Accident
On 4 August 2000, at 0920Z, a Bell 206B helicopter, registration ZS-HKP, crashed on the farm Welgevonden in the Steelpoort district, South Africa (coordinates S24°46.503' E030°17.667'). The private flight had originated from a farm in the Witriver area and was destined for a mine at Steelpoort. The pilot, who held a Private Pilot Licence, had recently purchased the helicopter and completed conversion training four days after acceptance. The helicopter had been flown to Lanseria Airport for an engine module exchange prior to the accident flight.
Weather at the time was reported as fine. The helicopter carried two occupants—the pilot and one passenger—both of whom were killed. No injuries were reported.
Witness Account
A witness on the ground observed the helicopter flying lower than usual, with main rotor blades rotating at a lower rate than expected. The witness reported that the main rotor appeared to lose rotational speed and nearly became stationary. As the helicopter continued to lose altitude, it fell almost vertically from approximately 20 meters above ground.
Investigation
Post-accident examination of the engine revealed a fractured compressor-to-turbine coupler. Investigators sought to determine the reason for the coupler failure and the ensuing engine malfunction, but differing opinions were expressed regarding the exact cause.
Probable Cause
The engine failed during flight, and the pilot was unable to execute a successful autorotation. The cause of the engine failure could not be conclusively established.