What happened
On 6 August 2025, a Sonaca 200, registration G-LKDM, was performing a solo training flight at Blackbushe Airport. The student pilot had previously completed a successful dual circuit session with an instructor and intended to practice circuits alone. After conducting standard engine run-up checks and receiving takeoff clearance for Runway 2D, the pilot began the takeoff roll.
As the aircraft reached approximately 55 knots, it began to veer to the left. The pilot attempted to apply right rudder, but the input appeared ineffective. The aircraft subsequently departed the runway to the left, traveling onto the adjacent grass. During the excursion, the aircraft struck a large antenna located near the NDB. The impact caused the aircraft to rotate nearly 270 degrees, eventually coming to rest parallel to Runway 07. The collision caused the antenna to collapse onto the aircraft, shattering the canopy. The student pilot sustained one serious injury to the chest, believed to have been caused by impact with the control yoke.
The investigation
The investigation examined the mechanical condition of the aircraft and the pilot's actions. Post-accident inspections of G-LKDM revealed that all flight controls, the nosewheel, and the braking system were functioning normally. The aircraft sustained extensive damage, including a broken nose landing gear and severe damage to the right wing, rendering it beyond economic repair.
Investigators analyzed the aerodynamic forces at play during the takeoff roll. It was noted that the student pilot had relatively limited experience, with only 20 total flying hours. The investigation also considered the possibility that the sudden deviation from the runway centerline caused a startle response, potentially delaying the pilot's corrective maneuvers.
Findings
- The aircraft's leftward yaw was likely caused by uncompensated slipstream and torque effects inherent to propeller-driven aircraft.
- The pilot's right rudder input was insufficient to counteract the asymmetric aerodynamic forces and rolling resistance during the high-speed takeoff roll.
- The rapid acceleration of the aircraft provided a very narrow window for corrective action.
- A startle effect may have impaired the pilot's ability to respond appropriately to the deviation.