What happened
On 13 May 2023, a Piper PA-1el-150, registration G-CLYI, was participating in a short takeoff and landing (STOL) event at Sleap Aerodrome in Shropshire. The aircraft, a tailwheel type modified with large bush wheels and a large propeller for enhanced performance, was performing a STOL maneuver on a grass strip located at the left edge of Runway 18.
Following touchdown on the main wheels, the pilot applied gentle braking to minimize the landing distance. As the aircraft's speed dropped below 10 knots, the wind shifted to a light tailwind, causing the tail to lift further. The pilot attempted to use a burst of throttle to raise the nose, but the maneuver was unsuccessful. As the tail continued to rise, the propeller struck the ground, causing the aircraft to pitch forward onto its nose and subsequently onto its back. The pilot, who was the sole occupant, exited the aircraft without injury.
The investigation
The investigation examined the sequence of the landing and the management of the STOL event. Video evidence captured the moment the aircraft overturned, showing adjudicators positioned near the aircraft. The investigation also reviewed the airfield's safety management and the positioning of personnel during the event.
It was noted that the grass strip used for the maneuver was part of the runway edge strip for Runway 18. While cones were used to delineate the parking area, the use of the strip for the STOL event reduced the effectiveness of the separation measures between the aircraft and the adjudicators, who were positioned beyond the required runway edge strip limits.
Findings
- The aircraft sustained damage to the propeller, windscreen, rudder strut, and rudder.
- The accident was likely caused by braking while landing with a tailwind, which led to the loss of control.
- The pilot, acting as the airfield's accountable manager, had not delegated ground supervision responsibilities during the flight.
Safety action
Following the incident, the airfield's Safety Management System (SMS) has been updated to incorporate risk management into the planning of events. Additionally, the airfield manager has obtained Tier 1 Flying Display Director accreditation.