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14 CFR Ch. I (1–1–14 Edition)
§ 23.1019
(5) The breather outlet is protected
against blockage by ice or foreign mat-
ter.
[Doc. No. 4080, 29 FR 17955, Dec. 18, 1964, as
amended by Amdt. 23–7, 34 FR 13094, Aug. 13,
1969; Amdt. 23–14, 38 FR 31823, Nov. 19, 1973]
§ 23.1019
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 for its type cer-
tification.
(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 § 23.1305(c)(9).
(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. 23–15, 39 FR 35460, Oct. 1, 1974, as
amended by Amdt. 23–29, 49 FR 6847, Feb. 23,
1984; Amdt. 23–43, 58 FR 18973, Apr. 9, 1993]
§ 23.1021
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;
(b) Have drain valves, or other clo-
sures, employing manual or automatic
shut-off means for positive locking in
the closed position; and
(c) Be located or protected to prevent
inadvertent operation.
[Amdt. 23–29, 49 FR 6847, Feb. 23, 1984, as
amended by Amdt. 23–43, 58 FR 18973, Apr. 9,
1993]
§ 23.1023
Oil radiators.
Each oil radiator and its supporting
structures must be able to withstand
the vibration, inertia, and oil pressure
loads to which it would be subjected in
operation.
§ 23.1027
Propeller feathering system.
(a) If the propeller feathering system
uses engine oil and that oil supply can
become depleted due to failure of any
part of the oil system, a means must be
incorporated to reserve enough oil to
operate the feathering system.
(b) The amount of reserved oil must
be enough to accomplish feathering
and must be available only to the
feathering pump.
(c) The ability of the system to ac-
complish feathering with the reserved
oil must be shown.
(d) Provision must be made to pre-
vent sludge or other foreign matter
from affecting the safe operation of the
propeller feathering system.
[Doc. No. 4080, 29 FR 17955, Dec. 18, 1964, as
amended by Amdt. 23–14, 38 FR 31823, Nov. 19,
1973; Amdt. 23–43, 58 FR 18973, Apr. 9, 1993]
C
OOLING
§ 23.1041
General.
The powerplant and auxiliary power
unit cooling provisions must maintain
the temperatures of powerplant compo-
nents and engine fluids, and auxiliary
power unit components and fluids with-
in the limits established for those com-
ponents and fluids under the most ad-
verse ground, water, and flight oper-
ations to the maximum altitude and
maximum ambient atmospheric tem-
perature conditions for which approval
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