NTSB Identification: LAX00LA250.
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Accident occurred Tuesday, July 04, 2000 in GRASS VALLEY, CA
Probable Cause Approval Date: 10/17/2001
Aircraft: Thorp T211, registration: N91313
Injuries: 2 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 pilot was cruising the local area about 1,000 feet agl, at 2,500 rpm, when the airplane suddenly started to descend. Although he hadn't noticed any evidence of strong winds, he was on the lee side of a peak. He turned to avoid the wind shear and applied full power, but his descent continued. The airplane collided with 100-feet tall trees after he maneuvered to avoid hitting one straight on with the cabin area.

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

the pilot encountered a mountain wave at an altitude too low to maintain clearance from trees.

Full narrative available

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