# SDR AALA202608174992

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 13, 2026
- Submitted: August 18, 2026
- Operation: Air carrier
- Aircraft: [N850NN](https://openairdocs.org/aircraft/N850NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 40580
- Aircraft time: 47,636 hours, 20,365 cycles
- System (JASC): [2612 · Fire Detection](https://openairdocs.org/jasc/2612)
- Part: Fire Detector
- Part number: 90286201
- Condition: Faulty
- Location: Zone 400
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202608174992

## Discrepancy

AIRCRAFT WAS GROUNDED: DURING CLIMB OUT NUMBER ONE ENGINE OVERHEAT LIGHT ILLUMINATED. AIRCRAFT HAS MULTIPLE MEL'S CONCERNING THE OVERHEAT/FIRE DETECTION SYSTEM.  RAN SYSTEM TEST AND NO FAULTS WERE DETECTED. DURING CHECKLIST EXECUTION, AFTER RETARDING THE THRUST LEVER, THE OVERHEAT LIGHT EXTINGUISHED. DECESION MADE TO RETURN TO PHX AS A PRECAUTION AN EMERGENCY WAS DECLARED AND AIRCRAFT LANDED OVERWEIGHT WITHOUT INCIDENT. MAINTENANCE REPLACED ENG APU FIRE MODULE PER AMM TASK 26-10-01-400-8-01.

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