Fifteen airlines have been warned about the risk of ice forming on Boeing's new 747-8 and 787 Dreamliner planes. The issue - affecting some types of engines made by General Electric when planes fly near high-level thunderstorms - prompted Japan Airlines to cancel two international routes. There have been six incidents since April when aircraft powered by GE engines lost power at high altitude. These are the latest technical issues to hit the Dreamliner.
Wing-maker Mitsubishi Heavy Industries Ltd notified Boeing in February of the problem, which arose after the Japanese company altered its manufacturing process.
"We are discussing with Boeing how to deal with the problem," a spokesman for Mitsubishi Heavy Industries in Tokyo said. He was unable to comment on why the company changed the manufacturing process.
The cracks have not been found on planes that are in use by airlines and therefore pose no safety risk, Boeing said, adding the problem also will not alter Boeing's plans to deliver 110 787s this year.