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Low pressure and high humidity. |
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|  MIL-M-85831(AS)
4.8.5.6 Low pressure and hiqh humidity. The mask shall be tested as
specified in MIL-STD-81O, Method 500.2, Procedure II, Operation. The mask
shall be fitted to a dummy head and connected to a breathing simulator set at
a flow of 110 1 pm at a rate of 44 cycles per minute. The chamber temperature
shall be reduced to -14F at a rate not exceeding 5F per minute and the
condition maintained for a period of 30 minutes. The pressure in the chamber
shall then be reduced to .7 standard atmospheres over a period of 15 minutes
and maintained at this pressure for 30 minutes. The chamber humidity shall
then be raised and maintained at, or close to saturation. The chamber
temperature shall then be raised to 32F and the pressure Increased to NTP
pressure at an approximately linear rate over a period of 15 minutes. The
chamber temperature shall then be raised at an approximately llnear rate to
86F with the humidity maintained at or near saturation, over a period of 30
minutes. The chamber conditions shall be maintained for a period of not less
than one hour and until all frost has melted. The mask shall meet the
requirements specified in 3.8.18 and 3.8.18.6.
4.8.5.7 Dust. The mask shall be subjected to the dust test as specified
in MIL-STD-81O, Method 510.2, Procedure I, Blowing Dust, for a period of six
hours at 73F and 300 ft./rein. air velocity and six hours at 131F and 1750
The relative humidity shall be not greater than 30 percent. The
ft./rein.
mask shall be fitted to a dummy head and connected to a breathing simulator
set at a flow of 110 lpm at a rate of 44 cycles per minute. With the
breathing simulator `ON', the mask shall meet the requirements specified In
3.8. 18 and 3.8.18.7.
4.8.5.8 Normal acceleration. The mask shall be subjected to the test as
specified in MIL-STD-810, Method 513.3, Procedure II, Operation, The mask
shall be fitted to a dummy head and connected to a breathing simulator set at
a flow of 110 lpm at a rate of 44 cycles per minute. With the breathing
simulator `ON', the mask shall be subjected to six g's in each of the six
directions. The mask shall meet the requirements specified in 3.8.18 and
3.8.18.8.
4.8.5,9 High temperature, diurnal cycle and high humidity. The mask shall
be subjected to the high temperature test as specified in MIL-STD-81O, Method
507.2, Procedure II, Cycle 4, normal test duration. The mask shall be
examined and tested every five days. The mask shall meet the requirements
.
specified in 3.8.18 and 3.8.18.9.
4.8.5.10 Shock. The mask shall be tested as specified in MIL-STD-81O,
Method 516.3, Procedure IV, Transit Drop. The mask shall be tested both in
its carrying case and out of its carrying case. The mask properly secured in
its carrying case shall be dropped on each face, edge and corners for a total
of 26 drops from a height of 48 inches from its center of gravity to the
impact surface. Another mask out of its case shall be dropped on each front
and back a total of 26 times from a height of 48 inches from its center of
gravity to the impact surface. The mask shall meet the requirements of 3.8.18
and 3.8.18.10.
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