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4.5.2 Contractor furnished inspection equipment. Government design.- Unless otherwise specified in the con-
tract, all inspection equipment specified by drawing number in specifica-
tion or SQAP forming a part of the contract shall be supplied by the con-
tractor in accordance with technical data listed in the technical data
package (TDP). Contractor design,- The contractor shall design and supply
inspection equipment compatible with the ` Test Methods and Procedures"
specified in 4.6 of this specification and with the component inspection
procedures specified in "Examination" and "Test Facilities" requirements
of MIL-F-13926.  Since tolerance of test equipment is normally considered
to be within 10% of the product tolerance for which it is intended, this
inherent error in the test equipment design must be considered as part of
the prescribed product tolerance limit.  Thus, concept, constructiont ma-
terials, dimensions and tolerances used in the design of test equipment
will reliably Indicate acceptability of a product which does not exceed
90% of the prescribed tolerance limit, and permit positive rejection when
non-conforming.  Construction shall be such as to facilitate routine cali-
bration of test equipment. Special inspection equipment. Performance.-  Special testing equipment to test performance
of the complete periscope shall conform to the requirements of Drawing
F11738140 (Test Set-up, Periscope) add all drawings pertaining thereto.
4.6 Test methods and procedures.
At no time during the following tests shall the input coupling
be allowed to strike hard against the travel stops.
4.6.1 Environmental. Storage temperature.- The test 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 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 -80F. The periscope
shall remain at this temperature for a minimum of five hours.  At the com-
pletion of this five hour period, the temperature of the test chamber 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 chamb-
er 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 Periscopes
which have passed the above examination shall be subjected to the remaining
tests, specified in through, inclusive.  The periscopes
shall conform to the requirements of 3.4.1.

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