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|  MIL-G-45981(WC)
i.
Insert the muzzle adapter from the boresight kit into the
muzzle of the No. 1 barrel.
Install the boresight telescope in the mandrel assembly.
j.
and secure with socket head screws on the mandrel assembly.
k.
Insert the mandrel assembly into the muzzle adapter with
the eyepiece of the telescope in the horizontal position
and press to tighten the adapter and mandrel assembly in
the barrel.
Release the two azimuth drive motor brakes and the elevation
l.
drive rotor brake by positioning the brake release levers
perpendicular to the motor axis.
m.
Sight through the boresight telescope on a distant point.
Rotate the mandrel assembly and boresight telescope 90
degrees to the horizontal position on the opposite side of
the barrel. Sight through the boresight telescope to de-
termine that the point sighted initially is still at the
cross hairs. If the point is not on the cross hairs, the
boresight kit is defective, improperly assembled or improp-
erly mounted.
n.
Manually position the gun so the cross hairs of the bore-
sight telescope are level with and 3.5 mils to the right of
the distant aiming point.
o.
Lock the azimuth and elevation drive motor brakes and check
that the gun is still properly aimed.
Manually uncage the sight.
p.
q.
Adjust the LAMP control assembly for a clear reticle in
the sight.
r.
Remove only the front and right caps on top of the M61
sight.
Adjust the socket head bolts on top of the sight to center
s.
the inner reticle of the M61 sight on the distant aiming
point. The front adjustment is for elevation and the right
adjustment is for azimuth. Move the eye up and down and
right and left to check for parallax. If excessive parallax
is experienced, refer the sight to organizational main-
tenance. Note: A second crew member must check through the
boresight telescope while the adjustments are being made to
assure that the gun does not move.
t.
Install the caps on the sight. Note: When boresighting the
M134 sight, it is necessary to release the clamping screws
in front and rear end of left wall of the M164 Mount.
View through the M134 sight and adjust the AZ boresight
u.
adjusting screw to bring the cross of the reticle into hor-
izontal alignment with the distant aiming point.
v.
View through the M134 sight and adjust the EL boresight
adjusting screw to bring the cross of the reticle into
verticle alignment with the distant aiming point.
20
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