# SDR AALA202602094344

- 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: Vent Line
- Condition: Clogged
- Location: Zone 100
- 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/AALA202602094344

## 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.  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. ** (CLOSED)

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