Fire protection of structure, controls, and other parts.
Each part of the structure, controls, rotor mechanism, and other parts essential to a controlled landing that would be affected by powerplant fires must be fireproof or protected so they can perform their essential functions for at least 5 minutes under any foreseeable powerplant fire conditions.
[Amdt. 27-26, 55 FR 8001, Mar. 6, 1990]