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|  MIL-P-48451A(MU)
4.5.2.2 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 i's 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, construction,
materials, 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
4.5.2.3 Special inspection equipment.
4.5.2.3.1 Performance.- Special testing equipment to test performance
of the complete periscope- shall conform to the requirements of drawing
F11746743 (Final Acceptance-Inspection Test Equipment and Arrangement
Drawing) and all drawings pertaining thereto
4.6
Test
methods
and
procedures
NOTE:
Caution shall be exercised during the following tests to-prevent
Arm Assembly 8635116 and Arm 8619845 from striking hard against
their respective stop pins.
4.6.1 Environmental.
4.6.1.1 Storage temperature.- The test equipment utillized 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 exceede 20 de-
grees per hour throughout-the temperature cycling test) to -80 F. 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 O shall be gradually raised (see above rate of temperature change)
to +160 F. The periscope shall-remain at this temperature for a minimum
of five hours. At the completion of this five hour period, the tempera-
ture of the test chamber shall be gradually reduced to room ambient tem-
perature (+60 to +90F), and the periscope removed from the test chamber.
The periscope shall then be subjected to the visual and audible examination
of 4.6.3.3. Periscopes which have passed the above examinations shall be
subjected to the remaining tests specified in 4.6.1.2 through 4.6.7.2 in-
clusive. The periscope 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 avail-
able.
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