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MIL-P-48450A(MU)
shall be gradually raised (see above rate of temperature change) to +160F.
The periscope shall remain at this temperature for a minimum of five hours.
At the completion of this five hour period, the temperature of the test
chamber shall be gradually reduced to room ambient temperature (+60 to
+90F), and the periscope removed from the test chamber.  The periscope shall
then be subjected to the visual and audible examination of 4.6.3.5.  Peris-
copes which have passed the above examination shall be subjected to the re-
maining tests, specified in 4.6.1.2 through 4.6.5.2, inclusive.  The peris-
copes shall conform to the requirements of 3.4.1.
NOTE:
Temperature testing of each head, daylight body and passive
elbow assembly is not required when the complete periscope
is subjected to temperature cycling (see 3.1). A record
of all data necessary to determine compliance with required
performance shall be available.
4.6.1.2 Operating temperatures.- The test equipment utilized in this
test shall be accordance with the "Test Facilities" requirements of
MIL-F-13926 and the conditions of 3.4.2.  The periscope shall be placed in
the test chamber and the temperature of the chamber reduced gradually
(rate of temperature change in the test chamber shall not exceed 20 degrees
per hour throughout the temperature cycling test) to -40F.  The periscope
shall remain at this temperature for a minimum of five hours.  At the
completion of this five hour period and while at -40F, the periscope
shall be subjected to the tests in 4.6.2 to determine compliance with the
applicable requirements of 3.6.10, for this temperature (-40F). Upon com-
pletion of this test, the temperature of the test chamber shall be gradually
raised (see above rate of temperature change) to +150F. The periscope
shall remain at this temperature for a period of five hours.  At the com-
pletion of the five hour period and while at +150F, the periscope shall
again be subjected to the tests in 4.6.2 to determine compliance with the
applicable requirements of 3.6.10, for "this temperature (+150F). Upon com-
pletion of this test, the temperature of the test chamber shall be gradually
reduced (see above rate of temperature change) to room ambient temperature
(+60 to +90F) and the periscope removed from the test chamber.
NOTE:
Temperature testing of each head, daylight body and passive
elbow assembly is not required when the complete periscope
is subjected to temperature cycling (see 3.1). A record of
all data necessary to determine compliance with required
performance shall be available.
4.6.2 Operability.
4.6.2.1 Elevation input coupling.- . Standard torque measuring equip-
ment capable of measuring the torque values specified in 3.6.10.1 shall
be utilized for this test.  An appropriate adapter to accommodate the coupl-
ing shall be used with the torque measuring equipment. The running torque re-
quired to rotate the elevation input coupling through its full range of
travel in each direction shall not exceed the value specified in 3.6.10.1
for the temperatures indicated.
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