NTSB Identification: SEA05LA057.
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Accident occurred Monday, March 07, 2005 in Covington, WA
Probable Cause Approval Date: 09/13/2005
Aircraft: Cessna 152, registration: N65579
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 pilot reported that he had just dropped off a passenger and was returning to his home base. The pilot stated that after departure and climbing through 5,000 feet, he heard a noise. He continued to climb to altitude, and the noise appeared to have stopped, but he noticed that the oil temperature was increasing. The pilot enrichened the mixture and the oil pressure suddenly dropped. The pilot turned back to his departure airport, and when about eight miles from the airport, he heard a "knocking" noise, then the engine lost power. The pilot could not locate the airport, so he opted to make an off airport landing to a road. During the maneuver for landing, the right wing collided with trees, substantially damaging the outboard about five feet of wing structure. During the post-accident inspection of the engine it was found that engine oil was present on the belly of the fuselage from the nose to the tail. Approximately 20 gallons of fuel was present in the wing fuel tanks. The forward crankshaft seal was only partially seated in the nose of the engine case. The lower numbers 1 and 4 spark plugs were removed and showed signs of lead fouling. The numbers 3 and 4 primer lines were found loose at the cylinder. The numbers 1 and 3 connecting rods failed and the numbers 2 and 4 connecting rod bearing material was melted and squeezed between the rod cap and the crankshaft. The engine case halves displayed several holes. The number 2 cylinder cracked the case around the cylinder base and was attached to the engine by two studs.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: The failure of connecting rods during cruise flight resulting in a loss of engine power. Trees were a factor. Full narrative available
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