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:

• Autopilot and trim system components, primarily servos, are experiencing malfunctions across various Beechcraft and Cessna aircraft models.
• These failures result in critical flight control issues such as uncommanded pitch inputs, binding controls, porpoising, and even smoke in the cockpit.
• Multiple incidents highlight recurring problems with specific components or on the same aircraft, indicating persistent reliability issues.

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