Text in force at CS29-12: from CS29-0, effective 14 Nov 2003.
(a) Each cowling and engine com partment covering must be const ructed and support ed so that it can resist the vibration, inertia and air loads to which it may be subjected in operation.
(b) Cowling m ust m eet t he drai nage and ventilation requirements of CS 29. 1187.
(c) On rotorcraft with a diaphragm isolating the engi ne power sect ion from t he engi ne accessory section, each part of the accessory section cowling subject to flam e in case of fire in the engine power section of the powerplant must:
(1) Be fireproof; and
(2) Meet the requirem ents of CS 29.1191.
(d) Each part of t he cowling or engine compartment coveri ng subject to high temperatures due t o its nearness t o exhaust system parts or exhaust gas i mpingement m ust be fireproof.
(e) Each rotorcraft must:
(1) Be designed and const ructed so that no fi re ori ginating i n any fi re zone can enter, either through openi ngs or by burni ng t hrough external skin, any other zone or regi on where it would create additional hazards;
(2) Meet t he requi rements of sub-paragraph (e)(1) with the landing gear retracted (if applicable); and
(3) Have fireproof skin in areas subject to fl ame i f a fi re st arts i n or burns out of any designated fire zone.
(f) A means of retention for each openable or readily rem ovable panel , cowl ing, or engine or rotor dri ve sy stem coveri ng m ust be provided to preclude hazardous dam age to rotors or critical control components in the event of:
(1) Structural or m echanical failure of the normal retention means, unless such failure is extremely improbable; or
(2) Fire in a fire zone , if such fire could adversely affect the normal means of retention.
ED Decision 2003/016/RM · Source