History of the Flight
On 2 June 2001, three aircraft belonging to a Bournemouth-based company—a Sea Vixen, a Venom, and a Vampire—planned to fly to Biggin Hill for a flying display. The Vampire, a DH115 Vampire T11 registered G-DHAV, carried a passenger for air-to-air video during the transit flight. After a routine formation flight, the aircraft split for individual landings. The Sea Vixen and Vampire landed normally, but the Venom landed with its wheels up, blocking the runway for about three hours. The Vampire pilot assisted with recovery before attending the airshow briefing. Due to the Venom accident, the display schedule was changed: the Sea Vixen and Vampire would perform a short pair sequence followed by individual displays. The Vampire carried a safety pilot in the right seat, authorized by the Civil Aviation Authority.
The planned display sequence involved the aircraft taking off separately, joining as a pair, and performing a level 405° left turn. Afterwards, the Sea Vixen would execute a wing-over to the right, followed by the Vampire with a delay to achieve separation. The Vampire would then perform a solo display. Both pilots had flown a similar sequence a week earlier at Duxford.
During the actual display, the Vampire took off about 30 seconds after the Sea Vixen due to a transient landing gear problem. After joining, the pair flew past the crowd and executed the left turn. The Sea Vixen then pulled up for its wing-over, while the Vampire moved left to fly a wider radius turn followed by a right wing-over. As the Vampire reached its planned 80° of bank to enter the wing-over, it continued rolling to the right, became inverted, and entered a steep descent. It briefly rolled to wings-level but continued rolling right. At 1802 hrs local time, the aircraft impacted the ground. Both pilots suffered fatal injuries. No radio transmissions were received from the Vampire pilot.
Witness and Video Evidence
Numerous video recordings from the public showed a competent display until the separation. One digital video captured the Vampire's final moments. Frame-by-frame analysis revealed a 5-second descent from approximately 1,500 feet. The aircraft initially descended with increasing right bank at 18°, became inverted in a 56° descent 2.6 seconds later, then rolled to wings-level 1.6 seconds after that. Impact occurred within a second, with the aircraft still rolling right. The roll rate from inverted to wings-level was 112° per second. At the start of the roll, the Vampire was about 550 feet behind the Sea Vixen.
Aircraft History
G-DHAV was built in 1955 as a DH115 Vampire T11 and entered RAF service as XH308 in 1956. After retirement in 1962, it was stored until 1967, then sold to the Swiss Flugwaffe and upgraded to export Mk 55 standard as U-1234. It operated until 1991 and returned to the UK in 1995.
Wreckage Examination
The aircraft crashed in a field north of Runway 03/21, about 850 metres from the runway end. It was destroyed, with debris scattered over 130 metres. Ground scars indicated impact direction of approximately 130° magnetic, 45° nose-down, and vertically banked right. The aircraft was equipped with Martin-Baker Mk 3B ejection seats, which had not been initiated before impact. The left seat's firing guns fired after impact disruption. The cockpit canopy had not been jettisoned. The engine showed signs of rotation, but power could not be assessed. The aircraft was structurally intact at impact with flaps and gear retracted; control system failures were consistent with crash loads.
Aerodynamic Study
Given the possibility of a wake vortex encounter, the AAIB commissioned an aerodynamic study. Using the horseshoe vortex approximation, researchers modeled the Sea Vixen with a mass of 14,784 kg at 270 kt. They considered that the large disparity in operating weights between the Sea Vixen and Vampire, combined with both aircraft being banked in a turn (generating additional wing lift and vortex strength), made vortex encounter a plausible factor. Practical and theoretical studies showed that in certain regimes of disturbed air behind larger aircraft, the Vampire could experience roll disturbances exceeding its aileron control authority.