19 October | ||
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1954: 'Metal fatigue' caused Comet crashes
The public inquiry into the Comet airliner disasters has heard that metal fatigue was the most likely cause of two recent crashes.
The first crash happened in January, when 29 passengers and a crew of six lost their lives off the Italian island of Elba. The Comet's certificate of airworthiness was withdrawn after the second crash, just three months later. Fourteen passengers and seven crew died when the plane went down off the coast near Naples.
He said the painstaking analysis of thousands of fragments of the Comet involved in the Elba crash had revealed that the damage was caused by a fault in the plane itself. In what Sir Lionel called "one of the most remarkable pieces of scientific detective work ever done", a team led by Sir Arnold Hall, director of the Royal Aircraft Establishment at Farnborough, subjected models, full-size aircraft and replicas to the most elaborate and searching tests ever carried out on an airliner. One fragment collected from the scene of the crash showed that a crack had developed due to metal fatigue near the radio direction finding aerial window, situated in the front of the cabin roof. The investigators found that a small weakness such as this would quickly deteriorate under pressure, and would rapidly lead to a sudden and general break-up of the fuselage. In tests on another Comet aircraft, Sir Lionel added, the investigators had found that up to 70% of the aircraft's ultimate stress under pressure was concentrated on the corners of the aircraft's windows. Sir Lionel said the findings of the investigation would lead to a general improvement in the safety of passenger air travel. "It will perhaps be some consolation to the relatives of those who lost their lives to feel that good may come out of evil in this way," he added. The hearings continue tomorrow.
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