# SDR USAA2012012300028

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 20, 2012
- Submitted: January 23, 2012
- Operation: Air carrier
- Aircraft: N450UW
- Make and model: Boeing 737-4B7
- Registry model: [Boeing 737-4B7](https://openairdocs.org/model/boeing-737-4b7) (OpenAirDocs)
- Aircraft serial: 24933
- Aircraft time: 56,636 hours, 37,327 cycles
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Unknown
- Condition: Odor
- 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/USAA2012012300028

## Discrepancy

DURING DESCENT, THROUGH 10.000 FEET, CREW REPORTED A CABIN AIR ODOR LIKE SOUR MILK THAT BECAME VERY STRONG, IT LASTED UNTIL TOUCHDOWN.  MAINTENANCE ACCOMPLISHED J/C 03L00021001, 737 CABIN ODOR TROUBLESHOOT CARD.

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