# SDR AALA202109203014

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 17, 2021
- Submitted: September 20, 2021
- Operation: Air carrier
- Aircraft: [N858NN](https://openairdocs.org/aircraft/N858NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 30904
- Aircraft time: 33,031 hours, 13,538 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Actuator
- Part number: 158300101
- Part serial: 23675
- Condition: Faulted
- Location: Elevator
- Part time: 3,601 hours, 1,515 cycles
- Stage of operation: NR
- How discovered: O
- Nature of condition: F
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202109203014

## Discrepancy

AIRCRAFT WAS GROUNDED: ABRUPT PITCH DOWN MOMENTS AFTER AUTOPILOT A ENGAGED AT FL310, SPEED MACH .79 AUTOPILOT B NORMAL.. REPLACED AUTOPILOT ELEVATOR ACTUATOR A PER AMM 22-11-26 .

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