Amateur-built ASK 21 N212NM accident near Valyermo, California

Probable cause

The gliders encounter with atmospheric conditions where the lift was not sufficient to maintain flight and subsequent impact with mountainous terrain.

NTSB analysis

The pilot of the glider reported that, while in thermal flight, he made a turn to the south to follow a ridgeline. Before he reached the top of the mountain, the glider experienced a loss of lift. To compensate, he maneuvered the glider away from terrain and encountered additional sink. While maneuvering the glider toward lower terrain, the right-wing tip struck a tree. The glider struck additional trees before it impacted terrain and came to rest between two trees.

The glider sustained substantial damage to the right wing and fuselage. The pilot reported that there were no preaccident mechanical failures or malfunctions with the glider that would have precluded normal operation.

Text from the NTSB. Open the NTSB docket for WPR22LA150 for the full record.