CASE STUDY: 1 AMSTERDAM AIR CRASH

Jun 18th, 2015
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Alabama State University
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Separation of an engine from a 747-200 cargo aircraft resulted in a catastrophic aircraft accident near Amsterdam. The engine separated, together with its pylon owing to fatigue and fracture of components connecting the pylon to the wing. These components were high strength steel lugs and two "fuse pins". One fuse pin was not recovered, but the other one and the lugs were investigated to find the most probable cause and sequence of damage leading to separation. The #3 engine and pylon separated from the right wing in an outboard and rearward direction. The #3 engine hit the #4 engine, causing this engine and its pylon also to separate from the wing. During engine separation the right wing leading edge was extensively damaged. This damage, together with loss of the engines, made control of the aircraft extremely difficult and aircraft became uncontrollable and crashed into an apartment block in a suburb 13 km east of Schiphol.

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CASE STUDY: 1 AMSTERDAM AIR CRASH1.1 INTRODUCTIONSeparation of an engine from a 747-200 cargo aircraft resulted in a catastrophic aircraft accident near Amsterdam. The engine separated, together with its pylon owing to fatigue and fracture of components connecting the pylon to the wing. These components were high strength steel lugs and two "fuse pins". One fuse pin was not recovered, but the other one and the lugs were investigated to find the most probable cause and sequence of damage leading to separation. The #3 engine and pylon separated from the right wing in an outboard and rearward direction. The #3 engine hit the #4 engine, causing this engine and its pylon also to separate from the wing. During engine separation the right wing leading edge was extensively damaged. This damage, together with loss of the engines, made control of the aircraft extremely difficult and aircraft became uncontrollable and crashed into an apartment block in a suburb 13 km east of Schiphol.1.2 INVESTIATIONFig 1.1 is a schematic of the engine pylon-to-wing connections. The design incorporates six "fuse pins" which are less strong than other parts of the connections. If extreme loads occur on an engine and pylon, the fuse pins made from 4330M, a high strength low alloy steel, are supposed to shear off and allow a clean separation from the wing, thereby precluding damage to the wing and possible rupture of the wing fuel tank.Fig: 1.1 Pylon-to-wing connectionsHowever, as found in the

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