# SDR SWAA2025102728097

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 24, 2025
- Submitted: October 27, 2025
- Operation: Air carrier
- Aircraft: [N1803U](https://openairdocs.org/aircraft/N1803U), registered now
- Make and model: Boeing 737-8
- Registry model: [Boeing 737-8](https://openairdocs.org/model/boeing-737-8) (OpenAirDocs)
- Aircraft serial: 60226
- Aircraft time: 9,320 hours, 4,812 cycles
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Air Filter
- Condition: Odor
- Location: Zone 100
- Stage of operation: AP
- 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/SWAA2025102728097

## Discrepancy

ON ROTATION BURNING SMELL IN COCKPIT AND CABIN; SMELL DISSIPATED IN COCKPIT BUT REMAINED IN CABIN ALL ENGINE INDICATIONS NORMAL. SMELL RETURNED IN CABIN ON APPROACH.   PER AMM 05-51-56-201-MAX (SMOKE OR FUMES IN CABIN - MAINTENANCE PRACTICES (CONDITIONAL INSPECTION) PERFORMED FIM TASK 21-00-00-810-830.  NO FUMES NOTED IN THE CABIN. ENGINE PARAMETERS NORMAL. REMOVED AND REPLACED RT RECRCULATION AIR FILTER IAW AMM 21-25-01.

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