Control System Servos

At FL400, the autopilot started porpoising and was turned off. Afterward, the aircraft would not trim properly. The crew diverted; it was difficult to keep it pitched down while descending. During the final phase of flight, the yoke was very difficult to input pitch changes, but was okay in the roll axis. After landing, troubleshooting duplicated the problem. Elevator servo (p/n 4006719914) was replaced with serviceable unit.

Key Takeaways:

• Multiple aircraft models experienced various autopilot and servo malfunctions, primarily affecting pitch control.
• Reported issues included overheated servos, uncommanded pitch inputs, binding, porpoising, and difficulties with trim.
• Several incidents highlighted recurring or intermittent component failures, suggesting potential reliability concerns with these autopilot system parts.

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