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|  MIL-M-85831( AS)
3.4.6 Toxic materials. The use of materials which produce toxic effects
under any conditions shall be avoided.
The use of materials which will support
3.4.7 Flammable materials.
combustion shall be avoided.
3.5 Design and construction. The mask shall be used with and form part of
the protective assembly (PASS), as shown on Figure 1. The mask shall meet the
requirements as specified in MIL-P-85833 and this specification. The design
and construction of the mask shall be as shown on Figures 2 and 3. The mask
and all its accessories and components shall fit the 3rd to 98th percentile
male aircrewman as specified in MIL-P-85833. The design and construction
shall permit decontamination, using procedures of Army FM 3-5, without damage
to or deterioration of the mask or its protective capability.
3.5.1 Interfaces. The mask is intended for use in all USN/USMC
helicopters (H-1, H-2, H-3, H-46, H-53 and H-60 series) and shall be
compatible with crew station hardware and the electrical power systems aboard
the aircraft. It shall be compatible with all missions of these helicopters,
including use of optical, targeting and sighting devices, and shall be
compatible with and integrate with personal protective clothing and devices as
required by OPNAVINST 3710.7 and NAVAIR manual 13-1-6.7, and chemical,
biological, radiological (CBR) protective clothing in NAVAIR manual 13-1-6.10,
including sequential use of the SRU-36/P, Helicopter Emergency Escape Device
(HEED) . The mask shall also be compatible with laser protective equipment.
3.5.2 Storaqe life. The mask shall be designed to meet the performance
requirements of this specification after five years storage under worldwide
climatic conditions specified in MIL-STD-21O, when packaged as specified in
MIL-STD-794.
3.5.3 Interchanaeabi lity. All parts subassemblies and assemblies havinq
the-same part number shall be identical as specified in DOD-STD-480 and -
DOD-STD-100. When any unit or part is Interchanged, the mask shall meet all
performance requirements without adjustment or modification of any part or
subassembly.
3.5.4 Thermal protection. The mask shall provide protection against
thermal effects up to 10 cals./cm.z, to meet overall thermal load requirements
of the PASS system (see MIL-P-85833).
3.5.5 Intersystem leakage. The wearer shall be able to adjust the tension
of the or inasal mask on his face, both on the ground and in flight, to hold a
positive mask pressure without impairing the protection provided by the mask.
The leakage between the head and neck region and the respiratory compartment
of the mask shall be such that:
The inboard leakage into the respiratory compartment does not
a.
exceed 0.1 percent of the pulmonary ventilation when the mean
pressure inthe compartment is four in. water gage (WG.) greater
than that of the environment.
The outboard leakage is less than .02 cfm. when
b.
the mean pressure in the compartment is four in. MG.
greater than that of the environment.
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