N. MYRTLE BEACH, SC, USA
N62721
PIPER PA-23-250
THE PILOT SET THE PARKING BRAKE AFTER STARTING THE AIRCRAFT AND DIVERTED HIS ATTENTION TO THE CHECKLIST. WHEN HE LOOKED UP THE AIRCRAFT WAS MOVING. THE PILOT ATTEMPTED TO STOP THE AIRCRAFT BY BOTH PUSHING THE TOE BRAKES AND PULLING THE PARKING BRAKE. THE AIRCRAFT COLLIDED WITH ANOTHER AIRCRAFT CAUSING SUBSTANTIAL DAMAGE. PIPER ENGINEERING PERSONNEL REPORT THAT THE PARKING BRAKE COULD BE OVERRIDDEN BY FIRM APPLICATION OF TOE BRAKES UNDER NORMAL CIRCUMSTANCES. THEY REPORT HOWEVER, THAT IF THE PARKING BRAKE WAS BEING HELD IN THE 'ON' POSITION WITH 20 POUNDS OF FORCE, APPROXIMATELY 200 POUNDS OF TOE BRAKE PRESSURE WOULD BE REQUIRED BEFORE IT COULD BE OVERCOME AND BEFORE MORE HYDRAULIC PRESSURE COULD BE APPLIED TO THE WHEEL BRAKES.
Source: NTSB Aviation Accident Database
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