Action
Notice of proposed rulemaking (NPRM).
Summary
We propose to supersede airworthiness directive (AD) 98-07-07, which applies to all Rolls-Royce plc (RR) RB211-535E4 and RB211-535E4-B turbofan engines. AD 98-07-07 requires removing certain part number (P/ N) low-pressure (LP) fuel filter-to-high-pressure (HP) fuel pump tube assemblies and installing flexible LP fuel filter-to-HP fuel pump tube assemblies. Since we issued AD 98-07-07, we received additional reports of fuel leaks that have resulted in a number of engine in-flight shutdowns. This proposed AD would expand the applicability of AD 98-07- 07 to include the RB211-535E4-C-37 turbofan engine. We are proposing this AD to prevent loss of fuel supply to the engine, which could lead to an in-flight shutdown of one or more engines, loss of thrust control, and damage to the airplane.