Incident Overview
A student pilot was soaring along a ridgeline in weak ridge conditions when the glider encountered a sinking air mass. While maneuvering, the right wing of the glider struck a tree. Despite the impact, the pilot retained control and continued the flight, landing without further incident at Dillingham Airfield.
Discovery of Damage
The damage to the aircraft was not immediately reported. An off-duty Federal Aviation Administration Flight Standards District Office (FSDO) supervisor observed the aircraft in the hangar and noticed the damage, prompting further inspection.
Operational Context
The student pilot was operating in weak ridge conditions, which provide limited lift. The encounter with a sinking air mass, or downdraft, reduced the glider's altitude margin, leading to the collision with terrain vegetation.