# SDR SWAA2026060809489

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 4, 2026
- Submitted: June 9, 2026
- Operation: Air carrier
- Aircraft: [N453WN](https://openairdocs.org/aircraft/N453WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 29847
- Aircraft time: 62,569 hours, 34,681 cycles
- System (JASC): [2612 · Fire Detection](https://openairdocs.org/jasc/2612)
- Part: Fire Detector
- Condition: Overheated
- Location: Nr 1 Engine
- Stage of operation: TX
- How discovered: O
- Nature of condition: M, J
- Precautionary procedure: D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWAA2026060809489

## Discrepancy

NR 1 ENG OVERHEAT DURING START UP.   REMOVED AND REPLACED NR 1 ENGINE FAN LOWER FIRE DETECTOR ASSEMBLY IAW AMM 26-11-01. NO HELP.   REMOVED AND REPLACED NR 1 ENGINE FAN UPPER FIRE DETECTOR IAW AMM 26-11-01. OPS CHKD GOOD.

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