14 C.F.R. § 25.1421 Megaphones.
Title 14 - Aeronautics and Space
If a megaphone is installed, a restraining means must be provided that is capable of restraining the megaphone when it is subjected to the ultimate inertia forces specified in §25.561(b)(3). [Amdt. 25–41, 42 FR 36970, July 18, 1977]
Title 14: Aeronautics and Space
PART 25—AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY AIRPLANES
Subpart F—Equipment
Safety Equipment
§ 25.1421 Megaphones.
