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|  MIL-H-63192 (AR)
b.
The quadrant elevation level vial shall be adjusted, as
necessary, to center the bubble when the cannon tube is at zero
elevation and the elevation counter is set at 0000.
3.3.9.5 Accuracy of elevation counters.
Prior to proof
firing, the elevation counter of the M17 and M18 quadrants shall
reflect tube elevation and shall not exceed 1.0 mil deviation,
excluding backlash, at any counter setting.
After proof firing,
the allowable deviation shall not exceed 1.5 mils, excluding
backlash.
The M18 cross level vial bubble shall remain centered
within + 1 mil (one full graduation) through all tube elevations.
3.3.9.6 Backlash.-Backlash
shall
not
exceed
1.0
mil
at
any elevation counter reading.
3.3.9.7 Illumination.-The reticle markings, counter numerals,
and level. vial bubble and graduation lines shall be clearly
distinguishable when observed in ambient light conditions ranging
from dusk into darkness.
3.3.10 Proof firing.-The howitzer shall withstand proof-
firing as specified in Table I with no evidence of any system
malfunction;
There shall be no structural damage, permanent
deformation or degradation of operating characteristics.
Testing
shall be as specified in 4.6.10.
TABLE I
Elevation
Proj
No. of
Prop
Zone
Charge
Rounds
(mils )
#10 mils
Ml
0
1
M67
3
.
Ml
400*
5
M67
3
Ml
800
8
XM200
3
3.3.11 Latch mechanism.-The latch mechanism shall retain
the recoiling parts in battery position. When a force is
applied to the lever/lanyard, the latch mechanism shall release
the recoiling parts for forward run-up.
Upon counter recoil
the latch mechanism shall catch and retain recoiling parts in
the battery position.
3.3.12 Zone setter.-The zone setter shall function such
that the over travel requirements of Table II are met and the
weapon latches.
8
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