# SDR ASAA2015031110920

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 11, 2015
- Submitted: March 13, 2015
- Operation: Air carrier
- Aircraft: [N569AS](https://openairdocs.org/aircraft/N569AS), registered now
- Make and model: Boeing 737490
- Aircraft serial: 35184
- Aircraft time: 30,655 hours, 9,582 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Autopilot Sys
- Condition: Malfunctioned
- Stage of operation: CR
- 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/ASAA2015031110920

## Discrepancy

AFTER APPROXIMATELY 2 HRS AT CRUISE, AUTOPILOT CMD A DISENGAGED ON ITS OWN WITH NO INADVERTENT PILOT ACTION.  ACFT BEGAN AA GENTLE 200'-300' CLIMB THAT WAS ARRESTED IN 20. ACFT HAND FLOWN BACK TO ASSIGNED ALTITUDE, RETRIMMED VERY SLIGHTLY, NOSE DOWN.  A/P ENGAGE CMD A RESELECTED ON.  AUTOPILOT CONNECTED AND FLEW ACFT NORMALLY. NO MASTER CAUTION, NO ABNORMAL INDICATION ON OVERHEAD PANEL.  NOTHING IDENTIFIED AS HAVING CAUSED AUTOPILOT TO DISCONNECT.  AUTOPILOT CMD A THEN OPERATED COMPLETELY NORMALLY.  ACFT GROUNDED.  PERFORMED DFCS CURRENT STATUS BITE WITH NO FAULTS FOUND.  PERFORMED FAULT HISTORY BY FLT DECK EFFECT ON CHANNEL A FOUND MCP J1A -KO6 FAULT PERFORMED MCP TEST IAW FIM 22-11, TASK 803 AUTO TEST PASSED.  ACFT OK FOR SERVICE.

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