# SDR CALA2026032314733

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 19, 2026
- Submitted: March 23, 2026
- Operation: Air carrier
- Aircraft: [N840UA](https://openairdocs.org/aircraft/N840UA), registered now
- Make and model: Airbus A319-131
- Registry model: [Airbus A319-131](https://openairdocs.org/model/airbus-industrie-a319-131) (OpenAirDocs)
- Aircraft serial: 1522
- Aircraft time: 69,638 hours, 30,937 cycles
- System (JASC): [4920 · APU Core Engine](https://openairdocs.org/jasc/4920)
- Part: Apu
- Part number: 4500001B
- Part serial: 1981
- Condition: Faulted
- Location: Zone 100
- Part time: 31,936 hours, 39,455 cycles
- Stage of operation: IN
- How discovered: V
- Nature of condition: B
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026032314733

## Discrepancy

SMOKE FUME EVENT DURING ENGINE 1 START AFT CABIN WAS BAD FLT DEC K HAD FUMES TOO.  INSPECTED APU IAW TASK 49-00-00-200-816-A, FOUND SMOKE AND OIL RESIDUE IN THE COMPARTMENT.  REMOVED HEAT SHIELD AROUND THE AFT TURBINE SECTION FOUND UPPER & LOWER LUBRICATION LINES SEEPING OIL. CLEANED BURNT RESIDUE AND REINSTALLED SHIELD. SUSPECT OIL THAT LEAKED WENT INTO APU INLET WHICH SMOKED THE CABIN.  NO LEAKS WITH APU NOT IN OPS.   APPROVED FOR MEL 4910B PLACED APU ON MEL 4910B AND DEACTIVATED.  INSTALLED STICKER NEXT TO START SWITCH AND PULLED BREAKERS.  REMOVED APU REF AMM 49-11-98-890-C1.  UP TO STEP J GETTING READY FOR APU INSTALLATION

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