NTSB Identification: MKC86LA078.
The docket is stored on NTSB microfiche number 31206.
Accident occurred Wednesday, April 02, 1986 in AVA, MO
Aircraft: CESSNA 172, registration: N80751
Injuries: 3 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 REPORTS THAT THE ENG BEGAN TO RUN ROUGH AND LOSE RPM WHILE THE ACFT WAS CRUISING AT 2500 FT. HE SAID HE ATTEMPTED EMERG PROC BUT THE LOSS OF RPM CONTINUED AND HE DECIDED ON AN OFF-ARPT LANDING. DURING THE APCH TO THE LANDING AREA THE ENG RPM DROPPED TO 1200 AND THE PLT SECURED THE ENG. DURING THE FORCED LANDING THE ACFT HIT A SMALL TREE AND A FENCE POST. EXAM OF THE ENG REVEALED A BROKEN EXHAUST VALVE IN THE #1 CYL. METALLURGICAL EXAM OF THE BROKEN VALVE REVEALED EVIDENCE OF A PROGRESSIVE FAILURE.

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

ENGINE ASSEMBLY,VALVE,INTAKE..FAILURE,TOTAL



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