# SDR 2020F00116

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 22, 2019
- Submitted: December 2, 2019
- Operation: General aviation
- Aircraft: N309AN
- Make and model: Boeing 737-3Q8
- Registry model: [Boeing 737-3Q8](https://openairdocs.org/model/boeing-737-3q8) (OpenAirDocs)
- Aircraft serial: 26309
- System (JASC): [7500 · Engine Bleed Air System](https://openairdocs.org/jasc/7500)
- Part: Thermostat
- Part number: 1296662
- Part serial: 6658
- Condition: Failed
- Location: Bleed System
- Stage of operation: CR
- How discovered: O
- Nature of condition: S
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2020F00116

## Discrepancy

BLEED TRIP OFF STAY LIGHT ILLUMINATED AFTER PROCEDURE DONE. QRF TO DEPARTURE AIRPORT. CORRECTIVE ACTION: THE 450F THERMOSTAT WAS REPLACED IAW AMM 36-12-55/401.

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