# SDR ASAA2022051038254

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 10, 2022
- Submitted: May 11, 2022
- Operation: Air carrier
- Aircraft: [N933AK](https://openairdocs.org/aircraft/N933AK), registered now
- Make and model: Boeing 737-9
- Registry model: [Boeing 737-9](https://openairdocs.org/model/boeing-737-9) (OpenAirDocs)
- Aircraft serial: 44098
- Aircraft time: 419 hours, 116 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Actuator
- Part number: 158300101
- Part serial: 42874
- Condition: Faulty
- Location: Left Mlg Wheel W
- Part time: 427 hours, 118 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/ASAA2022051038254

## Discrepancy

AUTOPILOT B DISENGAGED APPROX 3 HOURS 25 MINUTES INTO THE FLIGHT AT CRUISE ALT. UPON REENGAGEMENT, AIRCRAFT MOMENTARILY ROLLS LEFT THEN AUTOPILOT DISENGAGES. AUTOPILOT A WORKS NORMALLY. GROUNDED - YES. FAULT HISTORY SHOWS A/P DISC TWICE ON LEG 4 AT FL350. MSG 22-11505, AIL ACT 2. ACCOMPLISHED DFCS LIB TEST 21 AIL CH B AND 10 FCC, ALL TEST PASS REF B737-9 IFIM 22-11-00-810-831. REMOVED AND REPLACED AUTOPILOT AILERON ACTUATOR B, REF B737-9 AMM 22-11-25-000/400-801. GROUND VERIFICATION PASS. ALL LLM TEST PASS REF AMM 22-11-25-820-801.

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