MIL-DTL-62420B(AT)
4.10.8 Weathering test. This test shall be conducted upon completion of all the other
tests specified in 4.10 through 4.10.7. The periscope shall be subject to the environmental
conditions and the weathering tests specified below, the test cycle shall be approved by the
acquisitioning activity prior to test initiation. The periscope shall be subjected to and pass the
tests specified in accordance with 4.7.1.1 (modified), 4.7.1.2 (modified), 4.7.1.3 (modified),
optical density 4.7.1.5, and mirror and window lamination 4.10.1.3.
a. No less than 350 hours of simulated sunshine. Heat intensity shall be 160 +5°F
(71 +2°C) at the geometric center of the periscope. The spectral energy
distribution of simulated sunshine shall be in accordance with method 505.3 of
MIL-STD-810.
b. No less than 420 hours steady state hot-humid exposure at 110 +10°F
(43 +6°C) relative humidity 70 +10%.
c. No less than 420 hours of cold exposure at 20 +5°F (-7 +4°C).
d. Simulated sunshine shall include ultraviolet and be cycled in accordance with
Method 505.3, Procedure 1 of MIL-STD-810 except the diurnal cycle hot-dry
temperature shall have a peak temperature of 160 +5°F at the geometric center of
the periscope. Heat intensity shall be controlled by adjustment of the light source
to periscope distance and shall not be achieved by varying voltage to the source.
e. Environmental conditions a and b shall be cycled so that conditions shall not
exceed 10 hours duration, and condition c shall be maintained for minimum of
72 continuous hours.
f. No test exposure shall be followed by a like exposure. For the duration of the
test, the periscope shall be exposed to air, the test chamber, ozone and shall not
be purged with any inert gas.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified
in the contract or order (see 6.2). When actual packaging of materiel is to be performed by DoD
personnel, these personnel need to contact the responsible packaging activity to ascertain requisite
packaging requirements. Packaging requirements are maintained by the Inventory Control Point's
packaging activity within the Military Department or Defense Agency, or within the Military
Department's System Command. Packaging data retrieval is available from the managing Military
Department's or Defense Agency's automated packaging files, CD-ROM products, or by
contacting the responsible packaging activity.
6. NOTES
(This section contains information of a general or explanatory nature which may be
helpful, but is not mandatory.)
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