What happened
On May 19, 2007, a solo flight in a Grob Astir CS Jeans glider, registration PH-1383, ended in a heavy landing at Terlet airfield. The flight began with a winch launch that was notably problematic; the pilot experienced inconsistent pulling force and believed the release mechanism had failed, though no mechanical failure occurred. Following the launch, the pilot entered the landing circuit and observed two other gliders positioned in the landing area.
Seeking to avoid these aircraft, the pilot attempted to land in the narrow gap between them. During the final approach, the pilot's attention was divided by the presence of the other aircraft and personnel on the field. As the pilot attempted to flare for landing, the nose of the Grob Astir CS Jeans struck the ground first. The aircraft then bounced three times across the terrain, leading to significant structural damage, including a shattered cockpit canopy, multiple fuselage tears, and a broken rudder. The pilot sustained no injuries.
The investigation
The investigation focused on the pilot's experience, the briefing provided by the instructor, and the environmental factors during the landing. The pilot, while experienced in general gliding, had only completed four flights in this specific aircraft type. The investigation also examined the role of the instructor, who was a trainee, and the oversight provided by their mentor. Furthermore, the investigation reviewed the airfield procedures regarding the presence of personnel and aircraft in the landing zone.
Findings
Several contributing factors led to the accident. The pilot's limited experience with the specific aircraft type meant they were likely struggling with the landing characteristics. The investigation found that the pilot's concentration was compromised by the stressful winch launch and the intense focus required to navigate the narrow space between the two stationary gliders.
Additionally, the instructor, who was in training, failed to provide a comprehensive briefing regarding alternative landing options in the event of an obstructed field. The investigation also noted that the instructor's mentor bore the ultimate responsibility for ensuring the quality of the briefing and the safety of the solo flight. The presence of personnel and aircraft in the landing area further complicated the pilot's decision-making process.
Safety action
The investigation highlighted the necessity for trainee instructors to receive constant coaching from mentors, particularly when supervising solo flights. It is essential that briefings include specific instructions on how to handle obstructed landing zones. Furthermore, the findings emphasize the importance of clear airfield procedures and the responsibility of pilots to plan for alternative landing sites to prioritize safety over operational convenience.