Federal Aviation Administration August 4, 2010 – Federal Register Recent Federal Regulation Documents

We are revising an earlier NPRM for the products listed above. This action revises the earlier NPRM by expanding the scope. This proposed AD results from mandatory continuing airworthiness information (MCAI) originated 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:

We are revising an earlier proposed airworthiness directive (AD) for certain Model 747 airplanes and Model 767 airplanes. The original NPRM would have required revising the airplane flight manual (AFM) to advise the flightcrew to use certain procedures during descent in certain icing conditions. The original NPRM resulted from reports of several in-flight engine flameouts, including multiple dual engine flameout events and one total power loss event, in ice-crystal icing conditions. This action revises the original NPRM by revising the text of the proposed AFM revision. We are proposing this supplemental NPRM to ensure that the flightcrew has the proper procedures to follow in certain icing conditions. These certain icing conditions could cause a multiple engine flameout during flight with the potential inability to restart the engines, and consequent forced landing of the airplane.

These special conditions are issued for the Bombardier Inc. Model CL-600-2E25 Series Airplane. These airplanes will have a novel or unusual design feature associated with seats that include non- traditional, large, non-metallic panels that would affect survivability during a post-crash fire event. The applicable airworthiness regulations do not contain adequate or appropriate safety standards for this design feature. These 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.