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|  MIL-M-85831 (AS)
3.9.9 Antlfogginq device, The mask shall have a device to deflect blown
filtered alr across the lens area to eliminate lens fogging and ensure a clear
visual area.
3.9.10 Microphone. The mask shall have a microphone that is compatible
with all aircraft radio and intercommunications devices. Cable terminals
shall provide direct electrical interface compatible with communication plugs
of USN/USMC aircrewmembers operating the aircraft series of 3.5.1 herein.
Intercommunication shall be possible both on the ground and fn flight.
3.9.11 Mainfold and hose assembly. The mask shall have a manifold to
distribute the airflow into the hood and respiratory areas of the mask. Hoses
shall be flexible material Impermeable to CBR agents and fitted with a
restraint cord to prevent overextension.
3.9.12 Valsalva device. The valsalva device shall provide for clearing
the ears by occlusion of the nostrils during changes of environmental pressure
in the external ear canal. Pressure shall also be balanced with that in the
visor cavity at all times. The device shall be operated with one CBR gloved
hand and shall not degrade CBR protection when operated.
3.9.13 Spectacle frames. The mask shall be compatible with standard
spectacles or specially designed spectacle frames to provide a means to fit
the aircrewman with corrective lenses.
3.9.14 Transit case. The transit case shall provide a means to protect
the mask and Its components and accessories and the intercom during transit or
storage .
3.10 Dimensions.
The envelope dimensions of the mask shall be as shown on
Figure 2.
3.11 Color. The mask shall be colored black, approximately matching color
number 37038 as specified in FED-STD-S95.
3.12 Nameplates and identification markings. Nameplate approval,
equipment identification marking and serial number assignment shall be as
specified in MIL-N-18307.
3.13 Configuration. The mask furnished in accordance with this
specification shall be developed and produced under a program for managing
system configuration as specified in DOD-STD-480, MIL-STD-483 and MIL-STD-490.
3.14 Human engineering. Human performance and human engineering design
criteria for the mask shall be as specified In MIL-STD-1472.
3.15 Workmanship. The mask shall be manufactured in a manner that results
in a product of uniform excellent quality free from defects which could effect
safety, protection, function, reliability or durability. The mask shall be
free of contamination and Imperfections such as dirt, grease, oil foreign
matter, malfunctioning of hardware and damage such as cracks, burrs, sharp
edges of metal parts and tears, punctures, permanent set of rubber parts,
distortion of metal parts or scratches in the lens area.
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