MIL-R-17852C(AS
3.5 Design and construction.
3.5.1 Type I. The reducer shall be of the type suitable in
all
respects for use in aircraft oxygen systems and shall operate
at supply
pressures of 250 to 1800 psig. The outlet pressure shall be a
predetermined
fixed pressure within the range of 80 ± 10 psig for flow rates
from zero
to 140 1pm {NTP).
3.5.1.1 Mounting. The reducer shall be designed for permanent mounting
on the airplane console. The location of the mounting holes shall have
sufficient clearance between the mounting and inlet and outlet ports to
allow for easy connection of fittings.
3.5.1.2 Shut-off valve. The reducer shall be provided with a shut-
off valve which shall be capable of allowing the flow to be turned on or
off. The shut-off valve shall be provided with a handle so that the
valve may be actuated with one hand.
3.5.1.3 Ports. The reducer shall be provided with l/8-inch internal
pipe threads in the inlet, relief, and outlet ports. Ports shall be
clearly visible and functions permanently marked.
3.5.2 Type II, The reducer shall be capable of reducing emergency
oxygen between the pressures of 250 and 1800 psig to a predetermined
fixed pressure within the range Of 45 to 80 psig for flow rates from
zero to 140 1pm (NTP).
3.5.2.1 Emergency supply release assembly shut-off valve. The emergency
reducer shall be provided with a manual and automatic emergency supply
release assembly. The valve shall be designed so that it may be actuated
with one hand. The assembly shall consist of a common pin or disc
attached to two pull cable assemblies. One pull cable assembly, for
manual release, shall be attached to a ball handle; the other pull
cable, for automatic release, shall be attached to the aircraft structure.
The pin or disc shall be provided with a device to prevent accidental
actuation of the bailout supply. The emergency supply release assembly
when engaged shall prevent operation of the reducer.
3.5.2.2 Ports. The reducer shall be provided with l/8-inch internal
pipe-threads in the relief and outlet ports. The inlet external threads
shall be as specified by the acquiring activity (see 6.2). Ports shall
be clearly visible and functions, permanently marked.
3.5.3 Types I and II. The reducer shall not induce or sustain hum or
vibration within its operating range of pressure or flow, nor shall it
sustain hum induced by aircraft vibration.
3.5.3.1 Filter. A triple filter consisting of 200 mesh wire screen
or equivalent shall be firmly secured in the high pressure oxygen inlet
of the reducer. This unit shall be easily removable for cleaning and
replacement.
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