The main cause identified for the crash of VH-TVC, a Vickers Viscount 720 operated by Ansett-ANA, was the in-flight failure of the starboard outer wing due to tensile overloading of the lower spar in upward bending. This structural failure led to the aircraft breaking up in mid-air and subsequently crashing into Botany Bay shortly after taking off from Sydney. The investigation concluded that the probable cause was related to the wing's structural integrity, as stated in various sources including the Airways Museum, the Aviation Safety Network, and the Bureau of Aircraft Accidents Archives http://airwaysmuseum.com/Vickers%20Viscount%20VH-TVC.htm, https://asn.flightsafety.org/asndb/333439, and https://www.baaa-acro.com/sites/default/files/import/uploads/2017/11/VH-TVC.pdf.
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