# SDR DALA2025101607572

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 16, 2025
- Submitted: October 16, 2025
- Operation: Air carrier
- Aircraft: [N381DZ](https://openairdocs.org/aircraft/N381DZ), registered now
- Make and model: Airbus A321-211
- Registry model: [Airbus A321-211](https://openairdocs.org/model/airbus-a321-211) (OpenAirDocs)
- Aircraft serial: 8859
- Aircraft time: 20,760 hours, 8,908 cycles
- System (JASC): [4900 · Airborne Auxiliary Power Unit (APU) System](https://openairdocs.org/jasc/4900)
- Part: Apu
- Condition: Odor
- Location: Zone 100
- Stage of operation: IN
- How discovered: V
- Nature of condition: B
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DALA2025101607572

## Discrepancy

MUSTY ODOR ON FLIGHT DECK AS WE DESCENDED TO 4000' MIL. SEEMED TO GO AWAY BUT RETURNED AFTER LANDING.    REPLACED APU. (LP 7781910, 1252891)

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