# SDR ASAA2016090417899

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 4, 2016
- Submitted: September 6, 2016
- Operation: Air carrier
- Aircraft: [N557AS](https://openairdocs.org/aircraft/N557AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35176
- Aircraft time: 39,280 hours, 11,578 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Control Panel
- Part number: 4082260939
- Part serial: 01022379
- Condition: Faulted
- Location: Autopilot
- Part time: 38,958 hours, 15,116 cycles
- Stage of operation: CR
- 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/ASAA2016090417899

## Discrepancy

AUTOPILOT B DISENGAGED TWICE DURING CRUISE FLIGHT, AT FL 340 FT AND AT 10,000 FT DURING DESCENT.  ACFT GROUNDED.  PERFORMED DFCS BITE BOTH A & B SHOWED FAULTS IN FLT 1.  R & R MCP IAW AMM 22-11-34 ALL TEST PASSED.

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