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Page Title:
Insertion and removal (telescope and tracker). |
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|  MIL-M-63330 (AR)
The internal pressurizing of the mount to test
4.6.5 Sealing
sealing shall be performed with special testing equipment conforming
to 4.5.2.3.1. Secure the poppet in valve 10516717 in a closed
position. The pressure shall be applied through the valve in the
mount. Pressurize the mount with dry nitrogen gas 5.0 + 0.10 psig
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 25F. The applied pressure shall
be retained for a minimum of 2 hours. Within the first 60 minutes
of this 2 hour time period, the ERROR lever shall be rotated through
a minimum of 3 full excursions (CCW stop to CW stop to CCW stop), of
its rotational range. Any evidence of leakage in the mount, at the
end of the 2 hour time period, shall not exceed the tolerance
specified in 3.5, as measured on the pressure gauges of the testing
equipment. Upon completion of this test, release the poppet in valve
10516717.
4.6.6 Interior atmosphere. Perform this test in sequence to
the test in 4.6.5 The special testing equipment specified in 4.6.5
shall be utilized in this test. A dew-point tester, with an
appropriate adapter to accommodate the Valve 10516717, shall be used
to test the dew-point of the interior atmosphere of the mount. The
mount shall be flushed with dry nitrogen gas. The flushing shall
continue until the nitrogen 0 gas bled from the mount has a dew point
at least as low as minus 25 F, as measured with the dew point
tester. The dew point tester shall be removed from the mount. The
internal pressure of nitrogen gas in the mount shall be brought to a
measured 3 psig + 0.5 psig. The internal pressure of the mount
shall be monitored for a period of 5 minutes + 15 seconds. At the
end of the 5 minute period there shall be no evidence of leakage in
the mount as indicated on the pressure gauge of the testing
equipment. The mount shall conform to the requirements of 3.21.
4.6.7 Insertion and removal (telescope and tracker). Position
the mount on holding fixture that secures its mounting surface in a
vertical plane within 5 degrees. Perform this test utilizing
Functional Gage, Drawing F1054I523, to simulate the telescope, and
Functional Gage, Drawing F10541525, to simulate the missile tracker.
Insert Gage 10541523 into the telescope cavity of the mount and lock
in place by means of the telescope locking mechanism of the mount,
then insert Gage 10541525 into the tracker cavity of the mount and
secure in place by means of its two mounting bolts. Remove the Gage
10541525 from the mount. During this insertion and removal of the
Gage 10541525 there shall be no interference or restriction caused
by the mounted Gage 10541523 or the checksight housing of the mount.
Continue this test by inserting and securing the Gage 10541525 in
the mount, then inserting and removing the Gage 10541523. The mount
shall conform to the requirements of 3.7.2.
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