What happened
During a pre-flight sequence, the pilot placed an equipment bag in the front seat of the aircraft. After verifying that the brakes were set by pressing on each wing lift strut, the pilot attempted to hand start the engine. Although the engine successfully started, it immediately surged to full power. The pilot was unable to reach the cockpit controls in time to manage the sudden surge. As a result, the aircraft moved forward and struck a parked airplane.
Findings
Both aircraft involved in the collision sustained substantial damage. The pilot indicated that the act of placing the equipment bag in the front seat may have inadvertently pushed the throttle forward.
Safety message
According to FAA publication FAA-P-8740-20, no person should attempt to start an aircraft engine without a qualified individual positioned at the cockpit controls.