NTSB Identification: ATL85LA217.
The docket is stored on NTSB microfiche number 29123.
Accident occurred Saturday, July 13, 1985 in FRANKLIN, NC
Aircraft: PIPER PA-28-180, registration: N779VM
Injuries: 2 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

WHILE IN CRUISE FLT ENG RPM DECREASED. PLT ACTIONS TO RECOVER RPM WERE UNSUCCESSFUL AND ENG EVENTUALLY QUIT. A FORCED LANDING WAS MADE TO AN EMPTY FLD. ON ROLL OUT THE ACFT HIT A CONCEALED DITCH RESULTING IN SUBSTANTIAL DAMAGE. LATER, EXMINATION OF THE ENG SHOWED THAT THE #3 EXHAUST VALVE HAD SEIZED IN A PARTIALLY OPEN POSITION AND THE CORRESPONDING PUSHROD WAS BROKEN. THERE WAS EVIDENCE THAT THE VALVE HAD NOT BEEN SEATED FOR SOME TIME WITH CARBON BUILDUP ON THE VALVE AND VALVE SEAT.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

ENGINE ASSEMBLY,VALVE,INTAKE..BINDING(MECHANICAL)

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

ENGINE ASSEMBLY,PUSH ROD..FAILURE,TOTAL


Contributing Factors

TERRAIN CONDITION..HIGH OBSTRUCTION(S)


Contributing Factors

TERRAIN CONDITION..HIGH VEGETATION


Contributing Factors

TERRAIN CONDITION..HIDDEN OBSTRUCTION(S)


Contributing Factors

UNSUITABLE TERRAIN OR TAKEOFF/LANDING/TAXI AREA..INADVERTENT USE..PILOT IN COMMAND

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