# SDR AALA202507098827

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 27, 2025
- Submitted: July 9, 2025
- Operation: Air carrier
- Aircraft: [N164NN](https://openairdocs.org/aircraft/N164NN), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 6909
- Aircraft time: 27,752 hours, 11,003 cycles
- System (JASC): [4990 · APU Oil System](https://openairdocs.org/jasc/4990)
- Part: Oil System
- Condition: Leaking
- Location: Apu
- Component: Apu, Hnywl
- Component part number: 38007081
- Stage of operation: CL
- 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/AALA202507098827

## Discrepancy

AIRCRAFT WAS GROUNDED: ODOR IN CABIN AND FLIGHT DECK ON TAXI OUT AND IN CLIMB, MUSTY/DIRTY SOCK SMELL.   MAINTENANCE FOUND THE APU LEAKING OIL AND REPLACED IT PER TASK CARD 26L31049003. A DECONTAMINATION OF THE ENVIRONMENTAL CONTROL SYSTEM WAS ACCOMPLISHED PER TASK CARD 26L00021014. A SATISFACTORY LEAK / OPERATIONAL CHECK WAS ACCOMPLISHED WITH NO ODORS NOTED.

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