WINDOW ROCK, AZ, USA
N68WK
KIESEL MIDGET MUSTANG
THE AIRCRAFT LOST POWER SHORTLY AFTER TAKEOFF AND COLLIDED WITH A DIRT BANK DURING THE SUBSEQUENT FORCED LANDING. ENGINEEXAMINATION REVEALED AN OPEN INTAKE VALVE ON THE NUMBER 4 CYLINDER AND THE PILOT STATED A 'BENT AND CRACKED CRANKSHAFT FROM A PRIOR ACCIDENT' WAS DISCOVERED DURING THE ENGINE EXAMINATION. THE ENGINE MANUFACTURER STATED THAT AN OPEN INTAKE VALVE COULD INDUCE SIGNIFICANT POWER LOSS BY ALLOWING EXHAUST GASSES TO PRESSURIZE THE INTAKE MANIFOLD, THEREBY ALTERINGTHE FUEL/AIR MIXTURE. THE MAINTENANCE RECORDS ESTABLISHED THAT THE AIRCRAFT HAD FLOWN ONLY NINE HOURS SINCE THE LAST CONDITION INSPECTION.
Source: NTSB Aviation Accident Database
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