In the AAC we used a home made hook, cable and spike system where as the loader gets under the machine he simply whacks the spike into the ground under the machine and puts the hook over the back of the skid thereby grounding the aircraft prior to hooking up the load. If we didn't have one then you just hang onto the plastic sheathing on the stropp and touch it to the hook first before touching the machine. Once saw a RAF loady get zapped off the top of a truck by a Chinook - not funny!!!!
