# SDR ABXA9900081

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 2, 1999
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: [N816AX](https://openairdocs.org/aircraft/N816AX), registered now
- Make and model: Doug DC-8-63
- Registry model: [Doug DC-8-63](https://openairdocs.org/model/mcdonnell-douglas-dc-8-63) (OpenAirDocs)
- Aircraft serial: 46093
- System (JASC): [2211 · Autopilot Computer](https://openairdocs.org/jasc/2211)
- Part: Computer
- Part number: 2588789904
- Condition: Defective
- Location: E & E Comp
- Stage of operation: CR
- Nature of condition: F
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ABXA9900081

## Discrepancy

DURING CRUISE EXPERIENCED NOSE DOWN HYDRAULIC PITCH TRIM RUN-AWAY.  DISCONNECTED WHEEL LONGITUDINAL TRIM CIRCUIT BREAKERS, NO PROBLEMS REMAINDER OF FLIGHT.  REPLACED R-56 AND S-56 CIRCUIT BREAKERS.  REPLACED PITCH AXIS COMPUTER AND INSPECTED STABILIZER SHUT-OFF VALVE, CONTROL VALVE AND MOTOR AND NO DEFECTS NOTED.  OPS CHECKED NORMAL IAW DC8 MM.  SUBSEQUENT AUTOPILOT INFLIGHT EVALUATION WAS SATISFACTORY.

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