# SDR AALA201708249017

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 22, 2017
- Submitted: August 27, 2017
- Operation: Air carrier
- Aircraft: [N914NN](https://openairdocs.org/aircraft/N914NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 31161
- Aircraft time: 15,020 hours, 6,092 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Sensor
- Part number: H504C
- Part serial: 20179
- Condition: Inoperative
- Location: Zone 200
- Stage of operation: CL
- How discovered: O
- Nature of condition: F
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA201708249017

## Discrepancy

AIRCRAFT WAS GROUNDED.  EMERGENCY DECLARED.  BOS-ORD FLIGHT RETURNED TO BOS ACCOUNT STABILIZER TRIM INOPERATIVE.  LANDING UNEVENTFUL.  REMOVED AND REPLACED STABILIZER TRIM ACTUATOR PER AMM 27-41-71 (AALA20170822004), MACH TRIM ACTUATOR PER AMM 22-11-24 (AALA20170822006), AND ELEVATOR POSITION SENSOR PER AMM 22-11-30.  OPERATIONAL CHECK GOOD.

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