Overview
A witness reported observing an airplane during its climbout from runway 32. The aircraft initiated a right turn with an estimated bank angle of 30 to 45 degrees. It then ceased climbing and began a descent, subsequently colliding with a tree line while still in a right bank, before impacting the ground.
Witness Account
The witness described the weather at the time of the accident as very dark, with no ambient light or visible horizon. This lack of visual references was noted as a contributing condition.
Investigation Findings
Examination of the airframe, flight control system, engine assembly, and propeller assembly revealed no evidence of any precrash failure or malfunction. The autopilot was found in the off position, and its circuit breakers had not tripped.
Radio Communication
A radio transcript indicated that after takeoff, the flight made a single transmission requesting an IFR clearance.
Injuries and Pilot Statements
The pilot and passenger sustained serious injuries. Neither had any memory of the flight.
Probable Cause
The official probable cause was stated as: "Failure of the pilot to maintain a proper climb rate after takeoff, and his inadvertent entry in a descending spiral, which he failed to correct. Factors relating to the accident were: darkness, and the pilot becoming spatially disoriented during the initial climb while attempting to obtain an ifr clearance."