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Manual shut-off and line valve indication |
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|  MIL-D-19326H
distribution. Converters shall be divided between each distribution or supply
line such that any one converter will provide oxygen supply to all outlets with
the exception of separate crew and passenger oxygen supply, then the crew may have
the passenger oxygen supply available but the passengers may not have the crew
oxygen supply. On aircraft such as transports where it is desired to provide
maximum survivability of the oxygen system, the converters shall be separated and
check valves provided such that the loss of one converter does not result in the
loss of the complete oxygen supply. Figure 7 shows an installation with two or
more liquid oxygen converters that are mounted side-by-side and manifolded to two
or more heat exchangers. Figure 8 shows an installation with two or more liquid
oxygen converters that when physically separated and provided with separate heat
exchangers and distribution plumbing as shown will maximize survivability. TO
enhance safety and maintenance, a manual shuut-off valve shall be provided on the
supply line near each converter such that either converter may be isolated as
necessary. If the shut-off valve is not accessible while inflight, it may be
desirable to also provide remote activation from the flight deck. Additionally,
line valve(s) shall be provided such that each entire distribution line may be
isolated from the oxygen outlets, for conditions of nonuse and safety. The line
valve(s) shall be readily operable from its/their location(s) while inflight and
each shall be clearly labeled near the valve(s) as to its/their proper use. Both
the manual shut-off and line valve shall withstand cryogenic liquid oxygen and
both shall be operable when subjected to liquid oxygen.
* 3.5.4.1 Manual shut-off and line valve indication. A means of indication
shall be provided on any manual shut-off and line valve provided such that it is
readily apparent to the flight crew whether the valve(s) is/are in "open" or
"closed" position. Whenprovided, the valves shall be located and installed such
that the proper markings and labeling are given as to function and type of
control. Line valve(s) shall be easily accessible while inflight but not located
as to be easily subject to damage. Line valves shall be marked as emergency or
safety devices.
* 3.5.5 Single converter, dual regulator. When the performance of the aircraft
is such that a pressure suit iS required {see 3.3.1.6), the applicable survival
kit shall be used. Figure 4 shows an installation with one liquid oxygen
converter and the necessary oxygen control panel and regulators for single place
aircraft. Figure 5 shows an installation with one liquid oxygen converter and the
necessary oxygen control panels and regulators for multiple crew stations.
* 3.5.6 Oxygen system survivability. The oxygen equipment, tubing and fittings
shall be located as remotely as practicable from fuel, oil, hydraulic fluid, water
injection, storage battery systems, exhaust stacks and manifolds, electrical,
radio and insulating materials. Insofar as practicable, boxygen lines shall not be
grouped with line carrying flammable fluids. Were necessary, deflector plates
shall be used to keep flammable fluids away from oxygen lines, fittings and
equipment. Converters shall not be in line with the plane of rotation of a
turbine or propeller. Components of the oxygen system shall not be installed
where they will be subjected to temperatures in excess of that specified in the
individual component specifications, and no part of the system shall be installed
in an area which will be subjected to a temperature of 260 F (123.3C) or greater.
In order to minimize loss due to heat, liquid oxygen converters shall not be
located near equipment that dissipates a high quantity of heat. Liquid oxygen
converters and associated fill and build-up and vent lines shall not be located
near aircraft components that give off flammable fluids or gases unless physically
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