Incident Overview
A pilot attempted to start an airplane by rotating the propeller by hand after setting the parking brake. The airplane started and began moving forward. The pilot climbed onto the right wing to enter the cockpit but slipped and fell to the ground. He then grabbed the cabin step and was dragged as he tried to gain access to the cockpit.
Collision Sequence
Realizing that a collision with a parked airplane was imminent, the pilot released his hold on the cabin step. Subsequently, the airplane taxied without anyone onboard and collided with a parked airplane.
Mechanical Condition
The pilot reported that there was no mechanical malfunction with the airplane. The incident involved an aircraft that started unexpectedly during a hand-prop start procedure, leading to an unmanned ground movement and impact with another aircraft.