# SDR USAA2011072900007

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 28, 2011
- Submitted: July 29, 2011
- Operation: Air carrier
- Aircraft: N426US
- Make and model: Boeing 737-4B7
- Registry model: [Boeing 737-4B7](https://openairdocs.org/model/boeing-737-4b7) (OpenAirDocs)
- Aircraft serial: 24548
- Aircraft time: 59,131 hours, 39,687 cycles
- System (JASC): [4970 · APU Indicating System](https://openairdocs.org/jasc/4970)
- Part: Tach Generator
- Part number: 2CM9ABH7
- Part serial: W23986
- Condition: Leaking
- Location: Apu
- Part time: 83,538 hours, 63,717 cycles
- Stage of operation: DE
- How discovered: O
- Nature of condition: K, B
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/USAA2011072900007

## Discrepancy

ON DESCENT INTO CLT, CREW REPORTED THE AIR CONDITION SYSTEM STARTING STINKING, IT SMELLS LIKE A DIRTY SOCK.  MAINTENANCE ACCOMPLISHED J/C 03L00021001.  FOUND APU TACH GEN LEAKING OIL.  REMOVED AND REPLACED SAME PER 49-61-61.  ALSO, ENGINE BOROSCOPE FOUND NO OIL STREAKING OR DEFECTS.

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