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|  MIL-D-19326H
gaseous oxygen trailer, conforming to MIL-T-26069, shall be used.
Transfer
equipment shall mate with fittings provided for filling.
4.4.2 Leak test compound. The leak test compound employed in testing the
system shall conform to MIL-L-25567.
4.4.3 Temperature and pressure. Unless otherwise specified, tests shall be
conducted at local ambient temperature and barometric pressure. Test instruments
shall be calibrated or adjusted according to their required usage in conductin
individual tests. Temperature and pressure shall be recorded at the time of
inspection and shall be available, when required, for correction of test results
to normal temperature and pressure (NTP) conditions. NTP conditions are 29.92
inches of mercury (101.2 kPa) and 70F (21.1C).
4.5 Inspection methods.
4.5.1 Visual examination. The oxygen system shall be examined visually to
determine conformance to this specification and applicable drawings with respect
to all the requirements not covered by tests.
4.5.2 Leakage test. The complete oxygen system, excluding the converter,
personal mounted regulator, seat pan, mask and hard line relief valve, shall be
subjected to a gaseous oxygen pressure equal to its operating pressure. While
this test pressure is maintained, all fittings and connections shall be examined
for leaks by application of leak test compound conforming to MIL-L-25567. The
oxygen system shall pass the requirements specified in 3.7.1. Care shall be taken
to remove all traces of leak test compound from the system after this test is
performed.
4.5.3 Pressure decay. The complete system shall be charged with gaseous
oxygen to the system operating pressure. Removable converters may be removed for
this test. After system pressure has been stabilized for five (5) minutes, record
oxygen pressure, time and distribution line temperature. The oxygen pressure and
distribution line temperature shall again be recorded after one-half hour and
shall pass the requirements specified in 3.7.2.
4.5.4 Functional test. The following functional tests shall be performed for
each station of each aircraft, where applicable, after filling the system with
liquid oxygen, and permitting the system to buildup to the designed operating
pressure.
4.5.4.1 Panel mounted regulator.
4.5.4.1.1 Flow indicator. Connect a pressure breathing oxygen mask and
hose
assembly to the oxygen system. Move the diluter lever on the regulator to
the
"l00 - percent oxygen" position. Breathe oxygen normally through the mask
for a
period of one minute and observe the flow indicator of the regulator. The
oxygen
system shall pass the requirements specified in 3.7.3.1.1.
4.5.4.1.2 Emergency switch. Connect a pressure breathing oxygen mask and hose
assembly to the oxygen system. Move the diluter lever to the "normal" position.
Set the regulator emergency switch to the emergency position for a period of 10 to
20 seconds. The oxygen system shall pass the requirements specified in 3.7.3.1.2.
After the test, the emergency switch shall be returned to the normal position.
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