FAA Amends Appendix C in Icing Regulations

Aviation International News » September 2007
August 29, 2007, 8:52 AM

The FAA last month released a final rule governing certification of transport-category (Part 25) airplanes for operation in icing conditions. The new rule, which takes effect October 9, effectively added new material to Part 25, Appendix C, the section that details the so-called icing envelope. The new rules add specific requirements for airplane performance and handling qualities in icing conditions, whereas the existing rule specified only that airplanes be able to operate “safely in icing conditions if the applicant is seeking to certificate ice-protection features.” The agency isn’t finished with Appendix C and wrote, “We are considering future rulemaking action to address icing conditions beyond those covered by Appendix C of Part 25, and to provide flight crews with a means to positively determine when they are in icing conditions that exceed the limits for aircraft certification.”

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