MIL-DTL-48554B
4.11 Open sight. The line of sight shall be set at zero elevation. Excursion range
and plumb travel target (see Figure 3) shall be positioned approximately 8 feet from the
objective head window. The wall target shall be plumbed by a plumb line placed in front
of the wall target. Sight the target line through open sight. Record azimuth counter
reading. Look through telescope and bring reticle line in coincidence with the centerline of
the target. Take reading off azimuth counter; this reading shall be 13.25 mils greater than
the original azimuth reading (to compensate for the offset between the open sight and the
center of the objective window) plus or minus the tolerance limits specified in 3.12.
4.12 Torque. The running torque required to rotate the knobs and lever specified in
3.13, at standard ambient and extreme operating temperatures, shall be determined with a
calibrated torque measuring device. The torque measuring device shall be equipped with
the adapters shown in Table IV to fit the respective knobs and lever being tested. The
measured torque values shall be within the limits specified in 3.13.
TABLE IV. Knob adapters.
Knob
Adapter
Azimuth
11747952
Correction Counter
11747953
Boresight Adjustment
Screw Driver Tip (std)
Elevation
11747954
Clutch Release (Lever)
11747955
4.13 Direct force, elbow assembly. A standard force measuring device shall be
used for this test. Release the elbow detent lock pin and apply the force horizontally and in
the direction of movement adjacent to the eyepiece through the full extent of travel. This
test shall be performed in each direction. The force required to rotate the elbow assembly
in both directions shall not be greater than the values specified in 3.14.
4.14 Operability. The azimuth counter cover and latch, head cover and latch,
azimuth knob folding handle, the elbow detent lock pin, and the five mil click lead actuator
shall be operable as specified in 3.15 at room temperature and the extreme operating
temperatures specified in 3.3.2.
4.15 Counter numerals. A standard measuring scale shall be used to determine
numeral (digit) alignment to the respective index line within the linear value specified in
3.9.
4.16 Reticle illumination. The reticle illumination test shall be performed under
simulated conditions specified in 3.17.1. Place the instrument in a dark room having a
controlled light source. The observer must become dark adapted. Prior to performing the
test, place a white matted surface approximately 2 feet from the telescope window with the
objective cover open. Perform the test by observing the reticle pattern and determine that
this pattern is clearly discernible by means of the internal illumination source. Gradually
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