# SDR SWAA2026090918056

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 9, 2026
- Submitted: September 10, 2026
- Operation: Air carrier
- Aircraft: [N8630B](https://openairdocs.org/aircraft/N8630B), registered now
- Make and model: Boeing 737-8H4
- Registry model: [Boeing 737-8H4](https://openairdocs.org/model/boeing-737-8h4) (OpenAirDocs)
- Aircraft serial: 42521
- Aircraft time: 37,949 hours, 18,464 cycles
- System (JASC): [2613 · Overheat Detection](https://openairdocs.org/jasc/2613)
- Part: Overheat Sensor
- Condition: False Activation
- Location: Nr 1 Engine
- Stage of operation: CL
- How discovered: O
- Nature of condition: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWAA2026090918056

## Discrepancy

NR 1 ENGINE OVERHEAT LIGHT CAME ON,  STARTED QRH & THEN WENT OUT.  PERFORMED FIM 26-10 TASK 811. NO DEFECTS FOUND AT THIS TIME. PERFORMED ENGINE FIRE DETECTION LOOP RESISTANCE CHECK. FOUND TO BE WITHIN LIMITS IAW AMM 26-11-00.  REMOVED AND REPLACED UPPER FAN FIRE DETECTOR AS A PRECAUTION IAW AMM 26-11-01. OPS CHECKED GOOD. REF TTG8Q01E75GW FOR NR 1 ENG HIGH POWER RUN

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