What happened
A 2 Place Glider was being towed on a flight from Endicott to Binghamton, NY. The crew consisted of a private pilot and an instructor traveling as an intended passenger. As the aircraft approached its destination, the glider was released from the tow plane and maneuvered for a landing on Runway 34.
The approach to Runway 34 required flying over rising terrain, which included a cliff located short of the runway threshold. During the final approach, the glider encountered an excessive sink rate. Realizing the aircraft would not reach the runway, the instructor took control of the glider. The instructor attempted to maneuver the aircraft to avoid obstacles and rising terrain to find a suitable landing area. However, while still in the turn, a wingtip contacted the terrain, resulting in a crash landing.
The investigation
During a post-accident examination of the aircraft, investigators found the spoilers in the 'up' position. The investigation was unable to determine if the spoilers had been extended prior to the impact or as a result of it.