Accident Overview
On 15 November 2002, at 0715Z, a Robinson R22 Beta helicopter registered ZS-RBK was engaged in a dual training flight at FAWB (Wonderboom Airport). The aircraft, operated by John Bassi Helicopters CC under Aviation Training Organisation approval CAA/0150, was conducting hovering exercises east of runway 06.
Sequence of Events
During the hover exercise, the student pilot was controlling the helicopter over the helipad. A right yaw developed, and the student inadvertently applied full right rudder input. The instructor immediately applied full left rudder to counteract the yaw, but was unable to arrest the rotation. The main rotor blades subsequently contacted the ground, causing the helicopter to roll over.
Occupants and Injuries
There were two persons on board—the student and the instructor. Neither occupant sustained injuries.
Aircraft Damage
The helicopter sustained extensive damage as a result of the rollover.
Pilot Information
The instructor held a valid commercial pilot license with an endorsement for the Robinson R22 type and a Grade III instructor rating. He possessed a valid, unrestricted medical certificate valid until 31 May 2003. His total flying experience was 1,830 hours, including 125 hours on type, with 10 hours in the previous 90 days.
Maintenance and Operator
The aircraft was maintained according to regulatory requirements and had flown 21.4 hours since its last major periodic inspection. The operating company held a valid Aviation Training Organisation approval.
Weather Conditions
The pilot reported wind from 060 degrees at 10 knots, good visibility, temperature 22°C, and 100% cloud cover at 1,500 feet.
Probable Cause
The instructor was unable to recover (arrest the yaw) after the student pilot applied full right rudder instead of left rudder to compensate for the right yaw.