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|  MIL-T-45379D(AT)
3.5.6.6 Drain valves. After unlocking the lever, the force required to operate the front drain
valve lever shall not exceed 17 lbf ft at the end of the hand grip to actuate the valve through a
0.375 inch travel. After unlocking the lever, the force required to operate the rear drain valve
lever shall not exceed 25 lbf ft at a point just below the knob, to actuate the valve through a
0.6875 inch travel (see 4.6.4.6.6).
3.5.7 Trench crossing. The vehicle shall cross trenches 36 inches in depth and 102 inches in
width without stalling or damage to the suspension, gun tube and other vehicle equipment
(see 4.6.4.7).
3.5.8 Vertical obstacles. The vehicle shall cross over vertical obstacles 36 inches in height
while moving forward without stalling or damage to the suspension and hull floor (see 4.6.4.8).
3.5.9 Turret/cupola.
3.5.9.1 Nylon ballistic shield. The gun mount conforming to MIL-M-45212 with coaxial
machine gun mount, MAG 58 machine gun, spent brass and link ejection bag, sighting system
and the nylon ballistic shield installed, shall elevate at least between the limits of 200 elevation
and 10 depression. No binding shall exist between the machine gun, the sighting system and
the nylon ballistic shield, to cause the coaxial machine gun to deflect by more than 0.5 mil and
the telescope to deflect more than 0.1 mil (see 4.6.4.9.1).
3.5.9.2 System backlash. With the elevation and traverse power switch on or off, the-control
system backlash shall not exceed 1 mil in traverse and 1 mil elevation (see 4.6.4.9.2).
3.5.9.3 Turret and gun control system. The turret and gun control system shall be capable of
operating at vehicle supplied 18 to 30 V dc and shall meet all requirements specified herein with
the following operating conditions (see 4.6.4.9.3):
a. The turret shall be level within one degree.
b. The vehicle electrical system shall supply at least 26.8 V dc to the turret and gun
control system with the engine operating and the generating system ON.
c. The main armament shall be balanced muzzle heavy within a range of 56 to 70 lbf ft.
3.5.9.3.1 Gun elevation speeds. The gun shall be controllable in elevation and depression
over a speed range of at least 0.5 mil per second to 71 mils per second (4 per second). The
steady speed after acceleration shall continuously increase with increasing handle displacement;
these requirements apply to both stabilized and nonstabilized operation and to both gunner and
commander power controls (see 4.6.4.9.3.1).
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