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Figure I. Excursion range and plumb travel target
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Telescope, Panoramic: M137 and M137A1
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Boresight  retention



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MIL-T-48554A(AR)
the telescope shall be observed with respect to the zero elevation
line on the target.  line on the target. The telescope reticle shall track the zero
elevation line on the target within the tolerance specified in
3.11.2.3 for at least two revolutions in azimuth.
4.8.6 Lift. The vertical and horizontal lines on the
telescope reticle shall be positioned on the collimator target as
in the initial position of 3.7. The azimuth knob shall be
rotated, first in one direction and then in the reverse direction.
Lift is indicated if the line of sight is vertically displaced
from the original zero elevation setting, and it shall not exceed
the tolerance specified in 3.11.2.4. This examination shall be
repeated at the 3200, 4800, 6400, and 1600 mil settings.
4.8.7 Five mil click mechanism. Set the lead actuator knob
in the Direct fire position and rotate the azimuth knob through
the full range of operation. During rotation, a tactile
examination shall be made to feel the detent action required in 5
mil increments. An audible examination shall be simultaneously
performed to listen for a distinct click resulting from positive
detent seating. At least five readings throughout the range of
operation, the displacement from one increment setting to the next
shall represent a 5 mil angular change within the tolerance
specified in 3.11.2.5. All the above examinations shall be
performed at standard ambient temperature (+60 +90F) and the
extreme operating temperatures of 3.6.2 to determine compliance
with 3.11.2.5.
4.8.8 Backlash  (azimuth). The azimuth knob shall first be
rotated in one direction to bring the vertical line of the
telescope reticle in coincidence with the azimuth zero point on
the target. Record the reading of the azimuth counter and
deflection or bearing counter. continue the rotation of the knob
in the same direction, one complete turn, then reverse the
direction of the knob while sighting through the telescope,
reposition the vertical reticle line of the telescope in
coincidence with the azimuth zero point on the target, without
overtravel. Take readings from the azimuth counter and the
deflection or bearing counter then compare them with the original.
set of readings for any difference in the amount of backlash in
the azimuth mechanism. The backlash shall not exceed the
tolerances specified in 3.11.3.1 when checked at 3200 and zero
mils.
4.8.9 Backlash
(elevation). The test for backlash in the
elevation mechanism shall be accomplished concurrently with the
tests indicated in 4.8.1 and 4.8.2. The horizontal reticle line
of the telescope shall be brought into coincidence with the
horizontal target line, at zero elevation without overtravel, when
the elevation knob is rotated in a clockwise direction. The zero
line on the knob and the index line on the rotating head shall be
set in alignment with each other. Rotate the elevation knob
19

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