539
Federal Aviation Administration, DOT
§ 27.1021
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]
§ 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 atti-
tude;
(e) Adequate venting is provided; and
(f) There are means in the filler open-
ing to prevent oil overflow from enter-
ing 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]
§ 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.
[Amdt. 27–9, 39 FR 35462, Oct. 1, 1974]
§ 27.1017
Oil lines and fittings.
(a) Each oil line must be supported to
prevent excessive vibration.
(b) Each oil line connected to compo-
nents 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 di-
ameter of the engine inlet or outlet. No
line may have splices between connec-
tions.
§ 27.1019
Oil strainer or filter.
(a) Each turbine engine installation
must incorporate an oil strainer or fil-
ter through which all of the engine oil
flows and which meets the following re-
quirements:
(1) Each oil strainer or filter that has
a bypass must be constructed and in-
stalled so that oil will flow at the nor-
mal rate through the rest of the sys-
tem with the strainer or filter com-
pletely blocked.
(2) The oil strainer or filter must
have the capacity (with respect to op-
erating limitations established for the
engine) to ensure that engine oil sys-
tem functioning is not impaired when
the oil is contaminated to a degree
(with respect to particle size and den-
sity) that is greater than that estab-
lished 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 con-
tamination before it reaches the capac-
ity 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 contami-
nants is minimized by appropriate lo-
cation of the bypass to ensure that col-
lected contaminants are not in the by-
pass 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 § 27.1305(r).
(b) Each oil strainer or filter in a
powerplant installation using recipro-
cating 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 ele-
ment 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]
§ 27.1021
Oil system drains.
A drain (or drains) must be provided
to allow safe drainage of the oil sys-
tem. Each drain must—
(a) Be accessible; and
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