What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
Ground incident: during pre-flight and engine start operations, engine starter did not engage engine, resulting in a no-start. Pilot terminated start operations/checklist, turned off powers/switches, set parking brake and exited the cockpit. Pilot began procedure to slowly turn the engine through via a slow propeller rotation, at which time the engine unexpectedly started. Parking brake held for a moment, and then released. The aircraft then collided with a hangar after the aircraft moved forward. The airframe struck an electrical transformer box, which caused a fire and subsequent loss of the aircraft and its contents.
As the FAA filed it
GROUND INCIDENT: DURING PRE-FLIGHT AND ENGINE START OPERATIONS, ENGINE STARTER DID NOT ENGAGE ENGINE, RESULTING IN A NO-START. PILOT TERMINATED START OPERATIONS/CHECKLIST, TURNED OFF POWERS/SWITCHES, SET PARKING BRAKE AND EXITED THE COCKPIT. PILOT BEGAN PROCEDURE TO SLOWLY TURN THE ENGINE THROUGH VIA A SLOW PROPELLER ROTATION, AT WHICH TIME THE ENGINE UNEXPECTEDLY STARTED. PARKING BRAKE HELD FOR A MOMENT, AND THEN RELEASED. THE AIRCRAFT THEN COLLIDED WITH A HANGAR AFTER THE AIRCRAFT MOVED FORWARD. THE AIRFRAME STRUCK AN ELECTRICAL TRANSFORMER BOX, WHICH CAUSED A FIRE AND SUBSEQUENT LOSS OF THE AIRCRAFT AND ITS CONTENTS.
NTSB investigation
The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.