History of the Flight
The helicopter, registered G-BTFY, was based at Southend Airport and had been flown to Biggin Hill on 14 January 2003 for maintenance. On 17 January, the pilot, a part-time flying instructor, arranged to collect it for return to Southend. The pilot and passenger arrived at Biggin Hill around 1500 hours in rainy, misty conditions. The pilot discussed the weather with a local helicopter pilot who advised that flying had been cancelled due to poor conditions and suggested a north-easterly departure route. The pilot said he would "give it a go and come back if necessary." At 1520 hours, the Biggin Hill ATIS reported wind 190°/13 kt, visibility 3,000 metres in rain, scattered cloud at 600 feet, broken at 800 feet.
At 1532 hours, the pilot contacted ATC and requested a low-level departure to the east. ATC cleared him to depart to the east and north-east, which he read back as north-north-east. Primary radar showed the helicopter initially tracking east, then turning south-easterly. The pilot requested the latest QNH. Radar then recorded a turn to the south, then west, north-west, and finally east-north-east. The last radar return was at 1536:44 hours near Horn's Green, south of Cudham.
Witnesses saw the helicopter flying low, disappearing into cloud, and reappearing in a steep descent. One witness described hearing "blade slap" associated with hard manoeuvring. The helicopter struck the ground in a garden, on an easterly heading, slightly nose-up and banked left. It broke through a hedge into a field, caught fire. Both occupants were thrown out and showed no signs of life. An Air Ambulance pilot estimated cloudbase at 300 feet and visibility 2,000 metres.
Pilot Information
The pilot held a Private Pilot's Licence and an Assistant Flying Instructor rating, upgraded to Flying Instructor in April 2000 after instrument flying training. His total flying experience was approximately 965 hours, with 112 on type. He had no record of instrument flying beyond that required for the instructor upgrade. In the days before the accident, witnesses described his demeanour as elated.
Aircraft Information
The Bell 206B was a single-engine helicopter certified for VFR only. It was equipped with a Paravion cabin heating system and a Skyforce GPS with moving map display. The airframe had been rebuilt from components of a previously damaged aircraft and received its C of A on 30 May 2001.
Investigation
An engineering examination found no defects that could have caused the accident. Post-mortem examinations showed both occupants died of multiple injuries; toxicology found no impairing substances. The investigation concluded that the accident was probably a result of the pilot's spatial disorientation brought on by inadvertent entry into cloud.