Airworthiness Directives; Rolls-Royce plc RB211-524D4 Series Turbofan Engines

This amendment adopts a new airworthiness directive (AD) that is applicable to Rolls-Royce plc models RB211-524D4-19, -524D4-B-19, - 524D4-B-39, -524D4X-19, and 524D4X-B-19 turbofan engines with a cold stream nozzle assembly Part Number (PN) LJ32826 installed. This action requires inspection for cracks and repair of the cold stream nozzle assembly longitudinal flange. This amendment is prompted by a report of the loss of a large section of cold stream nozzle assembly in flight. The actions specified in this AD are intended to detect cracks that could result in failure of the cold stream nozzle assembly, possible release of cold stream nozzle debris from the engine, and possible damage to airplane control surfaces.