# SDR AALA202606082338

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 7, 2026
- Submitted: June 8, 2026
- Operation: Air carrier
- Aircraft: [N904AA](https://openairdocs.org/aircraft/N904AA), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 7613
- Aircraft time: 28,049 hours, 11,138 cycles
- System (JASC): [4990 · APU Oil System](https://openairdocs.org/jasc/4990)
- Part: Module
- Part number: 41310204
- Part serial: 4537
- Condition: Leaking
- Location: Apu Oil
- Part time: 5,013 hours, 2,072 cycles
- Component: Apu, Hnywl, 1319A
- Component part number: 38007081
- Stage of operation: CL
- How discovered: O
- Nature of condition: B
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202606082338

## Discrepancy

AIRCRAFT WAS GROUNDED: INBOUND CABIN CREW REPORTED A DIRTY SOCK / ROTTEN EGG SMELL ON DEPARTURE AND ARRIVAL BELOW 10K FEET.  MAINTENANCE FOUND THE APU OIL LUBE MODULE LEAKING AND REPLACED IT PER AMM 49-91-45. A DECONTAMINATION OF THE ENVIRONMENTAL CONTROL SYSTEM WAS ACCOMPLISHED PER TASK CARD 26L00021014 ALONG WITH A SATISFACTORY OPS & LEAK CHECK WITH NO ODORS NOTED.

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