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Federal Register Highlights – 11/26/13

November 26, 2013

Unpublished, time-sensitive and proposed rules for November 26, 2013:

TEMPORARY RULE: The Coast Guard has issued a temporary deviation from the operating schedule that governs the State Highway 4 Drawbridge across Old River, mile 14.8 between Victoria Island and Byron Tract, CA. The deviation is necessary to allow the bridge owner to make critical repairs to the bridge gears. This deviation allows the bridge to remain in the closed-to-navigation position during the deviation period. This deviation is effective without actual notice from November 26, 2013 until December 6, 2013.

RULE: We are adopting a new airworthiness directive (AD) for Rolls-Royce plc (RR) RB211–535E4–37, –535E4–B–37, –535E4–C–37, RB211Trent 768–60, 772–60, and 772B– 60 turbofan engines. This AD requires removal of certain high-pressure (HP) and intermediate-pressure (IP) turbine discs before their accumulated cyclic lives have reached the revised limits. This AD was prompted by a report of an HP disc contaminated with a steel inclusion. We are issuing this AD to prevent failure of the HP or IP turbine disc, uncontained engine failure, and damage to the airplane. This AD becomes effective December 11, 2013.

RULE: We are adopting a new airworthiness directive (AD) for all Rolls-Royce plc (RR) RB211 Trent 553–61, 553A2–61, 556–61, 556A2–61, 556B–61, 556B2–61, 560–61, and 560A2–61 turbofan engines. This AD requires replacement or repair of the low-pressure (LP) compressor fan blade set before reaching a specified number of flight cycles since new (FCSN) or flight cycles since last leading edge profile blade repair (FCSLR). This AD was prompted by reports of erosion of the leading edge profile of the LP compressor blade set contributing to fan blade flutter. We are issuing this AD to prevent failure of the LP compressor blades, which could lead to an uncontained engine failure and damage to the airplane. This AD becomes effective December 11, 2013.

 

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