What happened
On April 23, 2003, at 10:24 UTC, a Robinson R22 helicopter, registration OK-XIF, was involved in an accident at Roudnice nad Labem airport. The flight, a training mission involving an instructor and a student, had been interrupted due to increasing gusty winds. After landing, the instructor taxied the aircraft toward a refueling point.
Because another aircraft was obstructing the refueling area, the instructor instructed the student pilot to disembark and assist in pushing the stationary aircraft away. Immediately after the student exited the aircraft, a sudden gust of wind caused the nose of the helicopter to lift. The aircraft began to rotate 180 degrees to the left. Despite the instructor's immediate attempts to intervene with the controls to push the nose down and move the aircraft backward, the rotation continued. The helicopter eventually overturned onto its left side, resulting in extensive damage to the main and tail rotors, the tail boom, and the cockpit glazing.
The investigation
The ÚZPLN investigation established that the aircraft was in a valid state of airworthiness and that all mechanical components, including the engine and rotor connections, were properly maintained and functioning correctly prior to the event. The investigation focused on the sequence of events following the student's disembarkation and the impact of the prevailing meteorological conditions. The investigation also examined the physical damage to the airframe, noting that the tail rotor blades were destroyed upon contact with the ground, which subsequently led to the loss of anti-torque effectiveness and the further rotation of the main rotor blades into the terrain.
Findings
- The primary cause of the accident was a strong wind gust that the instructor was unable to counteract in time through flight controls.
- The aircraft was undergoing ground maneuvers near a refueling station when the wind caused the nose to pitch up.
- There were no injuries to the crew.
- The aircraft sustained heavy damage, estimated at approximately 1.5 million CZK, including the destruction of the main and tail rotor blades and the deformation of the tail boom.
- The meteorological conditions at the time involved winds of 10–12 knots, but the sudden gust exceeded the pilot's ability to maintain control during the ground maneuver.