14 C.F.R. § 125.181 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 125—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
Subpart E—Special Airworthiness Requirements
§ 125.181 Induction system ice prevention.