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(c) For airplanes certified in accordance with Sec. 25.1420(a)(1) or (2), an operating limitation must be established to:
(1) Prohibit intentional flight, including takeoff and landing, into icing conditions defined in Appendix O of this part for which the airplane has not been certified to safely operate; and
(2) Require exiting all icing conditions if icing conditions defined in Appendix O of this part are encountered for which the airplane has not been certified to safely operate.