Small Aircraft; Low Wing; 1 Eng; Fixed Gear
Flight Crew Private
Flight Crew Last 90 Days 8; Flight Crew Total 920; Flight Crew Type 135
Human-Machine Interface
Ground Event / Encounter Loss Of Aircraft Control; Ground Event / Encounter Object
Aircraft Aircraft Damaged
Aircraft; Human Factors
Chalked left main wheel prior to hand propping the airplane. The plane started with no difficulties. Climbed onto the Left wing to verify throttle setting and advance the magnetos from Left to Both. Climbed down from the wing and removed chalk. After removing the chalk the plane began to roll forward and the hand brake did not hold the plane. Any attempts to stop the airplane from rolling failed. Plane traveled down the alleyway veering to the right and struck the hangars where the plane came to a sudden stop.
Ercoupe 415 pilot reported the parking brake failed while hand propping the aircraft resulting in the aircraft rolling into a hangar.