About a month after issuing requirements to upgrade software on CFM International Leap-1A engines, EASA has mandated similar actions for the -1B variant due to similar designs. The airworthiness directive (AD), effective Nov. 27, requires updating the electronic engine control and engine health-monitoring software as described in a CFM service bulletin issued Oct. 24, and another dated Oct. 30. The original Leap-1A AD stems from issues Denver-based Frontier Airlines had in January with its ...

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