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NTSB finds more evidence of manufacturing flaw on Southwest B737

3-May-2011 1:11 PM

US National Transportation Safety Board (NTSB) stated microscope examination revealed fatigue cracks emanating from at least 42 of the 58 rivet holes connected by the fracture in the lap joint of a piece of the B737 fuselage from Southwest Flight 812 (AINOnline, 02-May-2011).  Misshapen and misaligned rivet holes in parts of the fuselage removed from the aircraft has lent more credence to theories that a manufacturing flaw led to the eventual failure of the lap joint during an 01-Apr-2011 accident in which a five foot long tear opened in the roof of the aircraft.