What happened
On August 8, 2014, an SA 318C Alouette II helicopter, registration I-PAAD, crashed in the municipality of Gaby, Italy. The flight, which was of a tourist nature, had previously transported passengers from Niel to the Ruck alpine pasture. After dropping off the passengers, the pilot began the return leg toward Quincinetto.
Shortly after departing from the alpine pasture at approximately 16:30 UTC, the aircraft entered the Niel Valley. During this transit, the weather conditions deteriorated rapidly. While the pilot had previously flown through the valley with better visibility, a sudden onset of low clouds and fog significantly obscured the terrain. While maneuvering through the valley, the helicopter struck a steep, wooded mountainside at an altitude of approximately 1500 meters AMSL. The impact destroyed the aircraft, and both occupants—the pilot and one passenger—were killed.
The investigation
An investigation by the ANSV examined the wreckage, meteorological data, and witness testimonies. Investigators analyzed the impact site, which was a granite slope with a 60-degree incline. Evidence from the vegetation and the wreckage indicated that the helicopter was in a right-hand turn at the moment of impact, with a bank angle of approximately 35 degrees.
Witnesses on the ground provided critical context, noting that while the weather was manageable during the initial flight segments, visibility dropped sharply in the middle section of the valley near Chanton. One witness reported hearing the sound of the helicopter hovering or maneuvering within the clouds, followed by a loud crash. Technical analysis of the wreckage confirmed that the engine and main rotor were functioning normally at the time of the accident and that the aircraft had been properly maintained.
Findings
- The primary cause of the accident was the pilot's loss of situational awareness due to inadequate flight management when visibility suddenly deteriorated.
- The pilot likely attempted to execute a right-hand turn to return to the clearer weather conditions previously encountered, but because the aircraft had drifted off the original flight path, the maneuver led into the mountainside.
- Contributing factors included a failure to recognize the severity of the changing weather conditions and a possible sense of complacency due to the pilot's familiarity with the local terrain.
- The sudden presence of low clouds and fog in the central part of the valley made visual flight conditions impossible, yet the flight continued into the obscured area.