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Most cargo hatches have a coaming, a raised edge around the hatch, to help keep out water. The term batten down the hatches is used prepare the ship for bad weather. This may included securing cargo hatch covers with wooden battens, to prevent water from entering from any angle. The term cargo hatch can also be a used for any deck opening ...
Butterworth hatches are not the main access hatches, but are the servicing hatches, and are generally closed with a metal cover plate with a gasket that is fastened to the deck by a number of bolts which stick up from the deck. Holes on the edges of the plate fit over these bolts and the cover is fastened down with nuts or dogs.
Only the slide and emergency lighting on the same side of the aircraft as the open hatch will operate. However, on aircraft where there is a pair of adjacent overwing exits on both sides of the aircraft (i.e. four in total), such as on some Boeing 767-300 variants, opening one of the pair of doors will deploy the slide. Should slide inflation ...