# SDR AALA202112017825

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 30, 2021
- Submitted: December 1, 2021
- Operation: Air carrier
- Aircraft: [N104UW](https://openairdocs.org/aircraft/N104UW), registered now
- Make and model: Airbus A320-214
- Registry model: [Airbus A320-214](https://openairdocs.org/model/airbus-a320-214) (OpenAirDocs)
- Aircraft serial: 863
- Aircraft time: 58,975 hours, 34,415 cycles
- System (JASC): [4900 · Airborne Auxiliary Power Unit (APU) System](https://openairdocs.org/jasc/4900)
- Part: Apu
- Part number: 38007081
- Part serial: P4142
- Condition: Odor
- Location: Zone 100
- Part time: 30,755 hours, 16,903 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/AALA202112017825

## Discrepancy

AIRCRAFT WAS GROUNDED: DIRTY SOCK SMELL IN FLIGHT DECK  ESPECIALLY WITH ENGINES AT IDLE DURING DESCENT TRIED TURNING NUMBER 2 BLEED OFF NO REAL CHANGE. MAINTENANCE HAS ISOLATED TO THE SOURCE OF THE ODOR TO THE APU.   (OPEN)

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