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|  MIL-H-63192 (AR)
4.6.9.5 Quadrants M17/M18 elevation counter accuracy.-Prior
to proof firing, the elevation counters' accuracy shall not exceed
the deviation limit specified in 3.3.9.5, excluding backlash at
any cannon tube elevation setting.
Subsewuent to proof firing.
the deviation shall not exceed maximum limit specified in 3.3.9.5,
excluding backlash.
4.6.9.6 Backlash-quadrants M17/M18.-The elevation knobs on
each quadrant shall be tested for maximum allowable backlash at
any elevation setting.
Backlash tests shall be taken in clockwise
and counterclockwise directions.
Backlash measurements shall be
taken using a calibrated gunner's quadrant.
Backlash shall not
exceed the limit specified in 3.3.9.6.
4.6.9.7 Operability and illumination.-Mounted fore control
shall have a visual and tactile examination for knob function to
detect looseness, binding or excessive torque.
Counters shall
operate" properly and the numerals shall be legible and readable
at light levels ranging from dusk into darkness.
Level vial
bubbles and graduation lines shall be clear and discernible
at light levels ranging from dusk into darkness.
Radioactive
illuminated retitles in the panoramic and elbow telescopes shall
have clear and concise line patterns that are discernible at
light levels ranging from dusk into darkness.
Off carriage fire
control shall be examined in the same manner as indicated above.
4.6.10 Proof firing test.-The howitzer shall be emplaced,
layed and fired in accordance with the operating procedures
contained in PDTM 9-1015-248-10.
The projectile, charge zone and
elevation shall be in accordance with Table I.
4.6.11 Latch mechanism test.-During the proof firing test,
observation shall be made for compliance with the requirements
specified in 3.3.11.
4.6.12 Zone setter test.-During the proof firing test,
measurements shall be made to determine compliance with the
requirements specified in Table 11 of 3.3.12.
4.6.13 Road test.-The howitzer shall be prepared for
travel and engaged to a prime mover in accordance with TM9-1015-
248-10.
Observation shall be made for compliance with the
requirements specified in 3.3.13.
4.6.14 Boresight retention.-All lines of sight of the
optical instruments, including borescope, shall be secured in
coincidence with their respective arming points as defined in
4.6.9.1.
The exact position of the carriage shall be marked to
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