Primary finding
Probable cause
The airplane’s encounter with windshear on takeoff, which resulted in a loss of control and impact with the ground.
Investigator assessment
Analysis narrative
The pilot reported that, just after takeoff from a remote off-airport landing site, he encountered windshear that pushed the airplane into the tops of alder trees and onto a gravel bar. The airplane sustained substantial damage to the fuselage, right wing and right elevator. The pilot reported no preaccident mechanical failures or malfunctions that would have precluded normal operations.