When i was working near Wollongong NSW I saw a helicopter lifting and placing structural steel for a cliff top house. For whatever reason it was impractical to use a crane for that job, either ground conditions or access wouldn't allow a mobile crane.
For the Centerpoint Tower in Sydneys CBD a helicopter was used to add and later remove statues on the top of the tower.
Obviously helicopters will never replace cranes (hopefully haha) but they are a good option when access or setup for a crane is not feasible. Changing antennas or bringing up machinery on existing highrise or building towers in remote areas with no road access are just a couple of areas when you may have to look at using a helicopter.
Hand signals are used by the dogman to direct the helicopter to place the load.
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