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【范围】
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This SAE Aerospace Information Report (AIR) identifies and summarizes the various factors that
should be considered during design, development, certification, or testing of helicopter rotor blade ice
protection systems. Although various concepts of ice protection are mentioned in this report, the text
is limited generally to those factors associated with design and substantiation of cyclic electrothermal
ice protection systems as applicable to the protection of helicopter rotor blades. Other systems are
described briefly in Appendix A. Applications consider main rotor blades, conventional tail rotor
blades, and other types of antitorque devices. The information contained in this report is also limited to
the identification of factors that should be considered and why the factor is important. Specific design,
analysis and test methodologies are not included. For additional information refer to the references
listed in 2.1.
1.1 Purpose:
The information in this AIR should be useful to designers, manufacturers, procuring agencies and
airworthiness authorities to avoid time consuming and expensive redesign due to oversight. This
document was prepared by Subcommittee AC-9C, Aircraft Icing Technology, of the Aircraft
Environmental Systems Committee with information compiled by individuals who have experience
with helicopter rotor blade ice protection design, analysis, and testing and who, in some cases, have
gained knowledge through negative results.
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