Tag: 贵族宝贝KE

first_imgSEATTLE — A National Transportation Safety Board report released Friday blamed bad workmanship for a 2011 incident when a 5-foot-long hole ripped open in the roof of a Boeing 737-300 during a Southwest Airlines flight.When the jet was assembled 15 years earlier, the drilling of the rivet holes along one side of the fuselage skin panel that tore away “showed a lack of attention to detail and extremely poor manufacturing technique,” the report concluded.The work also “was not in accordance with Boeing specifications or standard manufacturing practices.”The NTSB said evidence indicates the hidden cracks emanating from the rivet holes had been slowly growing with each take-off and landing, and had started “approximately when the airplane entered service” in 1996. But the safety agency’s report suggests this may have been a one-off error by a mechanic.In a statement, Boeing pointed to the NTSB finding that subsequent inspections of other 737s found no similar damage in the same fuselage panel joints.The NTSB concluded that therefore it’s “unlikely that there was a systemic QA (quality assurance) error at the Boeing facilities.”The report reveals that a panel above the one that ripped away was replaced at some late stage of assembly and the joint between these two panels — three rows of rivet holes along the overlap — showed serious discrepancies, including noncircular holes, double-drilled holes, gaps between the rivets and the holes, and metal burrs protruding from under the rivets.last_img read more