Code of Federal Regulations - Title 14

789

Federal Aviation Administration, DOT

§ 29.1027

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 § 29.1305(a)(18).

(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. 29–10, 39 FR 35463, Oct. 1, 1974, as
amended by Amdt. 29–22, 49 FR 6850, Feb. 23,
1984; Amdt. 29–26, 53 FR 34218, Sept. 2, 1988]

§ 29.1021

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
(b) Have manual or automatic means

for positive locking in the closed posi-
tion.

[Amdt. 29–22, 49 FR 6850, Feb. 23, 1984]

§ 29.1023

Oil radiators.

(a) Each oil radiator must be able to

withstand any vibration, inertia, and
oil pressure loads to which it would be
subjected in operation.

(b) Each oil radiator air duct must be

located, or equipped, so that, in case of
fire, and with the airflow as it would be
with and without the engine operating,
flames cannot directly strike the radi-
ator.

§ 29.1025

Oil valves.

(a) Each oil shutoff must meet the re-

quirements of § 29.1189.

(b) The closing of oil shutoffs may

not prevent autorotation.

stops or suitable index provisions in
the ‘‘on’’ and ‘‘off’’ positions and must
be supported so that no loads resulting
from its operation or from accelerated
flight conditions are transmitted to
the lines attached to the valve.

§ 29.1027

Transmission and gearboxes:

general.

(a) The oil system for components of

the rotor drive system that require
continuous lubrication must be suffi-
ciently independent of the lubrication
systems of the engine(s) to ensure—

(1) Operation with any engine inoper-

ative; and

(2) Safe autorotation.
(b) Pressure lubrication systems for

transmissions and gearboxes must
comply with the requirements of
§§ 29.1013, paragraphs (c), (d), and (f)
only, 29.1015, 29.1017, 29.1021, 29.1023, and
29.1337(d). In addition, the system must
have—

(1) An oil strainer or filter through

which all the lubricant flows, and
must—

(i) Be designed to remove from the

lubricant any contaminant which may
damage transmission and drive system
components or impede the flow of lu-
bricant to a hazardous degree; and

(ii) Be equipped with a bypass con-

structed and installed so that—

(A) The lubricant will flow at the

normal rate through the rest of the
system with the strainer or filter com-
pletely blocked; and

(B) 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 flowpath;

(iii) Be equipped with a means to in-

dicate collection of contaminants on
the filter or strainer at or before open-
ing of the bypass;

(2) For each lubricant tank or sump

outlet supplying lubrication to rotor
drive systems and rotor drive system
components, a screen to prevent en-
trance into the lubrication system of
any object that might obstruct the

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