14 C.F.R. § 121.283 Induction system ice prevention.
Title 14 - Aeronautics and Space
A means for preventing the malfunctioning of each engine due to ice accumulation in the engine air induction system must be provided for each airplane.
Title 14: Aeronautics and Space
PART 121—OPERATING REQUIREMENTS: DOMESTIC, FLAG, AND SUPPLEMENTAL OPERATIONS
Subpart J—Special Airworthiness Requirements
§ 121.283 Induction system ice prevention.