History of Flight
On 2 January 2021 at approximately 0500Z, a pilot aboard an AS350-B3 helicopter, registered ZS-OXK, was preparing for departure from Cape Town International Airport (FACT) to the Cape Peninsula National Park in the Western Cape province. The flight was conducted under Part 127 of the Civil Aviation Regulations (CAR) 2011 as amended and was intended for anti-crime patrolling.
While waiting for takeoff clearance from air traffic control, the pilot momentarily removed his hand from the collective pitch lever to adjust the radio volume. This action caused the collective pitch lever to rise to its maximum position, making the cyclic control very stiff and difficult to maneuver. The pilot reported no audible warnings or illuminated warning lights in the cockpit.
The helicopter then lifted off to an altitude of approximately 30 feet above ground level. It began to yaw to the left, accompanied by a slight right roll and forward pitch. The pilot attempted to counter the yaw using the pedals, but they were ineffective. The helicopter continued to yaw through two full rotations while pitching forward with a slight right roll. Subsequently, the main rotor blades struck the ground, and the pilot lowered the collective pitch lever. The right-side skid impacted the ground, leading to a dynamic rollover to the right, with the helicopter coming to rest on its right side. A post-impact fire erupted in the engine compartment before the pilot shut down the engine and disembarked without assistance.
Injuries
The pilot sustained minor injuries during the accident sequence.
Damage to Aircraft
The helicopter was destroyed by impact forces and the post-impact fire.
Meteorological Information
The reported weather conditions at the time included wind from 200° at 7 knots, temperature 18°C, dew point 8°C, ceiling and visibility OK (CAVOK), QNH 1019 hPa, and no significant changes (NOSIG).
Probable Cause
It is probable that the pilot lost control following loss of hydraulic pressure as he omitted to release the “HYD TEST” push-button on the front centre console before cutting off the hydraulic assistance (using the ‘CUTOFF’ switch) on the collective stick.