What happened
On 17 October 2006, a Lancair FB320, registration OO-136, crashed into a hillside in the Escuaín Gorge, within the municipality of Puértolas, Huesca. The flight was a private, non-commercial operation intended to transport the pilot from Marmande, France, to Tangiers, Morocco, for business purposes.
After an initial leg from Marmande to Tarbes, the pilot departed Tarbes-Lourdes-Pyrénées at 12:52 local time under Visual Flight Rules (VFR). During the flight over the Pyrenees, the aircraft's path deviated from its original course, looping west and then east through the Pineta Valley. GPS and radar data indicate that while the aircraft initially maintained adequate ground clearance, it experienced a precipitous descent of approximately 6,800 feet per minute during a right-hand turn in its final minute of flight. The aircraft impacted the terrain at an altitude of approximately 1,150 meters, resulting in the death of the pilot and the total destruction of the aircraft.
The investigation
The CIAIAC investigation examined the aircraft's flight path using GPS data and ATC radar records, which corroborated the aircraft's erratic maneuvers over the mountains. The investigation included a technical inspection of the Lycoming IO-320-D1B engine and propeller, which showed no mechanical malfunctions or power loss prior to the impact.
Investigators also analyzed meteorological data, which revealed the presence of a weather front, heavy icing forecasts between FL100 and FL200, and significant cloud cover along the Spanish border. The investigation also reviewed the pilot's experience and flight planning, noting that while the pilot was highly experienced on this specific aircraft type, this was his first time navigating this specific route as pilot in command.
Findings
- The Lancair FB320 was not equipped with an anti-icing system, making it technically unsuitable for the icing conditions present.
- Meteorological reports indicated heavy icing and significant cloud masses along the southern face of the Pyrenees.
- The pilot's flight planning was inadequate, as the chosen flight levels placed the aircraft directly within forecast icing zones.
- The pilot's deviation from the usual route (which typically avoids the mountains via Biarritz) led him into unfamiliar terrain under adverse weather.
- The most probable cause of the accident was a loss of lift due to icing.