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MIL-M-50383A(MU) With vertical reticle line plumb proceed to auto-collimate
collimator in the sighting device.  This is accomplished by securing a
calibrated front surface mirror to a knee or parallel box by means of
spring clamps.  Position the knee or parallel box on a surface plate and
butt machine surface of the sighting device against parallel box or knee.
Engage the set pin in the zero setting position (indicating zero azimuth
position).  Using standard shop techniques, auto-collimate the collimator.
Auto-collimation is obtained when collimator's reticle is superimposed on
itself.  Recheck plumb of reticle. When both adjustments have been obtained,
secure by tightening set screws. Position the device on the mount's top seating surface,
engaging the locating keys in the machined keyway.  Secure by the means
provided.  Set fixture, mount and inspection aid adapter as outlined in  Sight through the collimator and align target lines A and B
(Figure III) to horizontal and vertical centerlines of collimator. Set
fixture to a cant angle (Table II).  Cant the mount an equal amount in the
opposite direction.  Cant the inspection aid adapter in the same direction
as that of the mount.  Set an elevation angle (Table II) into the inspection
aid. Position inspection aid on the seating surface of inspection aid
adapter.  Elevate fixture to position inspection aid level bubble to indi-
cate level.  Recheck crosslevel bubble of inspection aid adapter, relevel
if required.  Recheck level bubble of inspection aid and adjust by inducing
elevation into fixture. When all level bubbles indicate level (inspection
aid, inspection aid adapter and pitch level and crosslevel of mount) set
the sighting device to the corresponding azimuth correction (Table II).
Sight through the collimator and obseme coincidence between the intersecting
point target lines A and B and the intersecting point of reticle center-
lines.  They must coincide within the limits of 3.5.10. Any non-coincidence
to be measured on the target.  Repeat this procedure at each set of eleva-
tion and cant angles specified in Table II of 3.5.10. Operability.- Using standard shop type torque measuring
equipment with appropriate adapters, determine running torque values of
those controls listed in Table III.  Perform this test at the temperature
specified in Table III to assure conformance with 3.5.11.  Actual inspec-
tion to be performed using standard shop type inspection techniques.
4.6,3 Level vial illumination.- Place the instrument in a dark room
having a controlled light source.  The observer and instrument must become
dark adapted.  After being adapted to the darkness, the observer shall
visually examine the level vial bubble and the graduation.  They must be
clearly discernable to assure conformance with 3.6.  Gradually raise the
ambient level of light in the dark room one foot candle of illumination in
the area of the level vial.  The level vial and graduation shall be clearly
discernable to assure conformance with 3.6.
5.1 Packaging, Packing, and marking.- Packaging, packing, and
marking shall be in accordance with Packaging Data Sheet 10553215. The
level of protection shall be as specified in the procurement document.

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