No fatalities

ALEXANDER SCHLEICHER GMBH & CO ASK 21 NO SERIES accident at Valyermo, CA, 8 Apr 2022

Valyermo, CA, United States

On April 8, 2022, an ALEXANDER SCHLEICHER GMBH & CO ASK 21 NO SERIES operated by Southern California Soaring Academy, Inc. was involved in an aviation accident near Valyermo, CA. No fatalities were reported. Investigators recorded the probable cause as: The gliders encounter with atmospheric conditions where the lift was not sufficient to maintain flight and subsequent impact with mountainous terrain. This summary draws on records from NTSB; 9 related events involving the same aircraft type or operator are linked below.

SourcesNTSBPrimary reportUpdated 2026-08-03Data APIEditorial standards

Probable cause

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

— NTSB Determination

Contributing factors

Effect on operationContributed to outcomeAttain/maintain not possible