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|  MIL-T-48554A(AR)
3.6.2 Operating temperature. The telescope shall meet the
applicable requirements of 3.11.6 through 3.11.7.2 while exposed
and thermally stabilized 2 0hours + 15 minutes at an ambient
o
0
temperature of +150F (+65 C) + 5 F (3 C) and exposed and
thermally stabilized 4 hours + 15 minutes at an ambient
temperature of -50 (-46C) 5F (+3C). Upon return to
standard ambient temperature, +60F to +90F (+16C to +32C),
from each operating temperature, the mount shall meet the
requirements of 3.7 through 3.14.
3.6.3 Shock. The telescope shall withstand a total of 18
shock impuilses, 3 in each direction of 3 mutually perpendicular
axis. Each shock impulse shall be a half-sine wave with a time
duration of 6 1 milliseconds. The peak amplitude of each shock
impulse shall be 75g's. Subsequent to shock, the telescope shall
show no evidence of physical damage and shall meet the
requirements of 3.7 through 3.14.
3.6.4 Vibration "A". When required the telescope shall
withstand a total of 270 minutes + 5 minutes of sweep-cycle
vibration. The vibration shall be applied for 90 minutes 2
minutes along each of the three mutually perpendicular major axes.
A complete sweep cycle shall consist of vibration from origin, 5
hz at 1 inch double amplitude, to mid-point, 5 g's 0.5 g's at
500 hz, to origin, and shall have a duration of 15 minutes 1
minute. Double amplitude shall be constant at 1 inch between 5 hz
and 10 hz, and varied with frequency to maintain a constant 5 g's
0.5 g's acceleration between 10 hz and 500 hz. Upon completion
of vibration, the telescope shall exhibit no evidence of damage
and shall meet the requirements of 3.7 through 3.14.
3.6.5 Vibration "B". Subsequent to meeting the requirements
of 3.7 the telescope shall be vibrated in a vertical plane at a
constant frequency of 30 + 5 cycles per second with an amplitude
of 1/16 inch (1/8 + 1/64 Inch total excursion) for a period of
five minutes 15 seconds, Subsequent to vibration, there shall
be no evidence of physical failure and the telescope shall meet
the requirements of 3.7 through 3.14.
3.7 Orientation. The requirements of 3.6 through 3.13.3\
inclusive, shall be met with the flat mounting surface of the
telescope horizontal, and the eyepiece elbow shall be positioned
perpendicular to the plane of the telescope locating keyways.
The Azimuth "Upper 6400 mil" and "Lower 6400 mil" counters shall
indicate 3200 mils, and lower right correction counter indicating
zero. With the head cover open, the line of sight shall be
horizontal and parallel to the plane of the locating keyways. The
line of sight shall be established by placing the telescope
reticle into coincidence with the collimator target reticle. Set
the 5 mil click lead knob for indirect fire out of the detent.
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