Accident Details
A pilot experienced difficulty starting the engine and enlisted a mechanic to occupy the cockpit controls while the pilot manually turned the propeller (hand propping) to start the engine. The pilot made several attempts to start the engine, each without success, before trying with the throttle open.
Sequence of Events
On the attempt with the throttle open, the engine started, causing the aircraft to begin moving forward. To prevent a collision with nearby gas pumps and an office building, the pilot pulled on the wing, which caused the aircraft to swerve away from those obstacles. Subsequently, the pilot attempted to open the cockpit door while standing on the wheel fairing. During this action, he fell from the fairing and was knocked unconscious.
After the pilot fell, the aircraft continued moving and collided with a trailer and a hangar.
Mechanic's Account
The mechanic reported that his seat was not locked in place and moved backward when the engine suddenly started. When the pilot pulled on the wing, causing the aircraft to swerve, the mechanic fell out of the aircraft.