What happened
On 1 November 2008, a Gazelle HT.MK3, registration G-CBXT, was performing a private flight from Baxterly, Staffordshire, to a maintenance facility near RNAS Yeovilton, Somerset. The flight included the pilot and two passengers. During the journey, the helicopter stopped at Norton Lindsey, Warwickshire, to collect an additional passenger.
As the aircraft progressed toward its destination, GPS data and radar tracking indicated a significant change in flight path. While the helicopter had been flying at higher altitudes, it began to descend as it approached the terrain. The final recorded GPS position showed the aircraft at 993 ft amsl, but ground marks at the accident site indicated the helicopter struck the rising terrain at approximately 850 ft amsl. The impact occurred near Langley Hill, Gloucestershire, and was followed by a substantial fire that destroyed much of the fuselage. All three occupants sustained fatal injuries.
The investigation
Investigators examined the wreckage, the engine, and the flight instruments. The engine and gearbox were found to have been functioning normally at the time of the accident, with debris in the turbine suggesting the engine was still running upon impact. The altimeter was found to be working correctly prior to the impact, and the investigation concluded that the aircraft was in a level flight attitude when it struck the ground.
Weather analysis revealed that while the sky was clear in some areas, there was likely significant cloud cover and mist over the accident site. This would have reduced visibility and likely forced the aircraft into Instrument Meteorological Conditions (IMC). The investigation also reviewed the pilot's medical history, noting that he had a history of migraines that had not been disclosed to the CAA during medical renewals.
Findings
- The helicopter likely entered IMC while flying near high ground.
- The pilot was not qualified to fly in IMC and lacked the necessary instrument training to navigate the conditions.
- The aircraft's track deviated significantly from its intended route, suggesting an attempt to regain visual conditions from an incorrect direction.
- The pilot had a history of medical conditions and medication use that, if disclosed, would have invalidated his medical certificate.