# SDR CALA2025092809343

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 27, 2025
- Submitted: September 29, 2025
- Operation: Air carrier
- Aircraft: [N37273](https://openairdocs.org/aircraft/N37273), registered now
- Make and model: Boeing 737824
- Aircraft serial: 31591
- Aircraft time: 73,810 hours, 26,419 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: A/C Pack
- Condition: Contaminated
- Location: Zone 100
- Stage of operation: NR
- 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/CALA2025092809343

## Discrepancy

ACRID BURNING SMELL FROM AIR VENTS DURING CLIMB-FL350 AND DESCENT -7000 LASTING 5 MIN EACH . FLIGHT DECK & FWD GALLEY HAS A UNIQUE ODOR, SMELL DISAPATES BEYOND FIRST CLASS. FOB 30.6 AT THE GATE. REF AMM 05-51-26.   FOUND RECIRCULATION AIR FILTERS DIRTY. AS PRECAUTION REMOVED AND REPLACED BOTH RECIRCULATION FILTERS REF. AMM 21-25-01/401.  FOUND CIC AROUND OUTER EGDGES OF PACK BY PANELS.  CLEANED RESIDUAL CIC COMPOUND AND PERFORMED BURN OUT IAW MM 05-51-26.  NO FOUL ODORS PRESENT AT THIS TIME.

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