What happened
On August 23, 2005, an experimental Opus 3, registration OY-CYZ, was conducting a flight from Rarogne, Switzerland, to Denmark. While navigating the Alpine region, the pilot encountered strong downdrafts near the Grimsel Pass. As the aircraft approached the Furka Pass, the pilot realized the aircraft's altitude was insufficient to clear the 2,431-meter peak.
GPS data revealed that while the aircraft had initially climbed to nearly 5,800 feet, the pilot began a series of climbs and descents to stay beneath the cloud base. This maneuver resulted in a significant altitude deficit at the foot of the pass. With an airspeed of only approximately 60 knots, the pilot determined that a 18/0-degree turn was not possible. To avoid a loss of control, the pilot executed an emergency landing on the upward slope ahead. The aircraft struck the ground violently, bounced, and came to a rest, leaving the single pilot with serious injuries.
The investigation
The investigation, conducted by the AAIB, examined the wreckage and GPS flight data. Investigators found no evidence of mechanical failure, engine malfunction, or medical issues involving the pilot. The aircraft's mass and center of gravity were within limits, and sufficient fuel was on board for the intended mission. The investigation also noted that the aircraft was not equipped with an emergency location beacon (ELBA), though the pilot was able to use a mobile phone to alert rescuers.
Findings
- The primary cause of the accident was an inappropriate flying tactic in a mountainous environment.
- The pilot's decision to fly a profile of successive climbs and descents to avoid clouds led to an insufficient altitude for crossing the pass.
- The low airspeed prevented the pilot from safely performing a turn to return to the valley.
- The pilot's choice to land on the upward slope at full power and a nose-up attitude prevented a more catastrophic impact and contributed to his survival.