NTSB Identification: FTW85LA318.
The docket is stored on NTSB microfiche number 28092.
Accident occurred Tuesday, August 13, 1985 in MAY, TX
Aircraft: PIPER PA-28-140, registration: N9912W
Injuries: 1 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.
THE PLT STATED THE ENG RPM DROPPED TO 1500 DURING LEVEL CRUISE FLT AT 4200 FT MSL. HE COULD NOT REGAIN PWR. HE DIVERTED THE FLT AND ATTEMPTED TO REACH THE BROWNWOOD, TX, ARPT BUT DID NOT HAVE SUFFICIENT ALT. A FORCED LANDING WAS MADE IN A RUGGED, HEAVILY WOODED AREA. A SUBSEQUENT ENG EXAMINATION REVEALED THAT THE #3 EXHAUST VALVE STEM HAD SEPARATED. THE EXHAUST VALVE HEAD HEAVILY DAMAGED THE PISTON AND CYLINDER HEAD. REASON FOR THE VALVE STEM SEPARATION IS UNDETERMINED.
The National Transportation Safety Board determines the probable cause(s) of this accident to be:ENGINE ASSEMBLY,VALVE,INTAKE..FAILURE,TOTAL
TERRAIN CONDITION..NONE SUITABLE
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