What happened
On 1 February 2000, a Robinson R44, registration G-TLME, was participating in a private flight from Blackpool to Coventry. The crew, which included a helicopter instructor and a pilot undergoing type conversion, was flying in formation with a Bell 206 helicopter. The flight proceeded normally through good weather until the aircraft approached the area near Leyland.
While following the M61 motorway, the R44 commander expressed an intention to descend to 600 feet to remain clear of cloud. During a left-hand turn, the aircraft entered a cloud layer. Radio transmissions from the cockpit indicated that the crew was experiencing difficulty and requested radar vectors to assist in navigating back toward the M6. Despite the commander's attempts to climb to 1,500 feet to exit the cloud, the aircraft's flight path became erratic. The R44 subsequently struck the ground at a high descent rate near Wheelton Moor, east of Chorley. All 3 people on board—the two crew members and one passenger—were fatally injured.
The investigation
The AAIB investigation examined radar data, wreckage, and meteorological conditions. Radar tracking showed that after entering the cloud, the aircraft's groundspeed fluctuated significantly, dropping from 113 kt to 65 kt, which suggested a loss of control.
Investigators performed a detailed examination of the engine, transmission, and flight controls. No evidence of mechanical failure or pre-impact defects was found in the control systems, engine, or rotor components. The engine was found to be delivering adequate power at the time of impact. The investigation also reviewed the aircraft's instrumentation, including the attitude indicator, and found the equipment to be serviceable and capable of providing accurate reference in flight.
Findings
- The aircraft was flown into cloud inadvertently.
- The handling pilot became disorientated due to the loss of visual reference.
- The pilot's confusion regarding directional headings (east versus west) suggested a high mental workload during the encounter.
- Neither pilot was trained or qualified to fly the helicopter solely by reference to flight instruments.
- There was no evidence of any technical or mechanical failure contributing to the accident.