Aeronautics and Space. Part125:Certification and operations: Airplanes having a seating capacity of 20 or more passengers or a maximum payload capacity of 6,000 pounds or more; and rules governing persons on board such aircraft. Section125.211:Icing condi
(a) No pilot may take off an airplanethat has frost, ice, or snow adhering toany propeller, windshield, stabilizingor control surface; to a powerplant installation; or to an airspeed, altimeter,rate of climb, flight attitude instrument system, or wing, except thattakeoffs may be made with frost underthe wing in the area of the fuel tanksif authorized by the FAA.