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|  MIL-M-51113D(EA)
specification shall take precedence. Nothing in this specification, however,
shall supersede applicable laws and regulations unless a specific exemption has
been obtained.
REQUIREMENTS
3.
3.1 Materials and components. All materials and components shall conform to
Drawing 5-1-296 and the subsidiary drawings listed thereon.
3.2 Manufacture and assembly. The mask shall be manufactured and assembled
in accordance with Drawing 5-1-296,
3*3 Outlet valve leakage. Outlet valve leakage shall not exceed 15 milli-
liters of air per minute, at a pressure differential of 25 millimeters of
water, when tested as specified in 4.4.4.1.
3.4 Exhalation resistance. The exhalation resistance of the mask shall not
exceed 25 millimeters of water at an airflow rate of 85 liters per minute when
tested as specified in 4.4.4.2.
Lens optical defects.
3.5
3.5.1 Zone A. Zone A (see figure 1) of the lens shall not contain more than
an aggregate total of two bubbles, imbedded particles, or spots of 1/16 inch
diameter or less which are at least two inches apart. Zone A of the lens shall
not contain any imbedded particles or spots greater than 1/16 inch diameter,
any two imbedded particles or spots closer than two inches, any scratches,
abraded areas, creases, or other surface imperfections
3.5.2 Zone B. Zone B (see figure S) of the lens shall not contain more than
five bubbles of 1/16 inch diameter or less which are all at least one inch
apart. Zone B shall not contain any bubbles greater than 1/16 inch diameter or
any imbedded particles or spots closer than one inch. Zone B shall not contain
any creases or concave contoured areas (with permanent set) which distort
vision. Zone B shall not contain more than three scratches which are 1/4 inch
or shorter and 0.020 inch or narrower. Zone B shall contain no scratches which
are longer than 1/4 inch, wider than 0.020 inch, or closer than one inch from
any other scratch.
3.6 Microphone and plug assembly. The microphone and plug, after assembly
to the facepiece, shall. function properly when tested as specified in 4.4.4.3.
3.7 Mask assembly leakage. Overall leakage of the finished mask assembly
(excluding leakage of' the facepiece periphery, outlet valve seat, and through
-
the canister), shall not exceed 0.003 percent penetration when tested as speci-
fied in 4.4.4.4.
3.8 Preproduction. Prior to the start of regular production, a preproduc-
tion sample of masks shall be produced, in accordance with this specification~
for examination and tests (see 4.3).
3
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