Originally Posted by
JimEli
To my knowledge, certification standards (Part 29 in this case) have never stipulated a 15-minute time period. Has the manufacturer stated that time period?
§29.861 Fire protection of structure, controls, and other parts.
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 must be isolated under § 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 per- form their essential functions for at least 5 minutes under any foreseeable powerplant fire conditions.
[Doc. No. 5084, 29 FR 16150, Dec. 3, 1964, as amended by Amdt. 27–26, 55 FR 8005, Mar. 6, 1990]
(And ”Fire proof” should be associated with a test flame temperature of 2000 degrees F for at least 15-minute duration...)