Federal Aviation Administration January 4, 2011 – Federal Register Recent Federal Regulation Documents

This action proposes special conditions for the Gulfstream GVI airplane. This airplane will have a novel or unusual design feature(s) associated with single-occupant side-facing seats. The applicable airworthiness regulations do not contain adequate or appropriate safety standards for this design feature. These proposed special conditions contain the additional safety standards that the Administrator considers necessary to establish a level of safety equivalent to that established by the existing airworthiness standards.

We propose to supersede an existing airworthiness directive (AD) that applies to General Electric Company (GE) CF6-45 and CF6-50 series turbofan engines. The existing AD requires replacing certain forward and aft centerbodies of the long fixed core exhaust nozzle (LFCEN) assembly. Since we issued that AD, we became aware that other forward and aft centerbodies are also affected. This proposed AD would add certain new centerbodies requiring replacement. This proposed AD is prompted by the discovery of more part numbers (P/Ns) of centerbodies requiring replacement. We are proposing this AD to prevent the forward and aft centerbody of the LFCEN assembly from separating from the engine, damage to the engine, and damage to the airplane.

We are rescinding an existing airworthiness directive (AD) for the products listed above. The existing AD resulted from mandatory continuing airworthiness information (MCAI) issued by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as: