# SDR AALA202111010609

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 28, 2021
- Submitted: November 1, 2021
- Operation: Air carrier
- Aircraft: [N122NN](https://openairdocs.org/aircraft/N122NN), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 6252
- Aircraft time: 23,268 hours, 6,786 cycles
- System (JASC): [4900 · Airborne Auxiliary Power Unit (APU) System](https://openairdocs.org/jasc/4900)
- Part: Apu
- Part number: 38007081
- Part serial: P5941
- Condition: Odor
- Location: Zone 100
- Stage of operation: CL
- How discovered: O
- Nature of condition: B
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202111010609

## Discrepancy

AIRCRAFT WAS GROUNDED: FUME EVENT OCCURRED PASSING FL 180 250 KNOTS AND CONTINUED TO 12,000. SEEMED TO CLEAR BUT STARTED AGAIN ON DESCENT TO LANDING. MAINTENANCE ISOLATED SOURCE OF ODOR TO THE APU.   (OPEN)

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