What happened
On 23 May 2004, a Cessna 120, registration G-BRPF, was conducting a private pleasure flight from Breighton, North Yorkshire, to Sibsey Airfield in Lincolnshire. Prior to arrival, the pilot performed a low-level pass at 1,000 feet to evaluate the wind conditions via the airfield windsock, noting an east-north-east breeze of less than 5 knots. To avoid nearby power lines, the pilot opted for an approach from the east, despite a slight tailwind.
During the landing, the pilot maintained an approach speed of approximately 58 to 60 mph. Although the aircraft achieved a three-point touchdown near the start of the 400-metre grass runway, it did not decelerate sufficiently during the rollout. In an attempt to stop the aircraft, the pilot applied heavy braking, which caused the plane to tip forward onto its nose. The momentum of the aircraft resulted in it coming to rest in an inverted position near the western end of the strip. The one injury sustained was to the pilot, while the passenger remained unharmed.
The investigation
The investigation examined the aircraft's performance and the environmental conditions at the time of the accident. It was noted that the pilot was experienced on this type of aircraft and familiar with the Sibsey airfield. The investigation reviewed the pilot's post-accident calculations, which suggested that under the recorded conditions, a stopping distance of approximately 720 feet should have been sufficient. This estimate accounted for the short, dry grass surface and the presence of a tailwind.
Findings
- The aircraft sustained extensive damage to the fuselage, propeller, tailplane, and tail fin.
- The primary cause of the accident was the failure of the aircraft to stop within the available runway length.
- An unobserved increase in the strength of the tailwind during the approach likely contributed to the extended ground roll.