The MacRobertson Miller Airlines Flight 1750 crash was caused by a combination of factors, primarily related to metal fatigue in the aircraft's structure. According to the Australian Department of Civil Aviation and British Aircraft Corporation investigation, the fatigue endurance of the starboard inner main spar lower boom was substantially reduced due to a flawed repair from a previous accident. This repair involved the insertion of a flared lap joint that was not up to the required standards. The aircraft's wing failed in flight, leading to a stall from which the pilots could not recover. The weather was benign at the time of the accident, so it was not a contributing factor. The crash remains a significant event in Australia's aviation history, prompting changes in aircraft maintenance and inspection procedures.
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