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(b) Each static port must be designed and located so that:
(1) The static pressure system performance is least affected by airflow variation, or by moisture or other foreign matter; and
(2) The correlation between air pressure in the static pressure system and true ambient atmospheric static pressure is not changed when the airplane is exposed to the icing conditions defined in Appendix C of this part, and the following icing conditions specified in Appendix O of this part:
(i) For airplanes certificated in accordance with Sec. 25.1420(a)(1), the icing conditions that the airplane is certified to safely exit following detection.
(ii) For airplanes certificated in accordance with Sec. 25.1420(a)(2), the icing conditions that the airplane is certified to safely operate in and the icing conditions that the airplane is certified to safely exit following detection.
(iii) For airplanes certificated in accordance with Sec. 25.1420(a)(3) and for airplanes not subject to Sec. 25.1420, all icing conditions.
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