# SDR CALA2025090508497

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 4, 2025
- Submitted: September 5, 2025
- Operation: Air carrier
- Aircraft: [N87513](https://openairdocs.org/aircraft/N87513), registered now
- Make and model: Boeing 737824
- Aircraft serial: 31621
- Aircraft time: 54,351 hours, 19,409 cycles
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Unknown
- Condition: Odor
- Location: Cabin
- Stage of operation: CL
- 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/CALA2025090508497

## Discrepancy

BAD SMELL COMING FROM CONDITIONED AIR DEBRIEDED CREW ON ARRIVAL, CREW REPORTED ODOR OF SMELLY DIRTY SOCKS, IN THE FLIGHT DECK AND CABIN DURING TAKEOFF AND CLIMBOUT, THEN WENT AWAY DURING CRUISE BUT RETURNED ON DESCENT.  ACCOMPLISHED HIGH POWER RUN, CYCLED A/C PACKS, NO ODOR DETECTED.  REPLACED BOTH LEFT AND RIGHT RECIRCULATION AIR FILTER  IAW TASK 21-25-01/401.

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