What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) Was preparing for flight, had set the parking brakes and started the r/h engine. Increase power of r/h engine to 75% to start l/h engine reduced power on both engines to idle and had feet on the brakes. Pilot was looking down taking clearance information when a/c unknown to the pilot moved forward and the l/h propeller struck the fabric awning on the entrance of the FBO. The a/c was immediately stopped with the brakes and the engines shut down. The l/h propeller sustained substantial damage, and the l/h engine had a sudden reduction in speed. No other damage to the a/c was noted. Upon further inspection of the a/c by maintenance personnel the r/h brake line in the upper portion of the wheel well was found to be cracked. This could have caused the pressure to bleed off the brakes.
As the FAA filed it
(-23) WAS PREPARING FOR FLIGHT, HAD SET THE PARKING BRAKES AND STARTED THE R/H ENGINE. INCREASE POWER OF R/H ENGINE TO 75% TO START L/H ENGINE REDUCED POWER ON BOTH ENGINES TO IDLE AND HAD FEET ON THE BRAKES. PILOT WAS LOOKING DOWN TAKING CLEARANCE INFORMATION WHEN A/C UNKNOWN TO THE PILOT MOVED FORWARD AND THE L/H PROPELLER STRUCK THE FABRIC AWNING ON THE ENTRANCE OF THE FBO. THE A/C WAS IMMEDIATELY STOPPED WITH THE BRAKES AND THE ENGINES SHUT DOWN. THE L/H PROPELLER SUSTAINED SUBSTANTIAL DAMAGE, AND THE L/H ENGINE HAD A SUDDEN REDUCTION IN SPEED. NO OTHER DAMAGE TO THE A/C WAS NOTED. UPON FURTHER INSPECTION OF THE A/C BY MAINTENANCE PERSONNEL THE R/H BRAKE LINE IN THE UPPER PORTION OF THE WHEEL WELL WAS FOUND TO BE CRACKED. THIS COULD HAVE CAUSED THE PRESSURE TO BLEED OFF THE BRAKES.