FAA will issue an airworthiness directive (AD) in the next two weeks requiring inspections of certain CFM56-7B turbofan engines, the US agency announced one day after the Southwest Airlines Boeing 737-700 engine failure. “The directive will require an ultrasonic inspection of fan blades when they reach a certain number of takeoffs and landings. Any blades that fail the inspection will have to be replaced,” FAA said in a statement released on the evening of April 18. Southwest ...

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