包含大的过冷水滴，冻雨或混合情况的大气条件，可能超出FAR 参数和认证的防冰系统能力。
A Atmospheric conditions including large, supercooled water droplets, freezing rain or a mixture of conditions,may exceed the FAR parameters and the capabilities of the certified ice protection system.
B Atmosphere conditions which include large too cold-water drip, ice rain or a mixed conditions, may deviate the FAR specifications and the ability of the qualified anti-ice system.
C The atmospheric conditions except for large over cold water drops, frozen rain or the combination condition, may exceed the FAR data and the verified anti ice system capability.