What happened
On 30 April 2005, an ARV Super 2, registration G-TARV, was attempting a takeoff from a private grass airstrip at Naish Farm, near Bristol. The flight was intended to be a private trip to Dunkeswell Aerodrome.
An eyewitness observed the aircraft accelerating along the runway but noted that it appeared to be traveling slower than usual and lifting off later than normal. After becoming airborne, the aircraft banked sharply to the right. During this maneuver, the aircraft struck several 11 kV power cables and a line of trees. The impact severed the cables and caused the aircraft to invert. The pilot, who was the sole occupant, sustained fatal injuries from head and spinal trauma. There was no evidence of any mechanical failure prior to the impact.
The investigation
Investigators examined the aircraft's engine, a Hewland AE75D, and found no evidence of mechanical distress or failure. The engine's spark plugs and pistons indicated correct operation. However, the investigation noted that the aircraft's small tyre radius and a buildup of corrosion on the brake discs likely caused significant drag during the takeoff roll.
Analysis of the airstrip revealed that the 600m grass surface was unsuitable for the aircraft's requirements under the prevailing conditions. While the aircraft was within its maximum gross weight, the lack of a headwind and the length of the grass increased the required takeoff distance. Calculations indicated that the required distance to reach a safe height exceeded the available runway length.
Findings
- The ARV Super 2 struck power lines and trees because the available takeoff distance was insufficient for the aircraft's performance under the specific environmental conditions.
- The aircraft's takeoff performance was further degraded by mechanical drag caused by small wheels and brake corrosion.
- The pilot likely attempted a right-hand turn shortly after takeoff, which brought the aircraft into contact with the obstacles.
- The airstrip was unsuitable for the operation of this aircraft type given the existing meteorological conditions and runway surface.