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|  MIL-R-25410G
4.8.19 Panel lighting. The plastic lighting plate portion of the
regulator shall be subjected to and pass all the tests specified in
MIL-P-7788. The regulator shall pass the requirements specified in 3.6.18.
4.8.20 Vibration. The regulator shall be vibrated for 3 hours, in each
of three mutually perpendicular planes, at a frequency from 300 to 3000 and
back to 300 cycles per minute, at a constant rate of change and a double
amplitude of 0.018 to 0.020 inches. The vibration test shall be conducted
with an inlet pressure applied to the regulator as indicated in 4.7.5. The
regulator shall pass the requirements specified in 3.6.19. The regulator
shall then be subjected to and pass the flow characteristics and pressure-
breathing characteristics tests.
4.8.21 Endurance. The regulators shall operate without failure during
and after 500,000 cycles. The peak delivery rate shall be 30 lpm nomal
temperature and pressure (NTP) flow for 90 percent of the time and 90 lpm
(NTP) for 10 percent of the time. The regulator shall pass the requirements
specified in 3.6.20. The regulator shall then be subjected to and pass the
flow characteristics and pressure-breathing characteristics tests.
4.8.22 Orientation. The regulator shall be subjected to the flow
characteristics, oxygen-ratio and pressure-breathing characteristics tests
while mounted with the panel of the regulator in a horizontal position, facing
downward, and with the panel of the regulator in a vertical position. The
regulators shall paSS the requirements specified. in 3.6.21.
4.8.23 Ozone-resistant [elastomer components). Three of the six
test slabs submitted for qualification inspection shall be tested for ozone-
resistance. The test apparatus shall be in accordance with ASTM D 1149-86.
The test slabs shall be elongated 20 percent, placed in an ozone-free
atmosphere for 24 hours, then placed in the ozone chamber. The chamber shall
be adjusted to 100 2 F and to give an exposure of ozone concentration
of 120 10 parts by volume of ozone per million parts by volume of air. The
air-ozone velocity in the chamber shall be at least 2 feet per second. The
material shall be exposed to these conditions for 60 minutes. The test slabs
shall be examined under a 10X magnification and pass the requirements
specified in 3.6.22.
4.8.24 External pressure. With the diluter lever placed in the
"Normal Oxygen" and "100% Oxygen" position, the regulator shall be connected to
a source of pressure to provide the applicable maximum inlet pressure. Under
these conditions, and with the oxygen supply valve placed in the "off"
position, the regulator shall be subjected to an external pressure of 11.0
psig for a period of one minute. The regulator shall pass the requirements
specified in 3.6.23. Upon completion of this test, the regulator shall then
be subjected to and pass the flow characteristics, oxygen-ratio and pressure-
breathing characteristics test.
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