Word: bulkheads
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With the air pressure that had built up in the cabin and cockpit as the plane climbed, the aft bulkhead buckled, apparently because of an almost invisible 12-in. crack. The sudden decompression blew off the entire nonpressurized tail cone-a lO-ft.-long metal shell serving mainly to streamline the fuselage...
...bulkhead problem was not a new one for the DC-9. McDonnell Douglas warned airlines three years ago that fatigue cracks had shown up in some early models of the plane. The manufacturers advised airlines to inspect the bulkheads more frequently or reinforce all of these early-model DC-9s with "doubler" pieces...
...Canada had increased its inspections, but its mechanics overlooked the crack in the Boston plane until they re-examined old X rays of the bulkhead after the accident. Last week the FAA ordered U.S. carriers to make a special inspection of their...
...YORK--Air Canada officials said yesterday a crack in a pressure bulkhead apparently caused a DC-9 jet to lose part of its tail section during a flight over the Atlantic Monday...
...that we did cause the crack." But he suggested that the problem could have originated with metal wedges used by the manufacturer to align parts that had not fitted exactly when the aircraft was built Said he: "It may be that the existence of shims in the aft bulkhead created an interference fit that made the creation of the crack inevitable, no matter what procedure was used...