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MIL-M-85831 (AS)
When tested as specified in 4.8.5.12 the mask
3.8.18.12 Solar radiation.
shall operate without failure.
3.8.18.13 Heiqht and center of gravity.  The weight of the mask with
manifold and hoses shall be not greater than three pounds.  The center of
gravity of the head mounted portion, when worn, shall be as near to the center
of gravity of the bare head as possible when measured as specified in 4.8.5.13.
3.9 Component parts.  The mask shall consist of the components specified
in 3.9.1. thru 3.9.12 and other parts as necessary which are essential to
form a complete, assembled and operating mask.
3.9.1 Head cowl assembly.  The head cowl assembly shall consist of an
apron, neck seal, and hood.  The hood and apron shall be made of an
impermeable rubber, cover the entire head and extend down the neck and over
the shoulder.  The neck seal shall also be made of Impermeable rubber and
shall isolate the head and neck from the rest of the body.
3.9.2 Facepiece.  The facepiece shall be sealed Into the front of the
hood .  The optical area shall be transparent and the lower part shall be
black.  Included in the facepiece shall be a valsalva device, restraint
harness,  inlet ports for filtered air, anti-suffocation device connector,
entry tube to facilitate drinking, and microphone assembly.
3.9.3 Or inasal mask.  The or inasal mask shall be molded of a soft rubber
to fit over the wearer's nose and mouth.  The or i nasal mask shall incorporate
a turned under edge to increase the mask's efficiency to seal around the
wearers face.  The or inasal mask shall be mounted within the faceplate.
3.9.4 Hood inlet adapter.  The hood inlet adapter shall connect the hose
from the manifold assembly to the hood compartment of the mask.
3.9.5 Valves.  The mask shall contain sufficient valves designed and
constructed to allow proper flow of air to the hood and respiratory areas to
meet the requirements of protection factor, breathing and ventilation
requirements of this specification and the PASS system specification.
To prevent suffocation as a result of loss
3.9.6 Anti-suffocation device.
of air supply or after ditching, the anti-suffocation device shall be capable
of manual operation with one CBR gloved hand.
3.9.7 Drinking device.  The drinking device for hot and cold liquids and
liquid medication shall consist of an entry tube which passes through the the
facepiece, terminating in the or inasal mask. The drinking device shall be
capable of coupling with the entry tube and a canteen with an MK-17 cap.  The
entry tube/drinking device shall be capable of operation in the temperature
range of +32F to +131F.
3.9.8 Restraint harness assembly.  The restraint harness assembly shall be
used to attach the mask to the helmet and prevent movement of the mask on the
face during aircraft maneuvers and to permit adjusting the tension of the mask
to the face.

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