Airworthiness Directives; Rolls-Royce Deutschland Ltd & Co KG Models BR700-710A1-10 and BR700-710A2-20 Turbofan Engines

This amendment supersedes an existing airworthiness directive (AD), that is applicable to Rolls-Royce Deutschland Ltd & Co KG (RRD) (formerly Rolls-Royce Deutschland GmbH, formerly BMW Rolls-Royce GmbH) models BR700-710A1-10 turbofan engines with fan disc part numbers (P/ Ns) BRR18803, BRR19248, or BRR20791 installed, and BR700-710A2-20 turbofan engines with fan discs P/Ns BRR19248 or BRR20791 installed. That AD currently requires initial and repetitive inspections of these fan discs for cracks, and if necessary replacement with serviceable parts. This amendment requires the same inspections but with longer intervals between repetitive inspections under certain conditions, and requires removal of any dry film lubricant coating from the front face of the fan disc for visual inspections. This amendment is prompted by reevaluation by RRD of results from a fleet-wide inspection campaign, reevaluation of existing repetitive inspection interval requirements, and by a revised service bulletin (SB) that introduces improved inspection procedures. The actions specified by this AD are intended to detect cracks in the fan disc, that could result in an uncontained engine failure and damage to the airplane.