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MIL-H-45984B(AR)
Sight through the panoramic telescope and align the
reticle to the intersecting target lines C and D (Figure 1) with
the elevation and azimuth knobs.  Ascertain that the level vial
bubbles for pitch and cross-level bubbles for pitch and
cross-level are centered within the thickness (width) of a
-
graduation line and the azimuth counter reads 3200 mils.
k.  Set the reticle of the telescope M1.38 to the zero
position and align to the target intersecting lines E and F
(Figure l).  For reticle/target line coincidence, make all
adjustments with the boresight screws on the M172 mount.
The quadrant M18 level vial bubble shall be centered
l.
to thickness (width) of a graduation line with the elevation
reading at 0000 mils.  The cross-level vial bubble shall be
centered to thickness (width) of a graduation line when
boresight adjustments are set.
m.  Counter backlash may be eliminated by always making
the last movement in the elevation counter mechanism from high
to low.
n.  Backlash in the panoramic telescope M1.37 may be
eliminated by always approaching the target from left to right.
4.6.2.2  Gun elevation-plumb travel.  Each completely
assembled howitzer shall be tested through the elevation range
specified in 3.3.2.2.  The cannon tube shall track a plumb line
throughout the elevation range and deflection limit specified in
3.3.2.1.  Any howitzer which does not track plumb within the
specified limit shall be cause for rejection.
4.6.2.3  Alignment of mount M171., panoramic telescope M137
and quadrant M17.
a.  The cannon tube shall be set at zero elevation and
all level vial bubbles shall be centered within the thickness
{width) of a graduation line.
b.  The quadrant elevation level vial shall be adjusted
as necessarv and shall meet the requirements specified in
3.3.2.2.a.
c.  Subsequent to boresighting, the panoramic telescope
shall align on the M139 alignment device at 4800mils within the
limits specified in 3.3.2.2.b.  Remove the alignment device
before elevating the gun.
d.  The gun tube shall be elevated from zero to 1275 mils
in 200 mil increments.  The pitch and cross-level knobs shall be
rotated to relevel the mount and the level vial bubbles centered
21

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