DRG TAKEOFF, THE ENG BEGAN TO RUN ROUGH AT AN ESTD ALT OF 50 TO 100 FT AGL & WOULD NOT DEVELOPED ENOUGH POWER TO MAINT FLT. SUBSEQUENTLY, AS THE PLT WAS LNDG IN A SOYBEAN FIELD, THE ACFT FLIPPED OVER & CAME TO REST IN AN UPRIGHT ATTITUDE. A TEARDOWN OF THE ENG REVEALED THE PUSH ROD FOR THE LEFT FORWARD EXHAUST VALVE HAD BECOME DISENGAGED (MIS- ALIGNED) FROM ITS RESPECTIVE ROCKER ARM SOCKET, ALLOWING THE EXHAUST VALVE TO REMAIN IN THE CLOSED POSITION. THE REVMASTER/VW ENG HAD A TOTAL FLT TIME OF 76.5 HRS.
The National Transportation Safety Board determines the probable cause(s) of this accident as follows:
Contributing Factors
TERRAIN CONDITION..CROPTERRAIN CONDITION..SOFT
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