Earlier this year, one of the engines on a Boeing 787 Dreamliner flown by Japan Airlines shut down at 20,000 feet and could not be restarted. The pilots landed the plane safely on one engine, but the defect, which is caused by icing, has led to an urgent directive by the Federal Aviation Administration.

The FAA is ordering airlines to revise flight manuals to address the potential issue, as well as to rework or replace at least one engine on the Dreamliners that have the General Electric engine.

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A total of 176 planes, including 43 in the U.S., flying with 29 airlines are affected by the order. That represents about 44% of the Dreamliners in operation around the world, according to The Seattle Times.

Boeing and General Electric have been working on the issue for months, with the engine manufacturer recommending the adopted fix earlier this month.

The crew instructions must go out within the week and the engines must be fixed or replaced within the next five months, according to the Wall Street Journal.

About 40 of the affected engines have already been fixed.

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