What happened
On 21 April 2007, a Bell 206 B3 helicopter, registration ZS-RIF, was conducting a series of private flight exercises in an open field approximately 3 nautical miles south of Grand Central Aerodrome. The pilot had flown from Lanseria International Aerodrome with the intention of performing various maneuvers, including hovering and touch-and-go landings, near a local quarry.
While performing a training exercise, the pilot attempted to transition from a hover in ground effect to a forward flight. During this maneuver, the aircraft began to yaw unexpectedly. Despite attempts to correct the movement using the rudder pedals and cyclic control, the helicopter experienced a violent yaw and roll. The aircraft'-s nose pitched upward and the helicopter began to move in reverse before ultimately flipping over. The impact resulted in substantial damage to the airframe, including the main rotor mast, transmission platform, and tail boom. The pilot sustained minor injuries and was hospitalized for observation.
The investigation
SACAA AIID investigators examined the wreckage and the site to determine the sequence of events. Physical evidence at the scene, specifically ground scars, confirmed that the tail stinger and both landing gear heels made contact with the earth during the aircraft's backward movement.
Technical inspections of the engine and airframe were conducted by an approved maintenance organization. The engine manufacturer confirmed that the engine was operational at the time of impact and showed no evidence of any mechanical failure prior to the accident. Furthermore, all inspected flight control systems and components showed that the damage was strictly a result of the impact sequence rather than pre-existing defects.