During search and rescue operations, a helicopter hovering in mid-air can build up a significant electrostatic charge. Before a ground crew member on a ship grabs the winch hook to secure a rescue litter, they must touch the hook with a metal grounding pole connected to the ship's superstructure.
Explain how the hovering helicopter becomes electrostatically charged.
Describe a major hazard if a ground crew member grabs the winch hook before it is discharged.
State the type of electrical connection made by using the grounding pole.
Explain how using the grounding pole before handling the winch hook reduces the risk of injury.