WebBackground: The FAA received a report of fatigue cracks detected in the skin in section 41 of the fuselage, on an in -service Model 747 aircraft. Such cracking, unless detected and corrected, could join together and cause a loss of structural integrit y and rapid decompression of the aircraft. David Villiers WebJul 2, 1986 · Reacting to the continuing discovery of cracks in the forward area of some older Boeing 747 jumbo jets, the Federal Aviation Administration yesterday proposed an intensified program of inspection ...

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http://withmaliceandforethought.com/Airworthiness_B747-353.pdf WebFeb 12, 2002 · The section 41 mods were done because the 747 frames were made of 7000 series AL alloy. (7075?) Very strong but not able to withstand the twisting forces (brittle). The 2000 alloys are much more flexible. The doubler and tripler such as this are placed on an aircraft in places that are prone to skin cracks. Look at a 737 by the main … meet the feebles script

Life Cycle Of An Airplane - Airliners.net

WebThe China Airlines Boeing 747-200 that disintegrated in midair appears to have fatigue cracks up to 9 in. long in the rear fuselage section where the aircraft may have come apart, according to Taiwanese investigators. China Airlines Flight 611 crashed in the Taiwan Strait near the top-of-climb on May 25, killing all 225 on board ( AW&ST July 1 ... WebMay 15, 2000 · RE: 747 Section 41 Modification #10486923. My understanding of a section 41 mod is, that you replace all joints betwen the fuselage and the floor beams, as these seem to receive more stress than originally forseen by Boeing. As the whole section modification starts under the cockpit windows and goes almost to the middle of the cabin … names for a wild cat