14 C.F.R. § 29.1101 Carburetor air preheater design.
Title 14 - Aeronautics and Space
Each carburetor air preheater must be designed and constructed to— (a) Ensure ventilation of the preheater when the engine is operated in cold air; (b) Allow inspection of the exhaust manifold parts that it surrounds; and (c) Allow inspection of critical parts of the preheater itself.
Title 14: Aeronautics and Space
PART 29—AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY ROTORCRAFT
Subpart E—Powerplant
Induction System
§ 29.1101 Carburetor air preheater design.