FRASER, MI, USA
N2469
WILLI/BENSEN B-8M
AS THE STUDENT PILOT WAS TAKING OFF IN HIS EXPERIMENTAL HOME BUILT GYROPLANE, THE ENGINE LOST POWER, SHORTLY AFTER LIFT-OFF. SUBSEQUENTLY, THE GYROPLANE WAS DAMAGED DURING AN EMERGENCY LANDING. AN EXAM OF THE FUEL SYSTEM REVEALED THAT TANK SEALER HAD DETERIORATED ON THE INSIDE OF THE SEAT TANK & HAD DROPPED IN THE FUEL. SUBSEQUENTLY, A CHECK VALVE FOR A RUBBER HAND BULB (USED TO PRIME THE FUEL PUMPS) HAD BECOME STUCK. THIS RESULTED IN BLOCKAGE OF FUEL TO THE ENGINE.
DETERIORATION OF THE INTERNAL SURFACE OF THE FUEL TANK WHICH LED TO BLOCKAGE OF THE FUEL FLOW AND SUBSEQUENT FUEL STARVATION OF THE ENGINE.
Source: NTSB Aviation Accident Database
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