What happened
On 31 October 2022, a Scintex CP301-C1, registration G-CKCF, was performing a private flight from Rochester to Goodwood. Following a standard engine check and taxi, the aircraft commenced takeoff from Runway 20R. While the initial climb appeared normal, the aircraft's flight path became noticeably low as it approached a wooded ridge south of the airfield.
During the climb, the pilot noted a reduction in engine speed, and the passenger observed a drop in RPM. The aircraft then encountered turbulence that triggered an incipient spin. The pilot managed to regain wings-level flight by applying nose-down elevator and opposite rudder, but the aircraft ultimately settled into a tree canopy. Despite the impact, the cabin remained intact, and both occupants escaped without injury.
The investigation
The investigation examined the aircraft's weight, engine performance, and environmental conditions. While the pilot believed the engine was running smoothly during the pre-flight check, investigators noted that the ambient temperature and dewpoint were within a range highly conducive to severe carburettor icing.
Furthermore, the investigation reviewed the aircraft's mass. Although the pilot's calculations suggested a weight near the limit, the actual weight of the fuel and additional items likely pushed the Scintex CP301-C1 above its 650 kg maximum takeoff weight. The investigation also considered the runway conditions; while the pilot reported a dry surface, evidence suggested the grass was wet and soft, which would significantly increase the required takeoff ground roll.
Findings
- The aircraft likely exceeded its maximum takeoff weight for the departure.
- Engine power may have been reduced by the formation of carburettor ice.
- The takeoff ground run required may have exceeded the available runway length due to the combination of an uphill slope, wet grass, and soft ground.
- The aircraft lacked the necessary performance to clear obstacles in its takeoff flight path.