544 

14 CFR Ch. I (1–1–24 Edition) 

§ 27.1145 

§ 27.1145

Ignition switches. 

(a) There must be means to quickly 

shut off all ignition by the grouping of 
switches or by a master ignition con-
trol. 

(b) Each group of ignition switches, 

except ignition switches for turbine en-
gines for which continuous ignition is 
not required, and each master ignition 
control must have a means to prevent 
its inadvertent operation. 

(Secs. 313(a), 601, and 603, 72 Stat. 752, 775, 49 
U.S.C. 1354(a), 1421, and 1423; sec. 6(c), 49 
U.S.C. 1655(c)) 

[Doc. No. 5074, 29 FR 15695, Nov. 24, 1964, as 
amended by Amdt. 27–12, 42 FR 15045, Mar. 17, 
1977] 

§ 27.1147

Mixture controls. 

If there are mixture controls, each 

engine must have a separate control 
and the controls must be arranged to 
allow— 

(a) Separate control of each engine; 

and 

(b) Simultaneous control of all en-

gines. 

§ 27.1151

Rotor brake controls. 

(a) It must be impossible to apply the 

rotor brake inadvertently in flight. 

(b) There must be means to warn the 

crew if the rotor brake has not been 
completely released before takeoff. 

[Doc. No. 28008, 61 FR 21907, May 10, 1996] 

§ 27.1163

Powerplant accessories. 

(a) Each engine-mounted accessory 

must— 

(1) Be approved for mounting on the 

engine involved; 

(2) Use the provisions on the engine 

for mounting; and 

(3) Be sealed in such a way as to pre-

vent contamination of the engine oil 
system and the accessory system. 

(b) Unless other means are provided, 

torque limiting means must be pro-
vided for accessory drives located on 
any component of the transmission and 
rotor drive system to prevent damage 
to these components from excessive ac-
cessory load. 

[Amdt. 27–2, 33 FR 964, Jan. 26, 1968, as 
amended by Amdt. 27–20, 49 FR 6849, Feb. 23, 
1984; Amdt. 27–23, 53 FR 34214, Sept. 2, 1988] 

P

OWERPLANT

F

IRE

P

ROTECTION

 

§ 27.1183

Lines, fittings, and compo-

nents. 

(a) Except as provided in paragraph 

(b) of this section, each line, fitting, 
and other component carrying flam-
mable fluid in any area subject to en-
gine fire conditions must be fire resist-
ant, except that flammable fluid tanks 
and supports which are part of and at-
tached to the engine must be fireproof 
or be enclosed by a fireproof shield un-
less damage by fire to any non-fire-
proof part will not cause leakage or 
spillage of flammable fluid. Compo-
nents must be shielded or located so as 
to safeguard against the ignition of 
leaking flammable fluid. An integral 
oil sump of less than 25-quart capacity 
on a reciprocating engine need not be 
fireproof nor be enclosed by a fireproof 
shield. 

(b) Paragraph (a) does not apply to— 
(1) Lines, fittings, and components 

which are already approved as part of a 
type certificated engine; and 

(2) Vent and drain lines, and their fit-

tings, whose failure will not result in, 
or add to, a fire hazard. 

(c) Each flammable fluid drain and 

vent must discharge clear of the induc-
tion system air inlet. 

[Doc. No. 5074, 29 FR 15695, Nov. 24, 1964, as 
amended by Amdt. 27–1, 32 FR 6914, May 5, 
1967; Amdt. 27–9, 39 FR 35462, Oct. 1, 1974; 
Amdt. 27–20, 49 FR 6849, Feb. 23, 1984] 

§ 27.1185

Flammable fluids. 

(a) Each fuel tank must be isolated 

from the engines by a firewall or 
shroud. 

(b) Each tank or reservoir, other 

than a fuel tank, that is part of a sys-
tem containing flammable fluids or 
gases must be isolated from the engine 
by a firewall or shroud, unless the de-
sign of the system, the materials used 
in the tank and its supports, the shut-
off means, and the connections, lines 
and controls provide a degree of safety 
equal to that which would exist if the 
tank or reservoir were isolated from 
the engines. 

(c) There must be at least one-half 

inch of clear airspace between each 
tank and each firewall or shroud iso-
lating that tank, unless equivalent 

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