# SDR AALA202209073417

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 31, 2022
- Submitted: September 7, 2022
- Operation: Air carrier
- Aircraft: [N779AN](https://openairdocs.org/aircraft/N779AN), registered now
- Make and model: Boeing 777
- Aircraft serial: 29955
- Aircraft time: 91,759 hours, 11,213 cycles
- System (JASC): [4990 · APU Oil System](https://openairdocs.org/jasc/4990)
- Part: Apu
- Part number: 351W30004
- Part serial: P1392
- Condition: Leaking
- Location: Zone 200 - Fuse
- Part time: 36,396 hours, 8,111 cycles
- Stage of operation: DE
- How discovered: O
- Nature of condition: B
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202209073417

## Discrepancy

AIRCRAFT WAS GROUNDED: PILOT REPORTS OF ODOR ON DESCENT OF A MUSTY ODOR. DURING TROUBLESHOOTING, IT WAS DISCOVERED THAT APU WAS LEAKING OIL. REMOVED AND REPLACED APU. **SUPPLEMENTAL REPORT FOR AALA202209013417: APU REPLACED.** (CLOSED)

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