C.F.R. » Title 14 » CHAPTER I—FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION › SUBCHAPTER C—AIRCRAFT › PART 29—AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY ROTORCRAFT › Subpart E—Powerplant

14 C.F.R. § 29.1157

Carburetor air temperature controls

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There must be a separate carburetor air temperature control for each engine.