# SDR AALA202212023235

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 11, 2022
- Submitted: December 2, 2022
- Operation: Air carrier
- Aircraft: [N151AN](https://openairdocs.org/aircraft/N151AN), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 6840
- Aircraft time: 20,964 hours, 8,155 cycles
- System (JASC): [4900 · Airborne Auxiliary Power Unit (APU) System](https://openairdocs.org/jasc/4900)
- Part: Apu
- Part number: 38007081
- Part serial: P6417
- Condition: Contaminated
- Stage of operation: AP
- How discovered: O
- Nature of condition: C, B
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202212023235

## Discrepancy

AIRCRAFT WAS GROUNDED: DIRTY SOCK ODOR ON TAXI OUT APPROACH AND LANDING. DID NOT OBSERVE ODOR IN CRUISE. MAINTENANCE ISOLATED THE SOURCE OF THE ODOR TO THE APU.  MAINTENANCE ACCOMPLISHED APU SMOKE/ODOR/FUME TROUBLESHOOTING TASK CARD 26L00021002 WITH NO ACTIVE LEAKS BEING NOTED. HOWEVER, MAINTENANCE NOTICED A BUILD UP OF CONTAMINATES IN THE APU PLENUM ELBOW AND CLEANED THE APU AIR INTAKE PER TASK CARD 26T31049006 ALONG WITH CLEANING THE APU COMPARTMENT PER AMM 49-00-00-100-03-A. THE ENVIRONMENTAL CONTROL SYSTEM WAS DECONTAMINATED PER TASK CARD 26L00021004. A SATISFACTORY LEAK OPERATIONAL CHECK WAS ACCOMPLISHED WITH NO LEAKS OR ODROS BEING NOTED.

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