What happened
On August 4, 2001, at approximately 14:30 UTC, a Ventus cM motor glider, registration D-KDMB, crashed near Monte della Laghetta in the L'Aquila region of Italy. The aircraft was participating in the Mediterranean International Cup, a gliding competition held at Rieti Airport.
The pilot was attempting to gain altitude by utilizing thermal currents near the slopes of Monte Gorzano. According to an eyewitness from another competing glider, the aircraft began a right-hand turn toward the valley. During this maneuver, the right wing dropped abruptly, and the aircraft entered a steep, near-vertical dive. The impact occurred only seconds after the onset of the maneuver, resulting in the death of the pilot.
The investigation
The ANSV investigation faced significant challenges due to the remote and rugged terrain at an altitude of 2,400 meters. High winds and difficult topography prevented immediate access to the wreckage. Furthermore, investigators discovered that much of the aircraft's instrumentation, including the GPS flight recorder, had been stolen from the wreckage following the accident.
The investigation focused on the flight dynamics and the environmental conditions at the time of the accident. Investigators examined the wreckage, which had sustained extensive structural damage, and analyzed the meteorological data, which indicated thermal inversions and complex air currents near the mountain ridges.
Findings
- Loss of control: The primary cause of the accident was the loss of control leading to a right-hand spin. This was triggered by the pilot's control inputs; in an attempt to exit a descending air current, the pilot increased the bank angle, which reduced the margin to a stall.
- Human factors: The pilot's actions contributed to the spin. Additionally, the investigation noted a potential decrease in situational awareness and a failure to maintain sufficient vertical separation from the ridge.
- Environmental factors: Complex orographic and meteorological conditions, including thermal inversions and localized vortices near the mountain slope, facilitated the onset of the spin.
- Insufficient time for recovery: Due to the sudden nature of the event and the proximity to the terrain, the pilot was unable to complete the necessary recovery maneuvers before impacting the ground.