Witness Accounts
According to witnesses, the aircraft entered clouds at low altitude during the initial climb after takeoff. They stated that the airplane then turned sharply back toward the airport and descended below the clouds. The aircraft rolled out in the direction of the crash site with its wings rocking. One witness reported that the aircraft "turned over 2 or 3 times" before it crashed.
Investigation Findings
No preimpact part failure or malfunction was evident. The investigation identified three occurrences leading to the accident.
Occurrence #1: In-Flight Encounter with Weather
The aircraft encountered adverse weather conditions during the takeoff-initial climb phase. Findings indicated that the pilot-in-command conducted inadequate preflight planning and preparation. Weather conditions included a low ceiling and fog. The pilot inadvertently flew under visual flight rules (VFR) into instrument meteorological conditions (IMC).
Occurrence #2: Loss of Control
During a maneuver to reverse direction, the pilot initiated a turn. Airspeed was not maintained by the pilot-in-command, resulting in an uncontrolled stall/spin.
Occurrence #3: Collision with Terrain
Following the loss of control, the aircraft entered an uncontrolled descent and collided with terrain. All four occupants were killed.
Probable Cause
The National Transportation Safety Board determined that the probable cause of this accident was the pilot's inadequate preflight planning/preparation, inadvertent VFR flight into IMC (low ceiling and fog), failure to maintain airspeed during a turn to reverse direction, and subsequent uncontrolled stall/spin.