NTSB Identification: MKC85LA141.
The docket is stored on NTSB microfiche number 28838.
Accident occurred Tuesday, June 25, 1985 in RUSHVILLE, MO
Aircraft: CESSNA 150M, registration: N704ZS
Injuries: 2 Minor.

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

SHORTLY AFTER THE PLT DEPARTED ON A FLT, THE ENG LOST POWER WHILE THE ACFT WAS CRUISING AT 1800 FT MSL OVER HILLY TERRAIN. THE PLT REPORTED THAT THE ENG SPEED DROPPED TO 800 RPM & HE WAS UNABLE TO CORRECT THE SITUATION. DURING A FORCED LANDING ON SOFT TERRAIN, THE ACFT ENCOUNTERED A DITCH & NOSED OVER. AN EXAM OF THE ACFT REVEALED THAT A SELF LOCKING, NAS679A3, SAFETY NUT HAD SEPARATED & THE RESPECTIVE BOLT HAD BACKED OUT, DISCONNECTING THE THROTTLE LINKAGE. THE NUT HAD 2569 OPERATIONAL HRS IN SERVICE & THE ACFT HAD FLOWN 44 HRS SINCE THE LAST ANNUAL INSPECTION. CESSNA SERVICE LETTER, SE 76-6, DATED 4/16/79, RECOMMENDED THAT THE NAS679A3 NUT BE REPLACED BY AN AN310 CASTELLATED NUT & COTTER PIN. AS OF THE DATE OF THE ACCIDENT, NO AIRWORTHINESS DIRECTIVE HAD BEEN ISSUED TO REQUIRE THE CHANGE.

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

THROTTLE/POWER LEVER,LINKAGE..DISCONNECTED


Contributing Factors

TERRAIN CONDITION..NONE SUITABLE


Contributing Factors

TERRAIN CONDITION..SOFT


Contributing Factors

MAINTENANCE,SERVICE BULLETIN/LETTER..NOT FOLLOWED..OTHER MAINTENANCE PERSONNEL


Contributing Factors

TERRAIN CONDITION..DITCH

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