# SDR CALA2026050115910

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 30, 2026
- Submitted: May 1, 2026
- Operation: Air carrier
- Aircraft: [N17594](https://openairdocs.org/aircraft/N17594), registered now
- Make and model: Boeing 737-9
- Registry model: [Boeing 737-9](https://openairdocs.org/model/boeing-737-9) (OpenAirDocs)
- Aircraft serial: 43447
- Aircraft time: 3,432 hours, 1,130 cycles
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Filter
- Part number: P199753
- Condition: Clogged
- 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/CALA2026050115910

## Discrepancy

FA REPORTED ODOR OF  FUMES AFTER ENG STAR AND 10K FT ON DES.   PERFORMED CONDITIONAL INSPECTION AMM 05-51-56-200-801 NO SMOKE OR FUMES DETECTED, FOLLOWED FIM 21 -00 TASK 830 WITH FLIGHT CREW ASSISTANCE ENGINE 1/2 RAN COULD DUPLICATE THE ODOR ON START UP BUT ODOR WOULD DISSIPATED. CONFIRMED ODOR IS NOT PRESENT WITH APU ONLY. INSPECTED RECIRCULATION FILTERS AND FOUND EXTREMELY DIRTY. FILTERS WILL NEED REPLACEMENT AND ENGINES NEED TO BE RAN FOR CONFIRMATION.  R & R BOTH RECIRCULATION FILTERS IAW AMM 21-25-01.

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