NTSB Identification: LAX01LA195.
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Accident occurred Thursday, May 31, 2001 in Butte City, CA
Probable Cause Approval Date: 04/25/2006
Aircraft: Schweizer G-164B, registration: N6902K
Injuries: 1 Serious.

NTSB investigators may have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

The airplane collided with high vegetation when the pilot made an off airport forced landing following a loss of engine power. The local aerial application flight departed a private strip. The pilot reported that a heavy vibration developed in the engine, and he shut it down. He tried to return to a nearby dirt strip, but had to land in a hay field. On the landing roll, the airplane encountered tall vegetation, which damaged the wings and landing gear attachment points. A Federal Aviation Administration inspector examined the airplane, and found a fractured bolt on the propeller. Metallurgical examination of the bolt indicated that the part failed in fatigue at a region of increased stress (stress concentration), though the part overall was not highly stressed (small overstress region).

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

a fatigue failure of a propeller bolt.

Full narrative available

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