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|  MIL-D-19326H
pet-square foot of surface area. MIL-STD-1359 can be used as a guide for system
cleaning.
* 3.9.1 Filter. A replaceable filter shall be provided in the oxygen system
where it will effective in minimizing the accumulation of contaminants in
critical components. The filter shall permit bypass of the element should the
flow through the element drop below safe levels. Type, size, and location of the
filter shall be determined by the manufacture.
3.9.2 Closures. If the location of the converter within the aircraft is such
that lines are required to be disconnected during aircraft maintenance checks or
overhaul, suitable closures shall be provided for each exposed connection to
prevent materials which are incompatible with oxygen from entering the system.
Caps which introduce moisture and tapes that leave adhesive deposits shall not be
used for thesse purposes. The closures shall remain with the aircraft at all times
and shall be stored, when not in use, in close proximity to the connections and in
such a manner as not to become contaminated. All openings of lines, fittings,
valves, and regulators shall be kept securely capped until closed within the
installation.
* 3.9.3 Decreasing. The oxygen distribution system or parts of the oxygen
system not covered by cleaning procedures shall be degreased in accordance with
MIL-STD-1359. After cleanliness verification and when assembled, a halide testing
apparatus having a sensitivity of at least 3 x 10
standard cc/see shall be used
to determine the absence of the cleaning compound.
* 3.9.4 Purging. The oxygen system shall be capable of being purged to remove
any contaminants. The purging procedure shall be as specified in MIL-STD-1359
with a final purge using oxygen conforming to MIL-O-27210, Type 1.
3.9.4.1 Converter. Table XII is applicable only when the converter is purged
through the vent outlet. Quick change style converters shall be removed from the
aircraft and purged away from the flight line.
3.9.4.2 Oxygen distribution system. Purge the aircraft oxygen distribution
system separate from the liquid oxygen converter, by establishing a flow from each
oxygen station of at least 5 litres per minute (83.5 cu.cm/s) for a period of not
less than 30 minutes. In large aircraft, it may be necessary to divide the
system, as determined by feeder lines, and purge each separately.
* 3.9.5 Lubricants. Lubricants in accordance with MIL-G-27617 may be used
sparingly on seals. When approved lubricants are used sparingly on seals and
straight threads when assembly difficulty is encountered, the specified torque
limits may no longer apply. Threads may strip at the recommended torque limits.
3.10 Maintenance and replacement. All parts of the oxygen system shall be
installed to permit ready removal and replacement without the use of special
tools. All tubing connections, fittings, regulators, converters and other items
shall be readily accessible for leak testing with leak test compound and for
tightening of fittings without removal of surrounding parts. Flexible hoses shall
be used to connect indicating instruments mounted on shock mounted panels to
permit easy maintenance.
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