# SDR AALA202405263157

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 19, 2024
- Submitted: May 26, 2024
- Operation: Air carrier
- Aircraft: [N534UW](https://openairdocs.org/aircraft/N534UW), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 3989
- Aircraft time: 50,080 hours, 18,975 cycles
- System (JASC): [4900 · Airborne Auxiliary Power Unit (APU) System](https://openairdocs.org/jasc/4900)
- Part: Carbon Seal
- Part number: 38631041
- Condition: Leaking
- Location: Separator
- Stage of operation: DE
- How discovered: 9
- Nature of condition: B
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202405263157

## Discrepancy

AIRCRAFT WAS GROUNDED: FLIGHT CREW STRONG DIRTY SOCK ODOR IN FLIGHT DECK DURING DECENT THROUGH 10,000 FEET.  MAINTENANCE REPLACED THE APU GEARBOX VENT TUBE DUE TO COKING, REPLACED THE AIR/OIL SEPERATOR CARBON SEAL (AALA202405263157) AND THE APU OIL COOLING FAN SHAFT O-RING (AALA202405265159). A SATISFACTORY LEAK / OPERATIONAL CHECK WAS ACCOMPLISHED.

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