# SDR AALA202211298423

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 27, 2022
- Submitted: November 29, 2022
- Operation: Air carrier
- Aircraft: [N578UW](https://openairdocs.org/aircraft/N578UW), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 6035
- Aircraft time: 27,594 hours, 11,142 cycles
- System (JASC): [4900 · Airborne Auxiliary Power Unit (APU) System](https://openairdocs.org/jasc/4900)
- Part: Apr
- Part number: 38007081
- Part serial: P4927
- Condition: Odor
- Part time: 34,493 hours, 13,341 cycles
- Stage of operation: TO
- 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/AALA202211298423

## Discrepancy

AIRCRAFT WAS GROUNDED: ACRID SMELL NOTED AT GATE. ODOR RE-OCCURRED BRIEFLY ON DEPARTURE ROLL AND DURING DESCENT. MAINTENANCE ISOLATED THE SOURCE OF THE ODOR TO THE APU.  (OPEN)

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