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Boresight  retention
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Telescope, Panoramic: M137 and M137A1
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Counter  illumination



img
MIL-T-48554A(AR)
shall not have changed more than the specified limit in 3.11.4.6. 3.11.4.6.
This test shall be repeated in the "R" direction.
4.8.16 Open  sight. The line of sight shall be set at zero
elevation. Wall target (see Figure 1) 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. The line of sight through the open sight shall be
parallel in deflection to the optical line of sight within the
tolerance limits specified on the wall target and 3.11.5.
4.8.17 Torque. The running torque required to rotate the
knobs and level specified in 3.11.6, at standard ambient and
extreme operating temperatures, shall be determined with a
standard torque measuring device. The torque measuring device
shall be equipped with the following adapters to fit the
respective knobs and lever being tested. The measured torque
values shall be within the limits specified in 3.11.6.
KNOB
ADAPTER NUMBER
Azimuth
11747952
Correction  Counter
11747953
Boresight Adjustment
Screw Driver Tip (std)
11747954
Elevation
Clutch Release (lever)
11747955
4.8.18 Direct
force.
4.8.19 Elbow  assembly. A standard force measuringt device
shall be used for this test. The force required to rotate the
elbow assembly in both directions shall not exceed the values
specified in 3.11.7 and 3-11.7.1.
4.8.20 Operability. The azimuth counter cover and latch,
head cover and latch, azimuth knob folding handle, the elbow
detent lock pin, and the 5 mil clock lead shall be operable at
room temperature and the extreme operating temperatures specified
in 3.6.2 and 3.11.7.2.
4.8.21 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 3.12.
4.8.22 Reticle  illumination. The reticle illumination test
shall be performed under simulated conditions specified in 3.13.1.
Place the instrument in a dark room having a controlled light
source. The observer and instrument must become dark adapted.
Prior to performing the test, place a shite matted surface
approximately 2 feet from the telescope window. Perform the test
by observing reticle pattern and determine that this pattern is
clearly discernible by means of the self-illuminating source in
21

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