Federal Aviation Administration, DOT
(b) Have manual or automatic means
for positive locking in the closed position.

(e) Splash-type lubrication systems
for rotor drive system gearboxes must
comply with SectionSection 27.1021 and 27.1337(d).

[Amdt. 27-20, 49 FR 6849, Feb. 23, 1984]

[Amdt. 27-23, 53 FR 34213, Sept. 2, 1988, as
amended by Amdt. 27-37, 64 FR 45095, Aug. 18,
1999]

Section 27.1027 Transmissions
boxes: General.

spaschal on DSK3GDR082PROD with CFR

Section 27.1043

and

gear-

COOLING

(a) The lubrication system for components of the rotor drive system that
require continuous lubrication must be
sufficiently independent of the lubrication systems of the engine(s) to ensure
lubrication during autorotation.
(b) Pressure lubrication systems for
transmissions and gearboxes must
comply with the engine oil system requirements of SectionSection 27.1013 (except paragraph (c)), 27.1015, 27.1017, 27.1021, and
27.1337(d).
(c) Each pressure lubrication system
must have an oil strainer or filter
through which all of the lubricant
flows and must - 
(1) Be designed to remove from the
lubricant any contaminant which may
damage transmission and drive system
components or impede the flow of lubricant to a hazardous degree;
(2) Be equipped with a means to indicate collection of contaminants on the
filter or strainer at or before opening
of the bypass required by paragraph
(c)(3) of this section; and
(3) Be equipped with a bypass constructed and installed so that - 
(i) The lubricant will flow at the normal rate through the rest of the system with the strainer or filter completely blocked; and
(ii) The release of collected contaminants is minimized by appropriate location of the bypass to ensure that collected contaminants are not in the bypass flowpath.
(d) For each lubricant tank or sump
outlet supplying lubrication to rotor
drive systems and rotor drive system
components, a screen must be provided
to prevent entrance into the lubrication system of any object that might
obstruct the flow of lubricant from the
outlet to the filter required by paragraph (c) of this section. The requirements of paragraph (c) do not apply to
screens installed at lubricant tank or
sump outlets.

Section 27.1041 General.
(a) Each powerplant cooling system
must be able to maintain the temperatures of powerplant components within
the limits established for these components under critical surface (ground or
water) and flight operating conditions
for which certification is required and
after normal shutdown. Powerplant
components to be considered include
but may not be limited to engines,
rotor drive system components, auxiliary power units, and the cooling or lubricating fluids used with these components.
(b) Compliance with paragraph (a) of
this section must be shown in tests
conducted under the conditions prescribed in that paragraph.
[Doc. No. 5074, 29 FR 15695, Nov. 24, 1964, as
amended by Amdt. 27-23, 53 FR 34213, Sept. 2,
1988]

Section 27.1043 Cooling tests.
(a) General. For the tests prescribed
in Section 27.1041(b), the following apply:
(1) If the tests are conducted under
conditions deviating from the maximum ambient atmospheric temperature specified in paragraph (b) of this
section, the recorded powerplant temperatures must be corrected under
paragraphs (c) and (d) of this section
unless a more rational correction
method is applicable.
(2) No corrected temperature determined under paragraph (a)(1) of this
section may exceed established limits.
(3) For reciprocating engines, the fuel
used during the cooling tests must be
of the minimum grade approved for the
engines, and the mixture settings must
be those normally used in the flight
stages for which the cooling tests are
conducted.
(4) The test procedures must be as
prescribed in Section 27.1045.
(b) Maximum ambient atmospheric temperature. A maximum ambient atmospheric temperature corresponding to

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