The HELI hanger door is used to enclose the aft end of the hanger structure.
The overhead door is a rolling curtain type designed to be mounted on to a fixed structure at vertical aft bulkhead.
It consists of a series of horizontal aluminum alloy slats, which interlock to form the door curtain.
The curtain moves up and down with in channel shaped guides, which are attached to the face of the fixed structure at each side of the opening.
The guides restrain the curtain, so that it seals the opening and provides support against wind pressure.
Sealing of the door is achieved by canvasreinforced neoprene strips fastened to the vertical guides.
The door is electrically operated, and it can also be operated manually using a crank handle at deck level.
The electrical drive is located inside the hanger.