The survey aircraft
The aircraft is a de Havilland DHC-6 Twin Otter plane operated by the specialist survey company, Sander Geophysics Ltd, based in Canada. The white, twin propeller plane has a red tail, black stripe, and registration number C-GSGF.
The aircraft is equipped with three geophysical instruments which measure the magnetism, radioactivity and conductivity of the Earth below. It undertakes measurements as it flies at a speed of approximately 130 mph (approx 216km/h).
The aircraft flies at 60 m (196 ft) above ground level, which is approximately 8 times the height of a two-storey house. Survey lines are flown at a spacing of 200 m. When the aircraft is flying at survey height it’s sound is similar to that of a passing lorry.