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|  MIL-B-48447A(MU)
4.6.1 Storage temperature. - This test shall be performed on body
assemblies procured as a repair part item. When the body assembly is
provided with a complete periscope this temperature test will not be re-
quired when the complete periscope is subjected to temperature cycling.
The testing equipment utilized in this test shall be in accordance with the
"Test Facilities" requirements of MIL-F-13926 and the conditions of 3.4.1.
The body assembly shall be placed in the test chamber and the temperature
of the chamber reduced gradually (see Note below) to -80F. The body
assembly shall remain at this temperature for a minimum of 5 hours. At the
completion of this 5 hour period, the temperature of the test chamber shall
0
be gradually raised (see Note below) to +160 F. The body assembly shall
remain at this temperature for a minimum of 5 hours. At the completion of
this 5 hour period, the temperature of the test chamber shall be gradually
0
reduced to room ambient temperature (+60 to +90F)., and the body assembly
removed from the test chamber. The body assembly shall then be subjected
to the visual tactile and audible examination of 4.6.4. The body assembly
shall conform to the requirements of 3.4.1.
NOTE:
The rate of temperature change in the test chamber shall not
exceed 20 degrees per hour. throughout the temperature cycling
tests of 4.6.1 and 4.6.2.
4.6.2 Operating temperatures. - This test shall be performed on body
assemblies procured as a repair part item, When the body assembly is pro-
vided with a complete periscope this temperature test will not be required
when the complete periscope is subjected to temperature cycling. The
testing equipment utilized in this test shall be in accordance with the
"Test Facilities" requirements of MIL-F-13926 and the conditions of 3.4.2.
The body assembly shall be placed in the test chamber and the temperature
of the chamber reduced gradually (see Note in 4.6.1) to -40F. The body
assembly shall remain at this temperature for a minimum of 5 hours. At
0
the completion of this 5 hour period, and while at -40 F, the body assembly
shall be subjected to the tests in 4.7.9 to-determine compliance with the
applicable requirements of 3.17, for this temperature (-40F). Upon
completion of this test, the temperature of the test chamber shall be gradu-
0
ally raised (see Note in 4.6.1) to +150 F. The body assembly shall remain
at this temperature for a period of 5 hours. At the completion of this
0
5 hour period and while at +150 F, the body assembly shall again be sub-
jected to the test in 4.7.9 to determine compliance with the applicable
0
requirements of 3.17, for this temperature (+I5O F). Upon completion of
this test, the temperature of the test chamber shall 0be gradually reduced
(see Note in 4.6.1) to room ambient temperature (+60 to +90F) and the
body assembly removed from the test chamber. Body assemblies which have
passed the above tests shall be subjected to the test in 4.6.3.
4.6.3 Collimation, pre-vibration/pre-shock setting.- Prior to
vibration/shock, the body assembly shall be positioned as in 4.6.7 to insure
conformance to 3.7. While viewing through the body assembly eyepiece,
obtain coincidence of the projected infinity target and the image of the
1200 meter target.
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