NTSB Identification: DEN84IA281.
The docket is stored on NTSB microfiche number 27888.
Incident occurred Wednesday, September 05, 1984 in SARATOGA, WY
Aircraft: MOONEY M20F, registration: N9121V
Injuries: 2 Uninjured.

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

WHILE IN LEVEL CRUISE FLT AT 10500 FT, THE PLT HEARD A HIGH-PITCHED WHINE THAT LASTED FOR ABOUT 5 SECONDS. THE ENGINE THEN SEIZED AND THE PLT MADE A FORCED LANDING IN MOUNTAINOUS FOOTHILLS. DURING THE LANDING ROLL, THE LANDING GEARCOLLAPSED. EXAMINATION OF THE DISASSEMBLED ENGINE REVEALED EVIDENCE OF HIGH HEAT DISTRESS AND A FRACTURED CRANKSHAFT. DETAILED EXAMINATION OF THE CRANKSHAFT REVEALED EVIDENCE OF A LACK OF LUBRICATION AND FATIGUE. MAINTENANCE RECORDS REVEALED THAT THE ACFT WAS INVOLVED IN A GEAR COLLAPSE INCIDENT IN 1977 THAT RESULTED IN A PROP STRIKE AND SUDDEN ENGINESTOPPAGE. THE ENGINE WAS NOT DISASSEMBLED AND INSPECTED AT THAT TIME AS SUGGESTED BY AVCO LYCOMING SERVICE LETTER NO. L163B.

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

REASON FOR OCCURRENCE UNDETERMINED

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

ENGINE ASSEMBLY,CRANKSHAFT..FATIGUE


Contributing Factors

AIRPORT/FACILITIES..ROUGH/UNEVEN


Contributing Factors

TERRAIN CONDITION..MOUNTAINOUS/HILLY



Contributing Factors

FLUID,OIL..STARVATION


Contributing Factors

ENGINE ASSEMBLY,CRANKSHAFT..OVERTEMPERATURE

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