# SDR ASAA2016032016023

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 20, 2016
- Submitted: March 22, 2016
- Operation: Air carrier
- Aircraft: [N428AS](https://openairdocs.org/aircraft/N428AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 36353
- Aircraft time: 39 hours, 14 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Autopilot Sys
- Condition: Unknown
- Stage of operation: AP
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2016032016023

## Discrepancy

ON APPROACH INTERCEPTING LOC AND GS, ACFT STOPPED AUTO TRIMMING WITH AUTOPILOT ENGAGED.  ACFT PITCHED UP.  DISCONNECTED THE AUTOPILOT AND AUTOTHROTTLES WHEN STABILIZER OUT TRIM LIGHT ILLUMINATED.  TOOK APPROXIMATELY 5 FULL ROTATIONS OF THE TRIM WHEEL TO RE-TRIM THE ACFT.  ACFT GROUNDED.  IAW  FIM TASK 22-11, TASK 801, DFCS BITE TEST, NO FAULTS FOUND.  PERFORMED STABILIZER TRIM MOTOR TEST, IAW AMM 22-11-81-710-801.  SYS OPS NORMAL.

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