Autopilots

While in IFR cruise at 4000 feet, the pilot observed the flight director command bars move out of view as the airplane started a gradual descent. When the pilot corrected, the electric trim started to run nose down and the aircrafts descent rate increased. The pilot attempted to disconnect the autopilot and trim with the control switches and the red disconnect switch. None of this had any effect. With the turbulence and conditions, the pilot was unable to reach the autopilot and electric trim circuit breakers. After all other remedial procedures had failed, he shut off the avionics master switch at about 1000 feet and recovered the airplane at about 500 feet.

Key Takeaways:

• Multiple aircraft experienced serious autopilot malfunctions, including uncommanded rapid descents and abrupt altitude changes, posing significant flight safety risks.
• In several incidents, standard autopilot disconnect switches failed to disengage the system, forcing pilots to resort to emergency measures like pulling circuit breakers or shutting off the avionics master switch.
• Autopilot failures led to critical situations such as difficulty maintaining control, electrical odor/smoke in the cockpit, and even jammed flight controls, highlighting the dangers of such system failures.

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