4.6.13 Operability - torque. The torque required to rotate the input
coupling, boresight knobs~ opter knob, and focusing knob shall be measured
with standard measuring equipment affixed tothecoupling end knobs. The
measured torque shall be within the values specified in 3.13.2 at the tempera-
tures indicated. The boresight slip scales and filter lever shall be
subjected to a tactile examination and shall conform to the requirements
specified in 3.12.2 at the temperature indicated.
4.6.14 Sealing - assembled periscope. Assemble the periscope as speci-
fied in 3.13a. The internal pressurizing of the assembled periscope to test
sealing shall be performed with special testing equipment conforming to
22.214.171.124.4. Secure the poppet in Valve 10516717 in a closed position. Then
pressurize the periscope with clean dry air, to the value specified in 3.13a,
in accordance with the procedure for internal pressure testing on Sheet 1 of
Drawing F8565556. Retain the applied pressure in the periscope for a minimum
of 45 minutes. Within the first 30 minutes of this 45 minute time period, the
boresight knobs, diopter knob, focus knob, and input coupling shall be rotated
through a minimim of 3 full excursions of their rotational range. At the end
of the 45 minute period there shall be no evidence of leakage, as indicated on
the pressure gauge of the testing equipment, to determine compliance with
3.13a. Upon canpletion of test release the poppet in the Valve 10516717.
4.6.15 Sealing - head and body assemblies with shipping cover installed.
Performing this test in sequence to the test in 126.96.36.199, utilizing special
testing equipment conforming to 188.8.131.52.5. Install the shipping cover on the
head assembly and secure the poppet in Valve 10516717 in a closed position.
Pressure shall be applied to the head assembly through the valve provided in
the shipping cover. Install the shipping cover on the body assembly. Pres-
surize the head and body assemblies with dry nitrogen gas to the value speci-
fied in 3.13b, in accordance with the procedure for internal pressure testing
on Sheet 1 of Drawing F8565556. The dry nitrogen gas shall have a dew point
at least as low as minus 25°F. Retain the applied pressure in the head and
body assemblies for a minimum of 45 minutes. At the end of the 45 minute time
period there shall be no evidence of leakage as indicated on the pressure
gauge of the testing equipment. Upon completion of this test release the pop-
pet in Valve 10516717.
4.6.16 Flushing. The special testing equipment specified in 4.6.15 shall
be utilized in this test. A dew point tester, with appropriate adapters,
shall be used to test the dew point of the Interior atmosphere of the head
assembly and body assembly. Upon successful completion of the sealing test of
the periscope, the head assembly and body assembly shall be removed from its
mount. Install the shipping covers on the head assembly and body assembly.
The head assembly and body assembly shall then be flushed with dry nitrogen
gas. The flushing shall continue until the nitrogen gas bled from the head
assembly and body assembly has a dew point at least as low as minus 25°F as
measured with the dew point tester. The head assembly and body assembly shal
then be sealed. The internal pressure of dry nitrogen gas in the head assemb