# SDR F3LA202512230338

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 22, 2025
- Submitted: December 23, 2025
- Operation: Air carrier
- Aircraft: [N641FR](https://openairdocs.org/aircraft/N641FR), registered now
- Make and model: Airbus A321-271NX
- Registry model: [Airbus A321-271NX](https://openairdocs.org/model/airbus-s-a-s-a321-271nx) (OpenAirDocs)
- Aircraft serial: 11887
- Aircraft time: 5,427 hours, 2,500 cycles
- System (JASC): [4900 · Airborne Auxiliary Power Unit (APU) System](https://openairdocs.org/jasc/4900)
- Part: Apu
- Part number: 38007081
- Part serial: P11003
- Condition: Odor
- Location: Zone 200
- Part time: 3,545 hours, 663 cycles
- Stage of operation: DE
- 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/F3LA202512230338

## Discrepancy

ODOR EVENT IN THE DECENT PASSING 8000FT,  ODOR ONLY IN-FLIGHT DECK.  AIRCRAFT REMOVED FROM SERVICE FOR THIS EVENT.   PERFORMED TSM 05-50-000-810-836-A FOUND SOURCE OF FUME TO BE APU.  IAW AMM 49-00-00-860-214-A, INSPECTED AND CLEANED AREA NO DEFECTS NOTED.   FOUND APU TO BE SOURCE OF THE FUME EVENT PLACED ON MEL 49-10-01A C/N 1241035 DD 01/01/2026 WITH MCC RAH 428023. PLACARDS INSTALLED.

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