Department of Transportation April 5, 2013 – Federal Register Recent Federal Regulation Documents

We propose to adopt a new airworthiness directive (AD) for all Rolls-Royce plc (RR) RB211-535E4-B-37 series turbofan engines. This proposed AD was prompted by recalculating the life of certain life limited parts operated to certain flight profiles. This proposed AD would require removal of affected parts using a drawdown plan. We are proposing this AD to prevent the failure of critical rotating parts, which could result in uncontained failure of the engine and damage to the airplane.

We propose to adopt a new airworthiness directive (AD) for all Rolls-Royce plc (RR) RB211-535E4-37, RB211-535E4-B-37, RB211-535E4-C- 37, and RB211-535E4-B-75 turbofan engines. This proposed AD was prompted by RR updating the low-cycle-fatigue life analysis for the low pressure turbine (LPT) stage 2 discs. This proposed AD would require removal of affected parts using a drawdown plan. We are proposing this AD to prevent LPT stage 2 disc failure, which could result in uncontained engine damage and damage to the airplane.

The U.S. New Car Assessment Program (NCAP) provides comparative information on the safety of new vehicles to assist consumers with vehicle purchasing decisions and encourage motor vehicle manufacturers to make safety improvements. To maintain the relevance and effectiveness of NCAP, NHTSA has periodically updated the program, most recently in model year 2011. In response to the rapid development of vehicle safety technologies, especially in the area of crash avoidance, the agency is once again requesting public comments in order to help identify the potential areas for improvement to the program that have the greatest potential for producing safety benefits. This notice lists and describes potential areas of study for improving NCAP. The agency will use the comments it receives to aid it in developing a notice proposing near term upgrades to NCAP. The agency will also use the comments received in response to this notice to help it in developing a draft 5- year plan for the NCAP program outlining research that the agency plans to conduct as well as longer term upgrades it intends to pursue making to NCAP.