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Deck lock
This system uses a metallic grid built into the deck and a harpoon fixed to the helicopter From Wikipedia, the free encyclopedia
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Deck lock is one of several systems for automatically securing rotorcraft on the Helicopter decks of small ships.[1]

When the helicopter lands in such a way that the helicopter's harpoon is above the grid, the harpoon secures itself automatically to the grid through hydraulic actuators.
A deck lock system was in use by the Royal Navy with its Westland Lynx aircraft, and presently with its AgustaWestland AW159 Wildcat helicopters.
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