NTSB Identification: SEA96LA103.
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Accident occurred Wednesday, May 29, 1996 in MOSCOW, ID
Probable Cause Approval Date: 04/03/1997
Aircraft: Schweizer G164B, registration: N48559
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 while conducting an agricultural aerial application flight, the windscreen suddenly became obscured by smoke and oil. Operating over hilly terrain with poor forward visibility through the windscreen, he attempted a forced landing on a ridge top. The airplane was substantially damaged in the forced landing. FAA inspectors who examined the airplane after the accident reported that they found an access plug missing from the front of the crankcase of the aircraft's Pratt & Whitney R-1340 radial engine.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: inflight loss of an unsecured access plug from the engine crankcase, which resulted in a loss of engine oil and a forced landing. Factors relating to the accident were: hilly terrain, and foreign material (engine oil) on the windscreen which limited forward visibility. Full narrative available
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