European and US regulators have expanded a software-upgrade mandate to CFM International LEAP-1B engines that ensures Boeing 737 MAX-family aircraft will not experience engine-fan-speed issues caused by extremely cold weather. The European Aviation Safety Agency (EASA) and FAA mandates, issued Nov. 27 and Dec. 11, respectively, mirror earlier requirements that covered LEAP-1A engines that power Airbus A320neos. The latest directives require 737 MAX-family operators to upgrade ...

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