NTSB Identification: DEN04LA044.
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Accident occurred Thursday, February 12, 2004 in West Jordan, UT
Probable Cause Approval Date: 06/30/2004
Aircraft: Cessna 152, registration: N66952
Injuries: 2 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.

According to the instructor, they were practicing ground maneuvers at approximately 6,000 feet msl when the engine began to "run rough." The instructor said they were unable to maintain altitude, and while returning to the airport the "engine quit." The instructor made a forced landing in a snow-covered field. During the landing, the airplane's nose landing gear caught the snow and the airplane nosed over. The airplane's nose landing gear was displaced aft, buckling the firewall. The empennage was buckled just aft of the rear window, and the vertical stabilizer was crushed. The instructor said the field was covered with over a foot of snow. An examination of the airplane's engine revealed a hole in the number 1 piston, and a fractured exhaust valve for the number 1 cylinder.

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

the failure of the exhaust valve for the engine's number one cylinder, resulting in the exhaust valve/piston contact and the subsequent total loss of engine power. Contributing factors include the lack of suitable terrain for a forced landing and the snow covered field.

Full narrative available

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