What happened
On 25 May 1999, a DH 82A Tiger Moth, registration G-BXMN, was conducting a private local flight from a farm strip near Whalley, Lancashire. While cruising at an altitude of approximately 1,100 feet, the engine began to lose power and run unevenly. The pilot attempted to execute a forced landing on a nearby golf course, but during the maneuvering process, the engine appeared to regain power. However, after the pilot completed a 3-60 degree turn, the engine failed once more. This left the pilot with no option but to land the aircraft into a wooded area.
During the impact with the trees, the aircraft sustained severe damage. Both the pilot and the passenger sustained injuries, with the passenger suffering serious injuries and the pilot sustaining minor injuries. The investigation noted that no fire occurred following the crash.
The investigation
The investigation examined the engine performance and the mechanical state of the safety equipment. Meteorological data from Blackpool Airport indicated a temperature of +12°C and a dew point of +6°C, which are conditions known to facilitate carburettor icing at cruise power settings. Both the pilot and passenger noted that the engine symptoms were consistent with such icing.
Furthermore, the investigation looked into the failure of the restraint systems. It was determined that both Sutton-type harnesses failed during the impact. The investigation noted that many vintage aircraft, including the Tiger Moth, had been fitted with these specific harnesses, which were prone to deterioration over time.