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Turret inflatable seal and pump |
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|  MIL-T-62222(AT)
3.5.2.7 Fording.
3.5.2.7.1 Shallow water. The vehicle shall ford a level, hard-bottom body of water 48 inches
in depth, including wave, without special equipment. With the vehicle standing in water
48 inches in depth for 30 minutes, the accumulation of water shall be not more than two inches
on the crew compartment hull floor measured in the center of the "V" (see 4.6.17.2.7.1).
3.5.2.7.2 Drain valves. After unlocking the lever, the force required to operate the front
drain valve lever shall not exceed 17 lb. This force measured at the end of the hand grip shall
cause the valve to travel at least 3/8 of an inch. After unlocking the lever, the force required to
operate the rear drain valve lever shall not exceed 25 lb measured at a point just below the knob.
This force shall actuate the valve and travel shall be not less than 11/16 of an inch
(see 4.6.17.2.7.2).
3.5.2.7.3 Turret inflatable seal and pump. The turret seal pump shall be capable of inflating
the seal to 25 psi. The force required to operate the pump plunger shall not exceed 50 lb
(see 4.6.17.2.7.3).
3.5.2.7.4 Engine start - shallow water. With the vehicle standing for 30 minutes in water up
to 48 inches in depth, and the engine operating at 1000 rpm for 15 minutes, then stopped for
15 minutes, the engine shall restart in not more than 3 minutes. All accessories shall function
satisfactorily during and after fording operations. After fording operations, the water
contamination content of the transmission, engine, final drives, and suspension system lubricants
shall be not more than 2 percent by volume (see 4.6.17.2.7.4).
3.5.2.7.5 Deep water. When the vehicle is specified with an installed fording kit (see 3.3.3)
the vehicle with fording kit installed shall ford a level, hard-bottom, body of water 96 inches in
depth. With the vehicle standing in water 96 inches in depth for 30 minutes, the accumulation of
water shall be not more than 2 inches on the crew compartment hull floor in the center of the "V"
(see 4.6.17.2.7.5).
3.5.2.8 Trench crossing. The vehicle shall cross trenches 36 inches in depth and 102 inches
in width without stalling or damage to suspensions, gun tube, and other vehicle equipment
(see 4.6.17.2.8).
3.5.2.9 Verticle obstacles. The vehicle shall cross over vertical obstacles 36 inches in height
while moving forward without stalling or damage to suspension and hull floor (see 4.6.17.2.9).
3.5.3 Turret and cupola.
3.5.3.1 Main armament balance. With the vehicle combat loaded, the main gun level, an
M457 dummy round in the main gun breech, without searchlight or searchlight bracket, the main
armament shall balance muzzle heavy within the range of 56 to 70 pounds foot (lb-ft)
(see 4.6.17.3.1).
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