# SDR SWAA2026082106267

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 1, 2026
- Submitted: August 22, 2026
- Operation: Air carrier
- Aircraft: [N8643A](https://openairdocs.org/aircraft/N8643A), registered now
- Make and model: Boeing 737-8H4
- Registry model: [Boeing 737-8H4](https://openairdocs.org/model/boeing-737-8h4) (OpenAirDocs)
- Aircraft serial: 42524
- Aircraft time: 39,781 hours, 19,352 cycles
- System (JASC): [2613 · Overheat Detection](https://openairdocs.org/jasc/2613)
- Part: Overheat Loop
- Condition: False Indication
- Location: Zone 100
- Stage of operation: NR
- 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/SWAA2026082106267

## Discrepancy

LEFT WING BODY OVERHEAT LIGHT ILLUMINATED AFTER NR 2 ENGINE START, WITH APU BLEED SWITCH ON.   BITE SHOWS CODE 44 WITH ALARM LIGHT ILLUMINATED.    CHECKED AFT CARGO,  FOUND FULLY LOADED.  UNABLE TO CHECK FOR HOT AREAS. TROUBLESHOT IAW FIM 26-18 TASK 802, AND 815.  VERIFIED FAULT CODE 44.  CONNECTED OVERHEAT DETECTION MODULE TEST EQUIPMENT AND CHECKED VOLTAGE & RESISTANCE TO THE AFT CARGO SECTION 46 WITH BLEEDS ON & OFF ALL WITHIN LIMITS. OPS APU BLEEDS & LT PACK FOR OVER AN HOUR & CHECKED AFT CARGO BAY FOR BLEED LEAKS,  NO DEFECTS NOTED. SUSPECTED EXTREME HOT WEATHER IN PHOENIX TRIGGERED THE FAULT. OPS CHECKED GOOD IAW AMM 26-18-00.

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