane.fuel).toBeLessThan(healthy.fuel); // the broken plane genuinely burned more
+  });
+});
+
+describe('finishRepairs (v0.39.0, ISS-069)', () => {
+  it('flips repairing planes back to available once the gate passes, clearing the gate', async () => {
+    const inst = await freshDb('repair-finish.db');
+    await inst.db.update(schema.planes)
+      .set({ status: 'repairing', repairUntilSimTime: T0 + 5_000 })
+      .where(eq(schema.planes.id, 'plane-starter'));
+
+    expect(await finishRepairs(inst, T0 + 4_999)).toBe(0); // gate not reached yet…
+    let plane = (await inst.db.select().from(schema.planes))[0];
+    expect(plane.status).toBe('repairing');
+
+    expect(await finishRepairs(inst, T0 + 5_000)).toBe(1); // <= is inclusive at the clock
+    plane = (await inst.db.select().from(schema.planes))[0];
+    expect(plane.status).toBe('available');
+    expect(plane.repairUntilSimTime ?? null).toBeNull(); // gate cleared
+  });
+
+  it('runs inside tickOnce even when nothing landed: a past gate flips the plane back', async () => {
+    const inst = await freshDb('repair-tick.db');
+    await inst.db.update(schema.planes)
+      .set({ status: 'repairing', repairUntilSimTime: T0 + 1_500 })
+      .where(eq(schema.planes.id, 'plane-starter'));
+
+    vi.setSystemTime(T0 + 2_000); // one clamped tick at scale 1 → clock T0+2000 ≥ gate; nothing is flying
+    await tickOnce(inst);
+
+    const plane = (await inst.db.select().from(schema.planes))[0];
+    expect(plane.status).toBe('available');
+    expect(plane.repairUntilSimTime ?? null).toBeNull();
+  });
+});
+
 describe('slow to 1× when a landing leaves any plane on the ground (ISS-057)', () => {
   const FROM = 'EDDF';
   const TO = 'LEMD';
diff --git a/lib/sim/engine.ts b/lib/sim/engine.ts
index fe5c2ba..404ca9e 100644
--- a/lib/sim/engine.ts
+++ b/lib/sim/engine.ts
@@ -5,7 +5,7 @@ import * as schema from '@/lib/db/schema';
 import { loadAirportsGeoJson } from '@/lib/airports';
 import { haversineKm, initialBearingDeg } from '@/lib/geo';
 import { weatherFor } from '@/lib/weather';
-import { PLANE_TYPES } from '@/lib/game/catalog';
+import { conditionBurnMultiplier, PLANE_TYPES, WEAR_PER_KM } from '@/lib/game/catalog';
 import { SPECIALS } from '@/lib/game/specials';
 import { parseIcaoQueue } from '@/lib/game/state';
 import {
@@ -79,6 +79,9 @@ export async function tickOnce(inst: GameDb): Promise<schema.SimStateRow> {
     await expirePackages(inst, clockMs);
     // ISS-057: remember the landings so the tick can slow down when a plane is left on ground.
     landedThisTick = await deliverPackages(inst, clockMs);
+    // v0.39.0 (ISS-069): repairs whose gate has passed flip back to 'available' — runs even when
+    // nothing landed this tick; BEFORE the spawns so a just-repaired plane gets coverage work too.
+    await finishRepairs(inst, clockMs);
     await spawnOpenPackages(inst, clockMs);
     // AFTER delivery on purpose: a plane that just landed gets work spawned
     // at its new location within the same tick.
@@ -126,6 +129,23 @@ export async function expirePackages(inst: GameDb, clockMs: number): Promise<num
   return n;
 }
 
+// Repairs whose gate has passed flip the plane back to 'available' and clear the gate
+// (v0.39.0, ISS-069) — same shape as expirePackages: one guarded pass over the rows,
+// `<=` inclusive at the clock. Returns the count flipped.
+export async function finishRepairs(inst: GameDb, clockMs: number): Promise<number> {
+  const rows = await inst.db.select().from(schema.planes).where(eq(schema.planes.status, 'repairing'));
+  let n = 0;
+  for (const p of rows) {
+    if (p.repairUntilSimTime !== null && p.repairUntilSimTime <= clockMs) {
+      await inst.db.update(schema.planes)
+        .set({ status: 'available', repairUntilSimTime: null })
+        .where(eq(schema.planes.id, p.id));
+      n++;
+    }
+  }
+  return n;
+}
+
 // Finalize in-flight planes whose arrival time has passed (v0.12.0 delivery):
 // for every package bound to the plane and destined for its dest_icao — 'loaded'
 // ones still inside their deadline are delivered (cash += reward + reputation
@@ -160,16 +180,21 @@ export async function deliverPackages(inst: GameDb, clockMs: number): Promise<nu
 
     // Arrived: progress is exactly 1 here, so remaining fuel is the full-leg weighted burn —
     // wind-adjusted (v0.36.0) by departure weather vs route heading, same factor flyPlane used.
+    // v0.39.0 (ISS-069): broken planes (health ≤ 0 at DEPARTURE) burn BROKEN_BURN_MULTIPLIER × more —
+    // p.health is the pre-landing value, so this stays bit-consistent with livePlane()'s gauge.
     const w = weatherFor(p.locationIcao);
     const landedFuel = fuelAtWeighted(
       p.fuel,
-      type.burnPerKm * windBurnFactor(w.windKt, w.windDirDeg, initialBearingDeg(from.lat, from.lon, to.lat, to.lon)),
+      type.burnPerKm * windBurnFactor(w.windKt, w.windDirDeg, initialBearingDeg(from.lat, from.lon, to.lat, to.lon)) * conditionBurnMultiplier(p.health),
       type.emptyWeightKg,
       type.maxFuel,
       distanceKm,
       1,
     );
 
+    // Wear (v0.39.0, ISS-069): health drops by WEAR_PER_KM per km of this landed leg, clamped at 0.
+    const newHealth = Math.max(0, p.health - WEAR_PER_KM * distanceKm);
+
     // Deliver every bound package whose destination is the airport just reached —
     // runs whether or not a queued leg chains next (ISS-043).
     const onBoard = packageRows.filter((pk) => pk.planeId === p.id && pk.destIcao === to.icao);
@@ -203,10 +228,12 @@ export async function deliverPackages(inst: GameDb, clockMs: number): Promise<nu
       const nextDest = queue[0];
       const next = byIcao.get(nextDest); // unknown ICAO in the queue → cannot chain
       if (next) {
-        // Wind-adjusted requirement for the NEXT leg — it departs from `to` (v0.36.0).
+        // Wind-adjusted requirement for the NEXT leg — it departs from `to` (v0.36.0). v0.39.0 (ISS-069):
+        // the chained leg starts AFTER this landing's wear, so its burn uses newHealth — exactly what
+        // livePlane()/the next landing will compute for that flight.
         const wNext = weatherFor(to.icao);
         const nextRequiredL = requiredFuelFor(
-          type.burnPerKm * windBurnFactor(wNext.windKt, wNext.windDirDeg, initialBearingDeg(to.lat, to.lon, next.lat, next.lon)),
+          type.burnPerKm * windBurnFactor(wNext.windKt, wNext.windDirDeg, initialBearingDeg(to.lat, to.lon, next.lat, next.lon)) * conditionBurnMultiplier(newHealth),
           type.emptyWeightKg,
           type.maxFuel,
           haversineKm(to.lat, to.lon, next.lat, next.lon),
@@ -226,6 +253,7 @@ export async function deliverPackages(inst: GameDb, clockMs: number): Promise<nu
               lat: to.lat,
               lon: to.lon,
               fuel: landedFuel,
+              health: newHealth, // v0.39.0 (ISS-069) — this leg's wear persists into the chained flight
               destIcao: chainedTo,
               departureSimTime: clockMs, // the arrival instant — position is exactly `to`
               queue: JSON.stringify(queue),
@@ -236,6 +264,7 @@ export async function deliverPackages(inst: GameDb, clockMs: number): Promise<nu
               lat: to.lat,
               lon: to.lon,
               fuel: landedFuel,
+              health: newHealth, // v0.39.0 (ISS-069) — this leg's wear persists on the grounded plane
               departureSimTime: null,
               destIcao: null,
               queue: JSON.stringify(queue),
diff --git a/package.json b/package.json
index 14c9958..5b6d2cc 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "flight-ops",
-  "version": "0.38.0",
+  "version": "0.39.0",
   "private": true,
   "scripts": {
     "dev": "next dev -p 3000",