# SDR AALA202602091980

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 29, 2026
- Submitted: February 9, 2026
- Operation: Air carrier
- Aircraft: [N957XV](https://openairdocs.org/aircraft/N957XV), registered now
- Make and model: Airbus A321-253N
- Registry model: [Airbus A321-253N](https://openairdocs.org/model/airbus-a321-253n) (OpenAirDocs)
- Aircraft serial: 8246
- Aircraft time: 22,210 hours, 6,201 cycles
- System (JASC): [4990 · APU Oil System](https://openairdocs.org/jasc/4990)
- Part: Separator
- Condition: Leaking
- Location: Air Oil
- Component: Apu, Hnywl, 1319A
- Component part number: 38007081
- Stage of operation: DE
- How discovered: O
- Nature of condition: K, B
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202602091980

## Discrepancy

AIRCRAFT WAS GROUNDED: MUSTY SOCK SMELL IN DESCENT TO WARM MOIST CLIMATE AT AUA. FLIGHT CREW REPORTED IT SMELLED STRONG IN CABIN SEAT 4C AND VERY STRONG FROM FLIGHT DECK OVERHEAD VENTS. **ORIGINAL REPORT WAS AALA202602024344 SUBMITTED 2/2/26 BY TUL** MAINTENANCE REPLACED THE APU GEARBOX VENT LINE PER AMM 49-26-55 AND THE AIR-OIL SEPARATOR SEALS PER AMM 49-26-54. (AALA202602091980) A SATISFACTORY OPERATIONAL / LEAK CHECK WAS ACCOMPLISHED WITH NO ODORS NOTED.

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