Airworthiness Directives; Rolls-Royce plc Turbofan Engines

We propose to supersede airworthiness directive (AD) 2014-24- 08 that applies to all Rolls-Royce plc (RR) RB211-535E4-37, RB211- 535E4-B-37, and RB211-535E4-C-37 turbofan engines with certain low- pressure (LP) fuel filter-to-high-pressure (HP) fuel pump tube assemblies, or HP fuel pump-to-fuel flow governor (FFG) or FFG-to-HP pump inlet overspill return tube assemblies and flanged adaptor installed. AD 2014-24-08 requires replacing certain LP fuel filter-to- HP fuel pump tube assemblies. Since we issued AD 2014-24-08, fuel leaks have occurred at the flanged joints of the HP fuel pump-to-FFG tube assembly and FFG-to-HP pump inlet overspill return tube assembly. This proposed AD would retain the original AD requirements and also require installation of new HP fuel pump-to-FFG and FFG-to-HP pump inlet overspill return tube assemblies and flanged adaptor. We are proposing this AD to correct the unsafe condition on these products.