# SDR ASAA2023041342877

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 13, 2023
- Submitted: April 17, 2023
- Operation: Air carrier
- Aircraft: [N477AS](https://openairdocs.org/aircraft/N477AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 40716
- Aircraft time: 28,087 hours, 8,705 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Motor
- Part number: 6355C000101
- Part serial: 6984
- Condition: Faulted
- Location: Stab Trim
- Part time: 28,140 hours, 8,717 cycles
- Stage of operation: CR
- 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/ASAA2023041342877

## Discrepancy

AUTOPILOT A DISCONNECTED IN CRUISE FLIGHT. GROUNDED - YES.  INSPECTED AND FOUND FAULT MESSAGE 22-11186 SEVERAL TIMES IN AUTO PILOT DISCONNECT AND DFCS LOGGED FAULTS. PER FIM 22-11 TASK 854. REPLACED STABILIZER TRIM MOTOR M1659. RMVD AND INSTALLED NEW M1669. REF B737-900 AMM 27-41-71/401.

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