What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
Pilot was unable to start the engine due to required charge of the pneumatic system. After requesting external servicing the pilot closed the compressed air supply valve which is a required step. This is to insure against over pressurizing of the pneumatic system. Mechanic with the external air tank did not bring the correct adapter and left to find another one. At this time a second mechanic arrived and offered to hand start the engine. The engine was started successfully followed by a post start check list. While traveling on taxiway delta the aircraft began to experiance brake loss. Immediately upon realizing the comressed air supply valve was still in the closed position the pilot attempted to open the valve but did not have enough time before the aircraft impacted the fence.
As the FAA filed it
PILOT WAS UNABLE TO START THE ENGINE DUE TO REQUIRED CHARGE OF THE PNEUMATIC SYSTEM. AFTER REQUESTING EXTERNAL SERVICING THE PILOT CLOSED THE COMPRESSED AIR SUPPLY VALVE WHICH IS A REQUIRED STEP. THIS IS TO INSURE AGAINST OVER PRESSURIZING OF THE PNEUMATIC SYSTEM. MECHANIC WITH THE EXTERNAL AIR TANK DID NOT BRING THE CORRECT ADAPTER AND LEFT TO FIND ANOTHER ONE. AT THIS TIME A SECOND MECHANIC ARRIVED AND OFFERED TO HAND START THE ENGINE. THE ENGINE WAS STARTED SUCCESSFULLY FOLLOWED BY A POST START CHECK LIST. WHILE TRAVELING ON TAXIWAY DELTA THE AIRCRAFT BEGAN TO EXPERIANCE BRAKE LOSS. IMMEDIATELY UPON REALIZING THE COMRESSED AIR SUPPLY VALVE WAS STILL IN THE CLOSED POSITION THE PILOT ATTEMPTED TO OPEN THE VALVE BUT DID NOT HAVE ENOUGH TIME BEFORE THE AIRCRAFT IMPACTED THE FENCE.
NTSB investigation
The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.