14 C.F.R. § 23.1301 Function and installation.
Title 14 - Aeronautics and Space
Each item of installed equipment must— (a) Be of a kind and design appropriate to its intended function. (b) Be labeled as to its identification, function, or operating limitations, or any applicable combination of these factors; (c) Be installed according to limitations specified for that equipment; and (d) Function properly when installed. [Amdt. 23–20, 42 FR 36968, July 18, 1977]
Title 14: Aeronautics and Space
PART 23—AIRWORTHINESS STANDARDS: NORMAL, UTILITY, ACROBATIC, AND COMMUTER CATEGORY AIRPLANES
Subpart F—Equipment
General
§ 23.1301 Function and installation.