NTSB Identification: WPR11CA041
14 CFR Part 91: General Aviation
Accident occurred Saturday, November 06, 2010 in Heber City, UT
Probable Cause Approval Date: 03/16/2011
Aircraft: AVIAT AIRCRAFT INC A-1B, registration: N178WW
Injuries: 1 Uninjured.

NTSB investigators used data provided by various entities, including, but not limited to, the Federal Aviation Administration and/or the operator and did not travel in support of this investigation to prepare this aircraft accident report.

The pilot reported that he was practicing the procedures for making approaches to back-country remote airstrips and was flying in approach configuration about 40 to 60 feet over a mountain ridge. Although the wind was light and variable, just as the airplane was crossing the ridge it encountered a downdraft, which resulted in a sudden loss of altitude. Before the pilot was able to correct the descent, one of the airplane's main landing gear tires came in contact with the snow-covered terrain, which resulted in the airplane slowing down and flipping over onto its back. The accident sequence resulted in damage to the top of the rudder and to one of the wing lift struts. The pilot reported no mechanical failures or malfunctions with the airplane at the time of the accident.

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

The pilot's failure to maintain clearance from the ground during low-level maneuvering in mountainous/hilly terrain.

Full narrative available

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