AAIB investigation to Quik GT450, G-DTAR
Heavy landing and go-around due to wake turbulence, Perth Airfield, 15 September 2018.
Summary:
The instructor was conducting training, flying circuits using Runway 27 at Perth Airport. During a downwind leg, a helicopter departed the airport from a pad south of the runway. The wind was estimated to be from 240° at less than 5 kt. The instructor discussed the wake turbulence risk but assessed that it would have dissipated before they reached the runway. When they encountered turbulence a few feet above the runway, the instructor applied full power, but the aircraft made heavy contact with the runway before continuing the go-around. In the circuit, he released the throttle which had become stuck at cruise power, before carrying out a successful glide landing.
CAA Safety Sense leaflet 15c 바카라 사이트śWake Vortex바카라 사이트ť and NATS Aeronautical Information Circular P 001/2015, 바카라 사이트śWake turbulence바카라 사이트ť provide pertinent information. Helicopters generate vortices radially in the hover. In forward flight, helicopters generate trailing vortices either side of the disk, much like wingtip vortices of a heavier aircraft. These descend and if they reach the ground will split and move sideways at approximately 5 kt in still air. When generated close to the ground, vortices can persist for about 80 seconds. In this case, the prevailing light winds would have been favourable for sustaining a vortex and drifting it towards the runway.
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