Section 27.1013

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

below the maximum established value.
This must be shown by flight tests.
[Doc. No. 5074, 29 FR 15695, Nov. 24, 1964, as
amended by Amdt. 27-23, 53 FR 34213, Sept. 2,
1988]

Section 27.1013 Oil tanks.
Each oil tank must be designed and
installed so that - 
(a) It can withstand, without failure,
each vibration, inertia, fluid, and
structural load expected in operation;
(b) [Reserved]
(c) Where used with a reciprocating
engine, it has an expansion space of not
less than the greater of 10 percent of
the tank capacity or 0.5 gallon, and
where used with a turbine engine, it
has an expansion space of not less than
10 percent of the tank capacity.
(d) It is impossible to fill the tank
expansion space inadvertently with the
rotorcraft in the normal ground attitude;
(e) Adequate venting is provided; and
(f) There are means in the filler opening to prevent oil overflow from entering the oil tank compartment.
[Doc. No. 5074, 29 FR 15695, Nov. 24, 1964, as
amended by Amdt. 27-9, 39 FR 35461, Oct. 1,
1974]

Section 27.1015 Oil tank tests.
Each oil tank must be designed and
installed so that it can withstand,
without leakage, an internal pressure
of 5 p.s.i., except that each pressurized
oil tank used with a turbine engine
must be designed and installed so that
it can withstand, without leakage, an
internal pressure of 5 p.s.i., plus the
maximum operating pressure of the
tank.

spaschal on DSK3GDR082PROD with CFR

[Amdt. 27-9, 39 FR 35462, Oct. 1, 1974]

Section 27.1017 Oil lines and fittings.
(a) Each oil line must be supported to
prevent excessive vibration.
(b) Each oil line connected to components of the rotorcraft between which
relative motion could exist must have
provisions for flexibility.
(c) Flexible hose must be approved.
(d) Each oil line must have an inside
diameter of not less than the inside diameter of the engine inlet or outlet. No
line may have splices between connections.

Section 27.1019

Oil strainer or filter.

(a) Each turbine engine installation
must incorporate an oil strainer or filter through which all of the engine oil
flows and which meets the following requirements:
(1) Each oil strainer or filter that has
a bypass must be constructed and installed so that oil will flow at the normal rate through the rest of the system with the strainer or filter completely blocked.
(2) The oil strainer or filter must
have the capacity (with respect to operating limitations established for the
engine) to ensure that engine oil system functioning is not impaired when
the oil is contaminated to a degree
(with respect to particle size and density) that is greater than that established for the engine under Part 33 of
this chapter.
(3) The oil strainer or filter, unless it
is installed at an oil tank outlet, must
incorporate a means to indicate contamination before it reaches the capacity established in accordance with
paragraph (a)(2) of this section.
(4) The bypass of a strainer or filter
must be constructed and installed so
that the release of collected contaminants is minimized by appropriate location of the bypass to ensure that collected contaminants are not in the bypass flow path.
(5) An oil strainer or filter that has
no bypass, except one that is installed
at an oil tank outlet, must have a
means to connect it to the warning
system required in Section 27.1305(r).
(b) Each oil strainer or filter in a
powerplant installation using reciprocating engines must be constructed and
installed so that oil will flow at the
normal rate through the rest of the
system with the strainer or filter element completely blocked.
[Amdt. 27-9, 39 FR 35462, Oct. 1, 1974, as
amended by Amdt. 27-20, 49 FR 6849, Feb. 23,
1984; Amdt. 27-23, 53 FR 34213, Sept. 2, 1988]

Section 27.1021

Oil system drains.

A drain (or drains) must be provided
to allow safe drainage of the oil system. Each drain must - 
(a) Be accessible; and

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