Southwest Airlines Co clashed with engine-maker CFM over the timing and cost of proposed inspections after a 2016 engine accident, months before the explosion this week of a similar engine on a Southwest jet that led to the death of a passenger, public documents showed. The proposed inspections would have cost $170 per engine for two hours of labor, for a total bill to U.S. carriers of $37,400, the U.S. Federal Aviation Administration said in its August 2017 proposal, citing the engine manufacturer. The documents reveal that airlines including Southwest thought the FAA had "vastly understated" the number of engines that would need to be inspected - and therefore the cost.



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