What happened
During an instrument approach utilizing VOR navigation, the aircraft was operating with the autopilot engaged. The crew had configured the altitude hold and alert functions to correspond with the Minimum Descent Altitude (MDA). Upon achieving visual contact with the airport surroundings, the pilot transitioned from automated flight by disconnecting the altitude hold mode and initiating a configuration change involving full flaps.
During this transition, an uncommanded nose-down pitch occurred due to the electric trim system. This sudden change in attitude led to a rapid descent that resulted in the aircraft striking trees before reaching the ground. Despite the impact, both occupants were able to exit the wreckage without sustaining any injuries.
Findings
Investigations into the incident identified several contributing factors related to the flight operations and environmental conditions:
- The presence of a low ceiling at the time of the approach.
- An excessive rate of descent managed by the pilot in command.
- Improper execution of established flight procedures.
- Failure to maintain the assigned clearance.
- The primary cause was identified as an uncontrolled nose-down pitch caused by the electric trim during the transition from autopilot to manual flight.