# SDR AALA202606226946

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 20, 2026
- Submitted: June 22, 2026
- Operation: Air carrier
- Aircraft: [N903NN](https://openairdocs.org/aircraft/N903NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 31153
- Aircraft time: 40,044 hours, 17,260 cycles
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Air Filter
- Condition: Dirty
- Location: Zone 100
- 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/AALA202606226946

## Discrepancy

AIRCRAFT WAS GROUNDED: NOTICED MUSTY SMELL AFTER TAKEOFF AT APPROXIMATELY 1000 FT. PREVIOUSLY WRITTEN UP. LASTED APPROXIMATELY 5 SECONDS THEN BEGAN DISSIPATING OVER THE NEXT MINUTE OR SO. MAINTENANCE FOUND RECIRC FILTERS VERY DIRTY AND REPLACED IAW AMM 21-25-01.

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