Summary
The FAA is withdrawing a notice of proposed rulemaking (NPRM). That NPRM proposed a new airworthiness directive (AD) that applies to certain Rolls-Royce plc (RR) models RB211-535C-37, RB211-535E4-37, RB211-535E4-B-37, and RB211-535E4-B-75 turbofan engines. The NPRM had applied to those engines with radial drive steady bearing part number (P/N) LK76084 installed, with fewer than 3,000 engine operating hours on the bearing. That proposed action would have required initial and repetitive visual inspections of the engine oil scavenge filter for evidence of radial drive steady bearing failure. If after finding evidence, the proposed action would have required a visual inspection of the radial drive steady bearing for damage and evidence of bearing debris. Since we issued that NPRM, RR notified us that all at-risk radial drive steady bearings are removed from service. RR also notified us that remaining bearings in service are now well over the 3,000-engine-operating-hour threshold and are no longer at risk. Accordingly, we withdraw the proposed rule.