14 CFR · Part 25

14 CFR § 25.929

Propeller deicing.

(a)

If certification for flight in icing is sought there must be a means to prevent or remove hazardous ice accumulations that could form in the icing conditions defined in Appendix C of this part and in the portions of Appendix O of this part for which the airplane is approved for flight on propellers or on accessories where ice accumulation would jeopardize engine performance.

(b)

If combustible fluid is used for propeller deicing, §§ 25.1181 through 25.1185 and 25.1189 apply.

Regulations Referenced

14 CFR Part 25, Appendix C 14 CFR Part 25, Appendix O 14 CFR 25.1181 14 CFR 25.1185 14 CFR 25.1189

Reflects the eCFR edition current as of September 29, 2026. Retrieved from ecfr.gov on October 16, 2026.

Primary Source

Official Source (14 CFR · Part 25)