MIL-DTL-62420B(AT)
3.7.6 Submergence. No water leakage shall occur through the equipment seal and
assembly as the equipment is retained on its mounting surface during test.
3.7.7 Fungus. The assembly shall not support fungal growth when exposed to inoculation
by spraying external surfaces with spore suspension.
3.7.8 Weathering. After meeting the performance and environmental requirements, the
periscope shall be capable of meeting the requirements of 3.4.1.5, 3.7.1.3, 3.7.8.1, 3.7.8.2, and
3.7.8.3, and shall be otherwise functional and undamaged subsequent to exposure.
3.7.8.1 Resolution (modified). The periscope shall meet the requirement of 3.4.1.1,
except that resolution shall be within 75 seconds of arc.
3.7.8.2 Spherical power (modified). The periscope shall meet the requirements of
3.4.1.2, except that spherical power shall be within the range of -0.60 to +0.30 diopter.
3.7.8.3 Astigmatism and light transmission (modified). The periscope shall meet the
requirements of 3.4.1.3 and 3.4.1.4, except that astigmatism and light transmission shall not be
degraded in excess of 20% of the value recorded prior to weathering tests.
4 VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are
classified as follows:
a. First article inspection (see 4.3).
b. Conformance inspection (CI) (see 4.4).
4.2 Inspection conditions. Unless otherwise specified (see 6.2), all inspections shall be
performed in accordance with the following conditions:
a. Temperature: 73 +18°F (23 +8°C)
b. Relative humidity: Uncontrolled room ambient.
c. Atmospheric pressure: Site pressure.
4.3 First article inspection. First article inspection shall be performed on six (6)
periscopes when a first article sample is required (see 3.1). First article sample shall be inspected
as specified in table III. Approval of the first article sample by the Government shall not relieve
the contractor of his obligation to supply periscopes that are fully representative of those
inspected as a first article sample. Any changes or deviations of the production units from the
first article sample shall be subject to the approval of the contracting officer (see 3.1).
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