(Bloomberg) — Airlines flying  Boeing Co.'s 787 Dreamliner jets with the latest General Electric Co. engines were ordered to repair them, or swap out at least one with an older model, in an urgent safety directive after a recent in-flight event.

A GEnx-1B PIP2, part of a family of engines plagued by issues related to icing, suffered "substantial damage" in the Jan. 29 incident, when ice on the fan blades broke loose, the U.S. Federal Aviation Administration said in an order published Friday in the Federal Register.

"The potential for common cause failure of both engines in flight is an urgent safety issue," the FAA said in its order.

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