Federal Aviation Administration February 4, 2011 – Federal Register Recent Federal Regulation Documents
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Airworthiness Directives; General Electric Company CF6-45 and CF6-50 Series Turbofan Engines
We are superseding an existing airworthiness directive (AD) for General Electric Company (GE) CF6-45 and CF6-50 series turbofan engines with certain low-pressure turbine (LPT) rotor stage 3 disks installed. That AD currently requires initial and repetitive borescope inspections of the high-pressure turbine (HPT) rotor stage 1 and stage 2 blades for wear and damage, including excessive airfoil material loss. That AD also requires fluorescent-penetrant inspection (FPI) of the LPT rotor stage 3 disk under certain conditions and removal of the disk from service before further flight if found cracked. That AD also requires repetitive exhaust gas temperature (EGT) system checks (inspections). This AD requires HPT rotor stage 1 and stage 2 blade inspections and EGT system inspections. This AD also requires FPI of the LPT rotor stage 3 disk under certain conditions, removal of the disk from service before further flight if found cracked, and an ultrasonic inspection (UI) of the LPT rotor stage 3 disk forward spacer arm. This AD also requires initial and repetitive engine core vibration surveys and reporting to the FAA any crack findings, disks that fail the UI, and engines that fail the engine core vibration survey. This AD was prompted by reports received of additional causes of HPT rotor imbalance not addressed in AD 2010-12-10, and two additional LPT rotor stage 3 disk events. We are issuing this AD to prevent critical life-limited rotating engine part failure, which could result in an uncontained engine failure and damage to the airplane.
Notice of Availability of the Final Environmental Impact Statement (FEIS) for the Airfield Improvement Program at Palm Beach International Airport, West Palm Beach, FL
The FAA announces that the FEIS for the proposed Airfield Improvement Program (AIP) at PBIA is available for public review. The FEIS includes the Section 106 consultation with the Florida State Historic Preservation Officer (SHPO) and the Keeper of the National Register of Historic Places (Keeper) regarding the National Register eligibility of properties within the EIS Area of Potential Effect (APE) and the proposed action's potential effect to historic resources eligible for, or listed-in, the National Register of Historic Places. Pursuant to the Coastal Zone Management Act of 1972 (CZMA), as amended, the proposed AIP is being evaluated in the FEIS for consistency with the Florida Coastal Management Program (FCMP). Comments regarding the compatibility of the No-Action Alternative, the AIP, and Alternative 2 with regard to Section 106 resources and the Florida's Coastal Management Program are encouraged by the FAA. The FAA is seeking comments on those sections of the FEIS that have been updated and/or contain information that has become available since the release of the DEIS. Please see the SUPPLEMENTARY INFORMATION section below for more information. Updated information regarding the forecasts of aviation operations at PBIA became available and was published following the public availability of the September, 2008 Draft Environmental Impact Statement (DEIS). Also, Palm Beach County (the Airport Sponsor) submitted to the FAA a revised implementation plan and schedule for the proposed AIP after the publication of the DEIS. The FAA determined that this information should be considered by the agency and be disclosed to the public in the FEIS. All comments on the FEIS are to be submitted to Mr. Bart Vernace of the FAA, at the address shown in the section below entitled For Further Information or to Submit Comments Contact. The FAA is providing a forty-five (45) day comment period for the public to comment on the FEIS. The comment period begins on the date of the publication of this Notice of Availability (NOA) in the Federal Register, and will close on March 21, 2011.
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