# SDR ASAA2014040107403

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 1, 2014
- Submitted: April 3, 2014
- Operation: Air carrier
- Aircraft: [N457AS](https://openairdocs.org/aircraft/N457AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 36355
- Aircraft time: 478 hours, 158 cycles
- System (JASC): [2230 · Auto Throttle System](https://openairdocs.org/jasc/2230)
- Part: Servo
- Part number: 305RAA1
- Part serial: AS09881
- Condition: Failed
- Location: Autothrottle
- Part time: 483 hours, 160 cycles
- Stage of operation: NR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2014040107403

## Discrepancy

ATS WILL NOT STAY ENGAGED.  ACFT GROUNDED.  VERIFIED DEFECT, NR 2 SERVO MOTOR FAILED SERVO MOTOR TEST.  R & R NR 2 A/T SERVO MOTOR REF MM 22-31-91, OPS CHECK NORMAL.

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