Pratt & Whitney, the U.S. manufacturer of McDonnell Douglas engines that last month developed cracks and prompted Japan Air System to cancel nearly 600 flights, has admitted there have been several in-flight engine shutdowns due to such trouble.

Mark Sullivan, a Pratt & Whitney spokesman, told Kyodo News that six incidents occurred in the past five years in which in-flight shutdowns resulted from a compressor fracture in the company’s JT8D-200 series engine but said it would not compromise the safety of the twin-engine aircraft.

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