# SDR AALA202604292691

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 28, 2026
- Submitted: April 29, 2026
- Operation: Air carrier
- Aircraft: [N969AN](https://openairdocs.org/aircraft/N969AN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 29546
- Aircraft time: 69,416 hours, 29,390 cycles
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Air Filter
- Condition: Contaminated
- Location: Zone 100
- 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/AALA202604292691

## Discrepancy

AIRCRAFT WAS GROUNDED: REPEAT WRITE UP: MUSTY ODOR DURING CLIMB THROUGH FL290. ACCOMPLISHED J/C 08L00021001, PREVIOUS SHIFT FOUND OIL STILL LEAKING FROM APU INTO BLEED VALVE, WHICH IS CAUSING INGESTION INTOPACKS WHEN APU IS ON. CHANGED RECIRCULATION FILTERS. PER AMM 21-25-01.

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