Event Details
A pilot was attempting to start a Cessna 210G by manually rotating the propeller (hand-propping) outside a hangar. The aircraft had one passenger seated in the right front seat. According to the pilot, during the initial attempt, the engine cranked but did not continue running; it stopped. Prior to the second attempt, the pilot inadvertently moved the throttle to a higher position than intended.
Incident Sequence
When the pilot hand-propped the engine a second time, it started and began producing power sufficient to overcome the parking brake's clamping force. The airplane then started moving forward, and its speed increased as it traveled. The aircraft ultimately collided with another airplane that was inside an open hangar.
The official source provides no information regarding injuries, the extent of damage to either aircraft, the date, or the location of this occurrence.