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【范围】
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This SAE Aerospace Information Report (AIR) provides various graphical displays of atmospheric
variables related to aircraft icing conditions in natural clouds. It is intended as a review of recent
developments on the subject, and for stimulating thought on novel ways to arrange and use the
available data. Included in this Report is FAR 25 (JAR 25) Appendix C, the established Aircraft Icing
Atmospheric Characterization used for engineering design, development, testing and certification of
civilian aircraft to fly in aircraft icing conditions.
1.1 Purpose:
Research on aircraft icing conditions in the atmosphere has been conducted intermittently since the
1940s. But, until recently, only the data gathered during the first few years of flight research had
been condensed into extreme value envelopes and publicized for use in the design of ice protection
systems for aircraft. One purpose of this AIR is to assemble in one document some new ideas on
displaying icing-related variables and using them for various applications.
1.2 Field of Application:
This report presents atmospheric data that describes the aircraft icing environment. The report
contains four different approaches in displaying and using the data:
1.2.1 Currently Accepted Civil Design Envelopes ("FAR-25, Appendix C").
1.2.2 U.S. Air Force Trial Design Envelopes.
1.2.3 Distance-Based Envelopes.
1.2.4 A Nomogram and Statistical Approach.strRefField
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