Section 29.1151

14 CFR Ch. I (1-1-19 Edition)

Section 29.1151 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.
Section 29.1157 Carburetor air temperature
controls.
There must be a separate carburetor
air temperature control for each engine.
Section 29.1159 Supercharger controls.
Each supercharger control must be
accessible to - 
(a) The pilots; or
(b) (If there is a separate flight engineer station with a control panel) the
flight engineer.
Section 29.1163 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 prevent contamination of the engine oil
system and the accessory system.
(b) Electrical equipment subject to
arcing or sparking must be installed,
to minimize the probability of igniting
flammable fluids or vapors.
(c) If continued rotation of an enginedriven cabin supercharger or any remote accessory driven by the engine
will be a hazard if they malfunction,
there must be means to prevent their
hazardous rotation without interfering
with the continued operation of the engine.
(d) Unless other means are provided,
torque limiting means must be provided for accessory drives located on
any component of the transmission and
rotor drive system to prevent damage
to these components from excessive accessory load.

spaschal on DSK3GDR082PROD with CFR

[Doc. No. 5084, 29 FR 16150, Dec. 3, 1964, as
amended by Amdt. 29-22, 49 FR 6850, Feb. 23,
1984; Amdt. 29-26, 53 FR 34219, Sept. 2, 1988]

Section 29.1165 Engine ignition systems.
(a) Each battery ignition system
must be supplemented with a generator
that is automatically available as an

alternate source of electrical energy to
allow continued engine operation if
any battery becomes depleted.
(b) The capacity of batteries and generators must be large enough to meet
the simultaneous demands of the engine ignition system and the greatest
demands of any electrical system components that draw from the same
source.
(c) The design of the engine ignition
system must account for - 
(1) The condition of an inoperative
generator;
(2) The condition of a completely depleted battery with the generator running at its normal operating speed; and
(3) The condition of a completely depleted battery with the generator operating at idling speed, if there is only
one battery.
(d) Magneto ground wiring (for separate ignition circuits) that lies on the
engine side of any firewall must be installed, located, or protected, to minimize the probability of the simultaneous failure of two or more wires as a
result of mechanical damage, electrical
fault, or other cause.
(e) No ground wire for any engine
may be routed through a fire zone of
another engine unless each part of that
wire within that zone is fireproof.
(f) Each ignition system must be
independent of any electrical circuit
that is not used for assisting, controlling, or analyzing the operation of that
system.
(g) There must be means to warn appropriate crewmembers if the malfunctioning of any part of the electrical
system is causing the continuous discharge of any battery necessary for engine ignition.
[Doc. No. 5084, 29 FR 16150, Dec. 3, 1964, as
amended by Amdt. 29-12, 41 FR 55473, Dec. 20,
1976]

POWERPLANT FIRE PROTECTION
Section 29.1181 Designated fire zones: regions included.
(a) Designated fire zones are - 
(1) The engine power section of reciprocating engines;
(2) The engine accessory section of
reciprocating engines;
(3) Any complete powerplant compartment in which there is no isolation

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