# SDR AALA2019030869011

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 5, 2019
- Submitted: March 26, 2019
- Operation: Air carrier
- Aircraft: [N508AY](https://openairdocs.org/aircraft/N508AY), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 3740
- Aircraft time: 36,971 hours, 13,086 cycles
- System (JASC): [4900 · Airborne Auxiliary Power Unit (APU) System](https://openairdocs.org/jasc/4900)
- Part: Apu
- Part number: 38007081WGEN
- Condition: Leaking
- Location: 000
- Part time: 28,315 hours, 15,869 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/AALA2019030869011

## Discrepancy

THE PILOT REPORTED THERE WAS A DIRTY SOCK ODOR, WHILE DESCENDING THROUGH 10,000FT.  THE ODOR DIMINISHED AFTER 5 MINUTES, & THEN REOCCURED AFTER CONFIGURED FOR LANDING.  MAINTENANCE ACCOMPLISHED CARD 26L00021001 & 26L00021002 AND DETERMINED THAT THE APU HAD AN INTERNAL LEAKAGE CAUSING THE SOURCE OF THE ODOR.   REMOVED AND REPLACED THE APU.

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