Thanks for the replies.
Please forgive me if this is a very stupid question but - are wires hot? If so would it be possible to affix a small (less expensive) IR camera to the helicopter to assist in checking for wires.
If so then could there be a small flir ball beneath the aircraft that runs a pre-programmed sweep once you push a button in the cockpit and which covers the whole area beneath the helicopter and shows the pilot where the wires are?