# SDR TWAA0011802

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 24, 2000
- Submitted: September 28, 2000
- Operation: Air carrier
- Aircraft: [N706TW](https://openairdocs.org/aircraft/N706TW), registered now
- Make and model: Boeing 757-2Q8
- Registry model: [Boeing 757-2Q8](https://openairdocs.org/model/boeing-757-2q8) (OpenAirDocs)
- Aircraft serial: 28165
- Aircraft time: 13,630 hours, 4,109 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Computer
- Part number: 6224717106
- Part serial: 103015
- Condition: Malfunctioned
- Location: Lt Auto Pilot
- Stage of operation: TO
- How discovered: O
- Nature of condition: J
- Precautionary procedure: C
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/TWAA0011802

## Discrepancy

THE LEFT AUTOPILOT SELF-ENGAGED DURING TAKEOFF.  ABORTED TAKEOFF AND RETURNED TO THE GATE.  THE LEFT AUTOPILOT WAS DEACTIVATED AND DEFERRED PER MEL. CHECK-C 2-20-00 LAX.  ---OPEN---  S/D.  THE AUTOFLIGHT CONTROL SYSTEM MODE CONTROL PANEL (MCP) WAS REPLACED.  THE MANUFACTURER TESTING SHOWED THE MCP A SIDE PROCESSOR WAS NOT PROPERLY RETURNING FROM A PROCEDURE CALL, AND SIGNIFICANT PROBLEMS WITH THE INTERFACE TO THE RAM MEMORY DEVICES.  THESE MCP FAILURES CAN CAUSE THESE UNCOMMANDED AUTOPILOT ANOMALIES TO OCCUR.  THIS IS A CORRECTION.

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