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Notice of proposed rulemaking.

The Federal Aviation Administration proposes to amend the airworthiness standards for transport category airplanes concerning trim systems. For trim systems, the minimum design standard would be established. The FAA proposes to amend the airworthiness standards for transport category airplanes concerning protective breathing equipment (PBE). For PBE, the proposed standard would define design and installation requirements for portable and stationary protective breathing equipment. Adopting these proposals would eliminate regulatory differences between the airworthiness standards of the U.S. and the Joint Aviation Requirements of Europe, without affecting current industry design practices.

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