652 

14 CFR Ch. I (1–1–24 Edition) 

§ 29.1194 

supported so that it can resist the vi-
bration, inertia, and air loads to which 
it may be subjected in operation. 

(b) Cowling must meet the drainage 

and ventilation requirements of 
§ 29.1187. 

(c) On rotorcraft with a diaphragm 

isolating the engine power section from 
the engine accessory section, each part 
of the accessory section cowling sub-
ject to flame in case of fire in the en-
gine power section of the powerplant 
must— 

(1) Be fireproof; and 
(2) Meet the requirements of § 29.1191. 
(d) Each part of the cowling or engine 

compartment covering subject to high 
temperatures due to its nearness to ex-
haust system parts or exhaust gas im-
pingement must be fireproof. 

(e) Each rotorcraft must— 
(1) Be designated and constructed so 

that no fire originating in any fire zone 
can enter, either through openings or 
by burning through external skin, any 
other zone or region where it would 
create additional hazards; 

(2) Meet the requirements of para-

graph (e)(1) of this section with the 
landing gear retracted (if applicable); 
and 

(3) Have fireproof skin in areas sub-

ject to flame if a fire starts in or burns 
out of any designated fire zone. 

(f) A means of retention for each 

openable or readily removable panel, 
cowling, or engine or rotor drive sys-
tem covering must be provided to pre-
clude hazardous damage to rotors or 
critical control components in the 
event of— 

(1) Structural or mechanical 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. 

(Secs. 313(a), 601, and 603, 72 Stat. 759, 775, 49 
U.S.C. 1354(a), 1421, and 1423; sec. 6(c), 49 
U.S.C. 1655(c)) 

[Doc. No. 5084, 29 FR 16150, Dec. 3, 1964, as 
amended by Amdt. 29–3, 33 FR 970, Jan. 26, 
1968; Amdt. 29–13, 42 FR 15046, Mar. 17, 1977; 
Amdt. 29–26, 53 FR 34219, Sept. 2, 1988] 

§ 29.1194

Other surfaces. 

All surfaces aft of, and near, engine 

compartments and designated fire 

zones, other than tail surfaces not sub-
ject to heat, flames, or sparks ema-
nating from a designated fire zone or 
engine compartment, must be at least 
fire resistant. 

[Amdt. 29–3, 33 FR 970, Jan. 26, 1968] 

§ 29.1195

Fire extinguishing systems. 

(a) Each turbine engine powered 

rotorcraft and Category A recipro-
cating engine powered rotorcraft, and 
each Category B reciprocating engine 
powered rotorcraft with engines of 
more than 1,500 cubic inches must have 
a fire extinguishing system for the des-
ignated fire zones. The fire extin-
guishing system for a powerplant must 
be able to simultaneously protect all 
zones of the powerplant compartment 
for which protection is provided. 

(b) For multiengine powered rotor-

craft, the fire extinguishing system, 
the quantity of extinguishing agent, 
and the rate of discharge must— 

(1) For each auxiliary power unit and 

combustion equipment, provide at least 
one adequate discharge; and 

(2) For each other designated fire 

zone, provide two adequate discharges. 

(c) For single engine rotorcraft, the 

quantity of extinguishing agent and 
the rate of discharge must provide at 
least one adequate discharge for the 
engine compartment. 

(d) It must be shown by either actual 

or simulated flight tests that under 
critical airflow conditions in flight the 
discharge of the extinguishing agent in 
each designated fire zone will provide 
an agent concentration capable of ex-
tinguishing fires in that zone and of 
minimizing the probability of reigni-
tion. 

(Secs. 313(a), 601, 603, 604, Federal Aviation 
Act of 1958 (49 U.S.C. 1354(a), 1421, 1423, 1424), 
sec. 6(c), Dept. of Transportation Act (49 
U.S.C. 1655(c))) 

[Doc. No. 5084, 29 FR 16150, Dec. 3, 1964, as 
amended by Amdt. 29–3, 33 FR 970, Jan. 26, 
1968; Amdt. 29–13, 42 FR 15047, Mar. 17, 1977; 
Amdt. 29–17, 43 FR 50602, Oct. 30, 1978] 

§ 29.1197

Fire extinguishing agents. 

(a) Fire extinguishing agents must— 
(1) Be capable of extinguishing 

flames emanating from any burning of 
fluids or other combustible materials 

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