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MIL-T-46324D(MU)
4.6.1.1 Condensation (low temperature). - Subsequent to low tempera-
ture and immediately upon stabilization at room temperature (60 to 90F),
the telescope shall be thoroughly examined as specified in 3.5.3.1. The
requirements of 3.5.3.1 shall be met. The telescope shall then be sub-
jetted to the test in 4.6.1.2.
4.6.1.2 Storage temperature (+160F). - The testing equipment utilized
in this test shall be in accordance with the "Test Facilities" requirements
of MIL-F-13926 and conditions of 3.5.1. The telescopt assembly shall be
exposed to +1600F temperature extreme specified in 3.5.1 for a period of 5
hours. At the end of the 5 hour period, the telescope shall be stabilized
to an ambient temperature between 60 to 90F and subjected to a visual
examination. The telescope shall conform to the requirements of 3.5.1;
Caution shall be exercised during this test to avoid subjecting the tele-
scope to thermal shock.
4.6.2 Vibration. - Standard vibrating equipment capable of providing
the amplitude and frequency as specified in 3.5.2 shall be utilized for
the vibration test. Unless otherwise specified, the test equipment shall
be in accordance with MIL-F-13926 The telescope shall be vibrated in the
direction and conditions specified in 3.5.2. Upon completion of the vibra-
tion test, the telescope shall be subjected to the visual examination
specified in 4.6.2.1.
4.6.2.1 Examinaiton. - Subsequent to vibration, the telescope shall be
thoroughly examined for physical defects prior to being subjected to the
remaining tests specified herein. A visual examination shall be conducted
externally and internally for missing or damaged parts, with particular
attention to lenses, prism and reticle. Any one of the possible defects
defined above shall be cause to consider the telescope defective. Tele-
scopes which have passed the above examinations shall be subjected to the
tests specified in 4.6.3 through 4.6.8 inclusive.
4.6.3 Sealing. - Internal pressurizing of the telescope to test sealing
shall be performed using dry nitrogen gas having a dew point at least as
low as -25F and special testing equipment conforming to 4.5.2.3.2. The
telescope shall be pressurized to the requirements of 3.5.3 in accordance
with the procedure for internal pressure testing of Drawing F8565556.
Maintain the applied pressure for the period specified to balance pressure
within the telescope cells. With the pressure at 5 0.1 psig, the tele-
scope shall retain this pressure for 2 hours with no indication of leakage
in excess of 0.2 psig as indicated on the pressure gage of the testing
equipment. Upon satisfactory completion of this test, the body sealing
screw shall be assembled tO the telescope as depicted on Drawing
F10548042 (Sheet 2) immediately, to minimize intermingling of external
atmosphere upon disconnection of the pressure tester adapter.
9

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