Section 125.147
Section 125.147

14 CFR Ch. I (1-1-19 Edition)
Section 125.155

Cowling.

(a) Cowling must be made and supported so as to resist the vibration, inertia, and air loads to which it may be
normally subjected.
(b) Provisions must be made to allow
rapid and complete drainage of the
cowling in normal ground and flight attitudes. Drains must not discharge in
locations constituting a fire hazard.
Parts of the cowling that are subjected
to high temperatures because they are
near exhaust system parts or because
of exhaust gas impingement must be
made of fireproof material. Unless otherwise specified in these regulations,
all other parts of the cowling must be
made of material that is at least fire
resistant.
Section 125.149 Engine accessory section diaphragm.
Unless equivalent protection can be
shown by other means, a diaphragm
that complies with Section 125.145 must be
provided on air-cooled engines to isolate the engine power section and all
parts of the exhaust system from the
engine accessory compartment.
Section 125.151

Powerplant fire protection.

(a) Designated fire zones must be protected from fire by compliance with
SectionSection 125.153 through 125.159.
(b) Designated fire zones are - 
(1) Engine accessory sections;
(2) Installations where no isolation is
provided between the engine and accessory compartment; and
(3) Areas that contain auxiliary
power units, fuel-burning heaters, and
other combustion equipment.
Section 125.153

Shutoff means.

(a) Each engine must have a means
for shutting off or otherwise preventing hazardous amounts of fuel, oil,
deicer, and other flammable fluids
from flowing into, within, or through
any designated fire zone. However,
means need not be provided to shut off
flow in lines that are an integral part
of an engine.
(b) The shutoff means must allow an
emergency operating sequence that is
compatible with the emergency operation of other equipment, such as
feathering the propeller, to facilitate
rapid and effective control of fires.
(c) Shutoff means must be located
outside of designated fire zones, unless
equivalent safety is provided, and it
must be shown that no hazardous
amount of flammable fluid will drain
into any designated fire zone after a
shutoff.
(d) Adequate provisions must be
made to guard against inadvertent operation of the shutoff means and to
make it possible for the crew to reopen
the shutoff means after it has been
closed.

Flammable fluids.

(a) No tanks or reservoirs that are a
part of a system containing flammable
fluids or gases may be located in designated fire zones, except where the
fluid contained, the design of the system, the materials used in the tank,
the shutoff means, and the connections, lines, and controls provide equivalent safety.
(b) At least one-half inch of clear airspace must be provided between any
tank or reservior and a firewall or
shroud isolating a designated fire zone.

Section 125.157

Lines and fittings.

(a) Each line, and its fittings, that is
located in a designated fire zone, if it
carries flammable fluids or gases under
pressure, or is attached directly to the
engine, or is subject to relative motion
between components (except lines and
fittings forming an integral part of the
engine), must be flexible and fire-resistant with fire-resistant, factoryfixed, detachable, or other approved
fire-resistant ends.
(b) Lines and fittings that are not
subject to pressure or to relative motion between components must be of
fire-resistant materials.
Section 125.159

Vent and drain lines.

All vent and drain lines, and their
fittings, that are located in a designated fire zone must, if they carry
flammable fluids or gases, comply with
Section 125.157, if the Administrator finds that
the rupture or breakage of any vent or
drain line may result in a fire hazard.

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