14 C.F.R. § 23.1201 Fire extinguishing systems materials.
Title 14 - Aeronautics and Space
For commuter category airplanes, the following apply: (a) No material in any fire extinguishing system may react chemically with any extinguishing agent so as to create a hazard. (b) Each system component in an engine compartment must be fireproof. [Amdt. 23–34, 52 FR 1833, Jan. 15, 1987; 52 FR 7262, Mar. 9, 1987]
Title 14: Aeronautics and Space
PART 23—AIRWORTHINESS STANDARDS: NORMAL, UTILITY, ACROBATIC, AND COMMUTER CATEGORY AIRPLANES
Subpart E—Powerplant
Powerplant Fire Protection
§ 23.1201 Fire extinguishing systems materials.