# SDR USAA2011101700012

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 14, 2011
- Submitted: October 17, 2011
- Operation: Air carrier
- Aircraft: N332AW
- Make and model: Boeing 737-3B7
- Registry model: [Boeing 737-3B7](https://openairdocs.org/model/boeing-737-3b7) (OpenAirDocs)
- Aircraft serial: 23384
- Aircraft time: 71,464 hours, 42,032 cycles
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Filter
- Condition: Dirty
- Location: Cabin
- Stage of operation: DE
- 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/USAA2011101700012

## Discrepancy

CREW REPORTED THE PACKS EMIT AN ACRID DIRTY SOCK SMELL ON DESCENT.  MAINTENANCE ACCOMPLISHED TROUBLESHOOTING JOB CARDS 03L00021001 AND 03L00036001.  REPLACED BOTH COALESCER BAGS IAW AMM 21-51-41-400.  REPLACED THE RECIRCULATION HEPA FILTER PER AMM 21-21-23. RAN BOTH ENGINES AND APU WITH BOTH PACKS.  NO ODORS AT THIS TIME.

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