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|  MIL-M-19417D
3.6.2 Odor. When tested as specified in 4.7.2, the mask shall be
judged to have no objectionable odor by at least four of the SIX subjects.
3.6.3 Mask leakage. When tested as specified in 4.7.3, the Inboard
leakage shall not exceed 100 milliliters per minute.
3.6.4 Inhalation valve.
3.6.4.1 Low suction inlet performance. The total leakage through the
valve inlet portion shall be 15 milliliters per minute or less when tested in
accordance with 4.7.4.1.
3.6.4.2 High suction inlet performance. The total leakage through the
valve inlet portion shall be 150 milliliters per minute or less when tested in
accordance with 4.7.4.2
3.6.4.3 Inspiratory resistance. When tested as specified in 4.7.4.3,
the inspiratory resistance of the mask shall not be greater than 1.7 inches of
water.
3.6A Exhalation valve.
3.6.5.1 Exhalation performance. Apressure of 20 millimeters of
mercury in the face piece and between 15 and 19.9 millimeters of mercury in the
inlet hose shall cause the exhalation valve to open when tested in accordance
with 4.7.5.1.
3.6.5.2 Exhalation resistance. Exhalation resistance shall not be
greater than 4.67 millimeters of-mercury with a flow of 100 liters per minute
when tested in accordance with 4.7.5.2.
3.6.6 Subjective tests.
3.6.6.1 Visibility. When tested as specified in 4.7.6.1, the mask lens
shall possess the minimum visibility requirements specified below:
Direction
Visibility
o
Up 0
50"
up 30
54
0
64
Up 60
0
770
Side 90 0
Side 120
72
Side 150
59
0
Down 165
55
3.6.6.2 Facial fit. When tested as specified in 4.7.6.2, the mask
shall be suitable for all size heads without adjustment other than by means of
the head straps. The inside contour of the mask shall be smooth, free from
excessive pressure points and other features which might lead to personal
discomfort.
3.6.7 Low temperature. When tested as specified in 4.7.7, the mask
shall not exhibit any impairment of operation.
3.6.8 High temperature. When tested as specified in 4.7.8, the mask
shall not exhibit any impairment of operation.
7
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