Text in force at CS23-6: from CS23-5, effective 15 Aug 2017.
An applicant who requests certification for flight in icing conditions must show the following in the icing conditions for which certification is requested:
(a) the ice protection system provides for safe operation; and
(b) the aeroplane design must provide protection from stalling when the autopilot is operating.
ED Decision 2017/013/R · Source