# SDR AALA202108274847

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 25, 2021
- Submitted: August 27, 2021
- Operation: Air carrier
- Aircraft: [N846NN](https://openairdocs.org/aircraft/N846NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 31101
- Aircraft time: 33,721 hours, 13,951 cycles
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Air Filter
- Condition: Dirty
- Location: Cabin Air
- Stage of operation: DE
- How discovered: O
- Nature of condition: B
- Precautionary procedure: H
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202108274847

## Discrepancy

AIRCRAFT WAS GROUNDED: DURING DESCENT, MUSTY SMELL IN FLIGHT DECK; ODOR DISSIPATED WITH LH RECIRCULATION FAN DEACTIVATED. REPLACED RECIRCULATION FAN AIR FILTER IAW AMM 21-25-01, OPS CHECK GOOD.

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