Federal Aviation Administration March 2, 2009 – Federal Register Recent Federal Regulation Documents

This action proposes to establish Class E airspace at Rushville, NE. Controlled airspace is necessary to accommodate new Standard Instrument Approach Procedures (SIAPs) at Modisett Airport, Rushville, NE. The FAA is taking this action to enhance the safety and management of Instrument Flight Rules (IFR) aircraft operations at Modisett Airport.

The Federal Aviation Administration (FAA) announces its findings on the Noise Compatibility Program submitted by the Mobile Airport Authority under the provisions of 49 U.S.C. (the Aviation Safety and Noise Abatement Act, hereinafter referred to as ``the Act'') and 14 CFR Part 150. These findings are made in recognition of the description of Federal and non-Federal responsibilities in Senate Report No. 96-52 (1980). On May 1, 2006, the FAA determined that the noise exposure maps submitted by the Mobile Airport Authority under Part 150 were in compliance with applicable requirements. On October 26, 2006, the FAA approved the Mobile Regional Airport noise compatibility program. Most of the recommendations of the program were approved. On August 29, 2008, the Mobile Airport Authority requested approval to revise two of the ten approved proposed action measures.

The FAA proposes to supersede an existing airworthiness directive (AD) for certain RR RB211-524 series turbofan engines. That AD currently requires initial and repetitive borescope inspections of the head section and meterpanel assembly of the combustion liner, and replacement if necessary with serviceable parts. This proposed AD would require those same inspections, and replacement if necessary with serviceable parts. This proposed AD would also add more part number (P/ N) combustion liners to the applicability of this proposed AD. This proposed AD results from an inquiry submitted by an operator, which resulted in RR performing a complete review of the affected front combustion liner part numbers. We are proposing this AD to prevent deterioration of the engine combustion liner, which can result in combustion liner breakup, case burn-through, engine fire, and damage to the airplane.