# SDR CALA2026061817168

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 17, 2026
- Submitted: June 18, 2026
- Operation: Air carrier
- Aircraft: [N77538](https://openairdocs.org/aircraft/N77538), registered now
- Make and model: Boeing 737824
- Aircraft serial: 63694
- Aircraft time: 29,407 hours, 11,191 cycles
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Filter
- Part number: 21FA407G
- Condition: Odor
- Location: Zone 100
- 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/CALA2026061817168

## Discrepancy

DESCENDING THRU 12000 FT  A/C STARTED SMELLING   LIKE DIRTY SOCK S PHOTO UPDATE.. CREW INFORMED THAT SMELL DISSAPATED AFTER 5 MINUTES. UPDATED. PARTS. INFORMATION PLEASE REPLACE RECIRC FILTERS UNLOCKING FOR SIGN OFF REMOVED AND REPLACED BOTH LEFT AND RIGHT RECIRCULATION FILTERS REF AMM 21-25-01 RAN BOTH PACKS WITH APU AND ENGINE BLEEDS NO SMELL NOTED AT THIS TIME.

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