# SDR DALA2025112008488

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 12, 2025
- Submitted: November 20, 2025
- Operation: Air carrier
- Aircraft: [N536DN](https://openairdocs.org/aircraft/N536DN), 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: 11426
- Aircraft time: 10,489 hours, 2,568 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: CL
- How discovered: O
- Nature of condition: B
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DALA2025112008488

## Discrepancy

ATB/FUME - RETURNED TO JFK DUE TO ODOR IN CABIN.   P-TRAK SNIFFER RESULTS INDICATE APU AS SOURCE OF THE ODOR. COMPLETED LEVEL B ECS DECONTAMINATION. DEFERRED APU PER MEL 49-10-01A. LATER, COMPLIED WITH CLEAN APU AIR INTAKE AND COMPARTMENT PER WORK CAR 4916-2001. NO LEAK FOUND, PERFORMED P-TRACK TEST, NO ABNORMAL ODORS. (LP 7360328, 7360336)

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