Introduction
On 18 August 2012, at 1438 UTC, a Cessna F172H Skyhawk, registration G-CGRE, was involved in an accident near Baas Hill, Hoddesdon, Hertfordshire. The aircraft was on an aerial work flight returning to Old Sarum from Durham Tees Valley. The pilot, aged 41, held a Commercial Pilot’s Licence with 782 total flying hours, 305 of which were on type. The aircraft, manufactured in 1967 (serial no. 410), was powered by a Lycoming O-360-A4M piston engine.
Flight History
Prior to departure from Durham Tees Valley, the pilot reported that the fuel tanks had been filled to maximum capacity (195 litres). Approximately 2 hours and 40 minutes after takeoff, the engine began to run rough and lose power. The pilot reported that about 70 litres of fuel should have remained in the tanks at that time.
Forced Landing
Despite the application of carburettor heat and selection of the fuel mixture to RICH, the engine continued to lose power. The pilot executed a forced landing in a field, which resulted in damage to the aircraft's nose and wings. Both the pilot and the single passenger received minor injuries and were able to exit the aircraft unassisted.
Investigation
A review of weather conditions at the time of the accident indicated the potential for moderate carburettor icing at cruise engine power settings. The pilot submitted an Aircraft Accident Report Form detailing the events.
Probable Cause
The investigation noted that it is possible that the presence of carburettor icing may have contributed to the loss of engine power.