# SDR AALA201710109001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 7, 2017
- Submitted: October 10, 2017
- Operation: Air carrier
- Aircraft: [N972NN](https://openairdocs.org/aircraft/N972NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 33334
- Aircraft time: 7,629 hours, 3,008 cycles
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Filter
- Part number: P199753
- Condition: Dirty
- Location: Recirculation
- 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/AALA201710109001

## Discrepancy

STRONG DIRTY SOCK ODOR NOTICED IN THE COCKPIT WHILE DESCENDING FROM 9000 TO 4000 FT.  REMOVED AND REPLACED THE FOULED CABIN RECIRCULATION FILTERS IAW AMM 21-25-01.  OPS CHECKED GOOD.

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