Text in force at CS29-12: from CS29-0, effective 14 Nov 2003.
Each part of the structure, controls, and the rotor mechanism, and other parts essential to controlled landing and (for Category A) flight that would be affected by powerplant fires m ust be isolated under CS 29. 1191, or must be:
(a) For Category A rotorcraft, fire-proof; and
(b) For Category B rotorcraft, fire-proof or protected so that they can perform their essential functions for at least 5 minutes under any foreseeable powerplant fire conditions.
ED Decision 2003/016/RM · Source