What happened
During a non-scheduled domestic passenger flight, the pilot was executing a VOR/DME approach to runway 22 at Wiley Field in Miles City, Montana. While transitioning from the procedure turn toward the final approach fix, the pilot engaged the autopilot and approach modes. Upon reaching the minimum descent altitude, the pilot transitioned to altitude hold mode.
As the aircraft approached the MAP, the pilot prepared for a missed approach; however, a passenger occupying the co-pilot seat indicated that the runway was visible. Following this observation, the pilot identified the runway and reduced engine power to facilitate the landing descent. During this maneuver, the aircraft experienced an abrupt nose-up pitch, leading to an aerodynamic stall. The aircraft subsequently descended into the ground and skidded off the runway surface. The accident resulted in two injuries, while four other passengers remained unharmed.
Findings
Investigations into the incident identified several contributing factors related to environmental conditions and pilot actions:
- Low visibility caused by fog and low ceilings, which obscured the terrain.
- Improper utilization of the autopilot system by the pilot in command.
- A reduction in engine power/throttle control during a critical phase of flight.
- An inadvertent stall and loss of control resulting from an abrupt pitch maneuver.