# SDR ASAA2022092940120

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 29, 2022
- Submitted: October 3, 2022
- Operation: Air carrier
- Aircraft: [N431AS](https://openairdocs.org/aircraft/N431AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 43255
- Aircraft time: 33,135 hours, 10,509 cycles
- System (JASC): [2230 · Auto Throttle System](https://openairdocs.org/jasc/2230)
- Part: Autothrottle Sys
- Condition: Failed
- Stage of operation: NR
- How discovered: V
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2022092940120

## Discrepancy

AUTO THROTTLES STOPPED WORKING AND WOULD NOT RE-ENGAGE. GROUNDED - YES.  A/T INFLT FAULTS SHOWED NO A/T FAULTS LAST 22 LEGS. LEG 23 HAD ASM 2 RATE MONITOR FAULT. PERFORMED B737-900 FIM 22-32 TASK 819, INITIAL EVALUATION TEST GOOD. SERVO MOTOR TEST PERFORMED NUMEROUS TIMES W/NO FAULTS. PER FIM INTERMITTENT FAULT.

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