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|  MIL-M-85831 (AS)
4.8.2.7 Overall leakage. The mask shall be supported on a test fixture.
Blank the expiatory valve outlet and the neck seal opening. Close all valves
in the mask to preclude air passage. Inflate the mask with a pressure source
applied to the air hose Inlet until a reading of two Inches of water is
indicated by manometer. Allow the pressure In the hood to stabilize for a one
minute period. The mask shall meet the requirements of 3.8.7.
4.8.2.8 Valsalva device. The valsalva device shall be examined for full
and free operation. The valsalva device assembled to a mask mounted on a
dummy head shall be operated 1000 times and examined for any evidence of wear
or damage. The valsalva device shall meet the requirements specified in
3.8.8.
4.8.2.9 Restraint harness. The restraint harness assembly shall operate
freely when assembled to the facepiece. For the purpose of this test the
facepiece, with mask faceplece, may be attached to a representative head stand
complete with an aircrew helmet. An axial load of 10 pounds shall be applied
to the left hand side cable and an axial load of 15 pounds shall be applied to
the right hand side cable via the helmet attachment plates. The loads shall
be applied simultaneously for a period of 10 seconds in the direction of the
cable as normally worn. The test detailed shall be repeated with an axial
loading of 15 pounds applied to the left hand side cable. The harness
assembly shall meet the requirements specified in 3.8.9.
4,8,2.10 Anti-suffocation device. The anti-suffocation device shall be
examined for damage and the tube portion examined for freedom from
The anti-suffocation device shall meet the requirements
obstruction.
specified in 3.8.10.
4,8.2.11 Chemical aqent permeation. Materials used to manufacture the
mask shall be tested for chemical agent permeation. Test slabs made of the
same formulation, thickness, cure time and cure temperature as the facepiece,
lens, apron, hood and hoses may be used in lieu of mask materials.
4,8.2. 11.1 Mustard. Resistance to permeation by mustard shall be tested
as specified in MIL-STD-282, Method T-209. The material shall meet the
requi rements as specified in 3.8.11.
4 8.2. 11.2 Vx. Resistance to permeation by Vx shall be tested as
speci fied In MIL-STD-282, Method T-208. The material shall meet the
requi rements as specified in 3.8.11.
4.8.2. 11.3 Thickened soman. Resistance to permeation by thickened soman
shall be tested as specified in MIL-STD-282, Method T-208. The material shall
meet the requirements as specified in 3.8.11.
4.8.2.12 Optical. The lens area of the facepiece shall be tested as
specified in MIL-V-43511. The mask shall meet the requirements as specified
in 3.8.12.
4.8.2.13 Field of vision. Field of vision shall be tested with an Airmark
Projection Perimeter, or equal at the mask lens area in the "as worn"
The mask shall meet the requirements as specified in 3.8.13.
position.
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