A May 2014 Bombardier CSeries flight test aircraft fire, which grounded CSeries flight testing for more than three months, was caused by the failure of the seal on an engine oil feed tube, Canada’s Transportation Safety Board (TSB) has concluded. In its final report on the Pratt & Whitney PW1500G geared turbofan (GTF) engine fire, TSB said that “heat soaking, as a result of insufficient cooldown, caused the seal of a bearing oil feed tube to fail.” At the time of the ...

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