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|  MIL-M-19417D
4.6 Test conditions.
4.6.1 Gas. Unless otherwise specified, the gas used in testing the
masks shall be oxygen conforming to MIL-0-27210, type I.
4.6.2 Temperature and pressure. Unless otherwise specified,
inspections shall be conducted at local ambient temperatures and barometric
pressure. The temperature and barometric pressure shall be recorded at the time
of Inspection. This information shall be available for computation of test
data, where required, to normal temperature and pressure (NTP) conditions. NTP
o
conditions are 70 F and 29.92 inches of mercury. Test instruments shall be
calibrated or adjusted according to their required usage in conducting
individual tests.
4.7 Inspection methods.
4.7.1 Visual examination.
4.7.1.1 Mask assemblies. Every mask assembly shall be examined
visually (for critical defects) to determine conformance to this specification
and applicable drawings. The classification of defects, table VI, shall be used
to classify the defects found.
4.7.1.2 Dimensions. The mask assembly shall be checked dimensionally
to determine conformance to applicable standards.
4.7.1.3 Packaging. Each of the fully prepared shipping containers
containing mask assemblies selected as a sample unit from the lot shall be
examined to determine that the packaging, packing, and marking conform to this
specification. The classification of defects table VII, shall be used to
classify the defects found.
4.7.2 Odor. The mask shall be worn by six subjects in a manner that
will prevent exterior odors from influencing the test. The mask shall pass the
requirements specified in 3.6.2.
4.7.3. Mask leakage. The mask assembly shall be fitted to a suitable
facsimile of a head simulating service conditions and adjusted so there is no
leakage around the face seal. The free end of the hose shall be plugged. With
an internal suction of 13 millimeters of mercury applied at standard atmospheric
conditions, the mask shall conform to the requirements of 3.6.3.
4.7.4 Inhalation valve.
4.7.4.1 Low suction inlet performance. The inlet valve shall be
completely dry throughout this test. The inlet valve shall be inspected for
imperfect seating of the flapper on the seat. The valve shall be inspected for
leaks around the valve seat by applying and maintaining a suction of 0.19
millimeters of mercury at the free end of the inlet hose. The inlet valve shall
conform to the requirements of 3.6.4.1.
4.7.4.2 High suction inlet performance. This test shall conform to
4.7.4.1 except that a suction of 22.4 millimeters of mercury shall be used. The
inlet valve shall conform to the requirements of 3.6.4.2.
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