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A roller shutter, security shutter, coiling door, roller door or sectional overhead door is a specialized type of door or window shutter consisting of multiple horizontal slats, bars, or web systems interconnected through hinges. The mechanism involves lifting the door to open it and lowering it to close.
Bulkhead door, an angled door covering the exterior stairwell of a basement; Bulkhead flatcar, a type of rolling stock designed with sturdy end-walls to prevent loads from shifting past the ends of the car; Rear pressure bulkhead, an airtight structural feature of an aircraft
The bulkhead doors have rounded windows and a different operator side window design without a top horizontal bar. The 6000-series cars seat 64, 4 fewer than the cars built since the 2000-series. The interior was redesigned to allow for additional standing room (mostly around the center doors) and easier access to all portions of the car.
In 1985, Japan Air Lines Flight 123 crashed after a catastrophic failure of the aft pressure bulkhead. [18] The failure occurred due to faulty repair of the bulkhead after a tailstrike seven years earlier, when a single repair patch plate was incorrectly cut in two "to make it fit". Failure of the bulkhead damaged hydraulic pipes passing through.
A bulkhead is an upright wall within the hull of a ship, within the fuselage of an airplane, or a car. Other kinds of partition elements within a ship are decks and deckheads . Etymology
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