What happened
On 23 July 2023, a private flight departing from Parys Aerodrome (FAPY) in the Free State province resulted in a serious incident involving a Grob 109B, registration ZS-UZV. During the takeoff roll on Runway 24, the pilot experienced a loss of directional control. As the tailwheel lifted from the ground, a crosswind from the right caused the aircraft to veer, resulting in the propeller blades striking the runway surface.
Despite the impact, the pilot managed to regain control, steer the aircraft back to the runway centerline, and complete the rotation. The aircraft then flew a circuit before performing a successful full stop landing back at FAPY. The pilot sustained no injuries, though a post-flight inspection revealed minor damage to the tips of the propeller blades.
The investigation
The SACAA AIID investigation confirmed that the pilot was properly licensed with a valid Commercial Pilot Licence and a current medical certificate. The aircraft was also found to be in a valid regulatory state, with a valid Certificate of Airworthiness and a recent Certificate of Release to Service.
Meteorological data indicated that at the time of the incident, the wind was blowing from the northwest at approximately 6 to 7 knots. The investigation specifically examined the wind conditions relative to the aircraft's performance capabilities. The ground speed during takeoff was recorded at approximately 54 knots, which fell within the recommended takeoff range of 48-59 knots specified in the flight manual.
Findings
- The primary cause of the incident was the loss of directional control during the takeoff phase.
- A crosswind component of approximately 5.91 knots was present during the takeoff.
- While the crosswind was within the aircraft's maximum allowable limit of 11 knots, it contributed to the instability once the tailwheel left the ground.
- The pilot failed to maintain the aircraft's heading on the runway surface during the transition to flight.