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|  MIL-D-19326H
4.5.4.2 Non-panel mounted regulator. Connect an oxygen mask assembly
incorporating a pressure breathing regulator and regulator-to-aircraft hose to the
oxygen system. Move the oxygen supply valve to the "ON" position. Breathe deeply
through the mask several times. The oxygen system shall pass the requirements
specified in 3.7.3.2.
4.5.5 Evaporation loss test. The completed aircraft system shall be filled
with liquid oxygen, and the mating assembly shall be disconnected from the
combination fill-buildup-vent valve. One hour after filling the system, a wax
pencil shall be used to mark positions of pointers on glass faces of liquid oxygen
quantity-indicators.
Twenty-four hours after marking indicators, readings shall
be taken on indicators and the evaporation loss shall be within the range
specified in 3.7.4.
4.5.6 Electrical continuity test. The liquid oxygen quantity indicator leads
shall be disconnected from the converter. A precision variable capacitor, capable
of providing stable and precise electrical capacitance equivalents of empty and
full liquid oxygen converters, shall be connected to the leads disconnected from
the converter. With the capacitor set to provide zero quantity indication, power
shall be applied to the indicator, and the capacitance input shall be recorded.
The capacitor shall then be set to provide full scale quantity indication, and the
capacitance input shall be recorded. The capacitance inputs shall be within the
limits specified in 3.7.5. Where two or more converters are installed in an
aircraft, the above test shall be conducted at each converter with the capacitor
connected to the leads disconnected from one converter, as described above, and
all other oxygen quantity indicator leads in the system disconnected from the
converters and connected to the dummy converters specified in 3.6.1.4.
4.5.6.1 Low-level warning. The test of the press-to-test button and low-level
warning light shall be conducted as specified in 4.5.6, except the variable
capacitor shall be set so that the indicator pointer indicates a quantity between
1/2 full and full. The press-to-test button shall then be actuated and the low-
level light shall pass the requirements specified in 3.7.5.1.
4.5.7 Flight test. When specified (see 6.2h), flight tests shall be conducted
-
and the oxygen system shall pass the requirements specified in 3.7.6. Upon
completion of the flight test, the oxygen system shall then be subjected to and
pass the tests specified in 4.5.2 and 4.5.4.
5.
PACKAGING
5.1 Not applicable.
6.
NOTES
(This section contains information of a general or explanatory nature that may
be helpful, but is not mandatory.)
6.1 Intended use. The design and installation requirements specified herein
are intended for use in designing and installing liquid oxygen systems in aircraft
using liquid to gaseous oxygen converters.
Acquisition documents should specify the
* 6.2 Acquisition requirements.
following:
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