NTSB Identification: SEA84LA022.
The docket is stored on NTSB microfiche number 21950.
Accident occurred Friday, November 18, 1983 in OREGON CITY, OR
Aircraft: CESSNA 150K, registration: N6054G
Injuries: 1 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.

THE PLT, WHO WAS AN A & P MECHANIC, HAD JUST INSTALLED AN ENG THAT HAD BEEN OVERHAULED BY SOMEONE ELSE. HE REPORTED THAT THE PRETAKEOFF & RUN-UP CHECKS WERE NORMAL. AT APRX 250 TO 300 FT AGL, DURING TAKEOFF, THE ENG BEGAN TO SHAKE VIOLENTLY & LOST POWER. THE PLT RETARDED THE THROTTLE & INITIATED A 180 DEG TURN TO LAND IN AN OPEN FIELD. THE LEFT WING TIP CONTACTED THE GROUND DURING THE FORCED LANDING & THE NOSE & RIGHT MAIN GEAR COLLAPSED. AN EXAM & DISASSEMBLY OF THE ENG REVEALED THAT THE #1 CONNECTING ROD HAD COME LOSE & PUNCTURED THE ENG CASE. ONE OF THE BOLTS HAD FAILED & WAS NECKED DOWN AT THE FRACTURE. THE NUTS ON THE REMAINING ROD CAPS WERE FOUND TO BE FINGER TIGHT OR ONLY SLIGHTLY TORQUED. THE REQUIRED TORQUE WAS 40 FOOT POUNDS. THE ENG HAD OPERATED APPRX .1 HR SINCE MAJOR OVERHAUL.

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

ENGINE ASSEMBLY,CONNECTING ROD..UNDERTORQUED

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

MAINTENANCE,MAJOR REPAIR..IMPROPER..OTHER MAINTENANCE PERSONNEL

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

ENGINE ASSEMBLY,CONNECTING ROD..FAILURE,TOTAL

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