What happened
On 22 July 2013, at approximately 1130Z, a student pilot was attempting a solo training flight from Grand Central Aerodrome in Gauteng Province. As the Robinson R44 II, registration ZS-RWL, began its lift-off from a parking bay, the aircraft experienced an uncontrolled leftward rotation. This movement was triggered by a crosswind of 8 knots.
In an attempt to stabilize the aircraft, the pilot reduced throttle according to training manual procedures. However, because the helicopter was still at a very low altitude, the tail rotor and tail guard struck the ground. The subsequent hard landing caused substantial damage to the tail rotor, the tail boom, and the skid attachment points. No injuries were reported, and the pilot was safely restrained by his harness.
The investigation
SACAA AIID investigators examined the circumstances surrounding the loss of control and the pilot's response. The investigation confirmed that the aircraft was airworthy, with all maintenance and registration certificates in order. The pilot held a valid student pilot license and a medical certificate without restrictions, though he possessed limited experience, with only 6.1 hours on this specific aircraft type.
Investigators compared meteorological data from the pilot and the Grand Central tower, noting that the wind conditions—specifically an 8-knot wind from 320°—played a critical role in the aircraft's instability during the transition to flight.
Findings
- The primary cause of the accident was poor technique during the critical lift-off phase.
- The pilot failed to adequately account for the prevailing wind conditions during the pre-flight phase.
- Improper flight planning contributed to the pilot's inability to manage the aircraft's reaction to the crosswind.
- The physical damage to the Robinson R44 II was directly caused by the tail rotor impacting the ground and the force of the hard landing.