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|  MIL-T-60826B(MU)
3 mutually perpendicular axes while the telescope is maintained in its
using position, as depicted in the lower view on sheets 1 and 2 of Drawing
F10553175. The telescope shall be horizontally mounted on the vibration
table by means of an adapter. This adapter shall immobilize the objective
tube assembly, and the offset tube assembly, so that the articulating joint
assembly is immobilized in its midpoint of the articulating range. The
telescope shall be vibrated in accordance with Procedure IX, Part 1 of
MIL-STD-810, except that the frequency, frequency cycling, and amplitude
of the vibration shall be as specified in 3.3.3. Upon completion of the
vibration cycling the telescope shall be subjected to the tests specified
in 4.6.3.1.
4.6.3.1 Examination. - Subsequent to vibration the telescope shall
be thoroughly examined for physical defects resulting from poor workman-
ship and materials to detemine conformance with 3.3.3, prior to being
subjected to the remaining tests specified herin. A visual examination
shall be made for missing or damaged parts. A tactile examination shall
also be conducted to determine looseness or improper functioning of
moving parts such as the articulated joint, diopter adjustment, bore-
sight knobs, power selector lever, etc. An audible examination shall
be made of the telescope by shaking it and listening for loose internal
parts or broken optical components, such as lenses, prisms, reticles, etc.
The electrical circuit shall be inspected for damage by energizing each
reticle light (see 4.6.7) and conducting a visual examination for mal-
function such as: no reticle illumination, flicker intermittent illumina-
tion, etc. Any one of the possible defects defined above shall be cause
to consider a telescope defective. Telescopes which have passed the
above examinations shall be subjected to the tests specified in 4.6.4
through 4.6.19 inclusive to determine overall compliance with 3.3.3.
4.6.4 Cleanliness. - The optical surfaces shall be inspected for
cleanliness in accordance with MIL-O-13830. the telescope shall conform
to the cleanliness requirements of 3.4. Dirt particles which interfere
with the legibility or accuracy of the reticle patterns shall be cause
for rejection.
4.6.5 Sealing. - The internal pressurizing of the telescope (tele-
scope assembly and reticle projector assembly) to test sealing, shall
be performed with special testing equipment conforming to 4.5.2.3.1.
Secure the poppet in valves 10516717, and 11727998 in a closed position.
Then pressurize the telescope assembly and reticle projector assembly
through the applicable valve with dry nitrogen gas to 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 in each assembly (tel-
escope and reticle projector) shall be retained for a minimum of 2 hours.
Within the first 60 minutes of this 2 hour time period, the telescope
eyepiece housing assembly shall be elevated through a minimum of 3 full
excursions of the articulated joint assembly, the power selector lever
shall be repositioned a minimum of 3 times, the diopter adjustment shall
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