What was found
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.