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|  MIL-T-45379D(AT)
4.6.4.10.2 Emergency mode firing. To determine conformance to 3.5.10.2, the blasting
machine circuits shall be checked for sufficient power to fire the 105mm gun.
4.6.4.10.3 Coaxial and cupola machine gun firing circuits. To determine conformance to
3.5.10.3, a 13 A load shall be connected at the output of each machine gun firing circuit and the
voltage across each load shall be tested for the presence of vehicle voltage as each respective
firing trigger is actuated.
4.6.4.10.4 105mm gun and machine gun circuit controls. To determine conformance to
3.5.10.4, the commander's controls and the gunner's controls shall be checked for ability to fire
the weapons specified.
4.6.4.10.5 Smoke grenade discharger circuits.
4.6.4.10.5.1 Arming. To determine conformance to 3.5.10.5.1, operate the master battery
switch to ON, the turret power switch to ON, and the grenade system power switch to ON, and
verify that the power-on (ready) lamp in the grenade power box illuminates. Operate the grenade
system power switch to OFF and verify that the power-on (ready) lamp is extinguished.
4.6.4.10.5.2 Circuit voltage. To determine conformance to 3.5.10.5.2, arm the circuit as
specified in 4.6.4.10.5.1, and verify that the power-on (ready) lamp is illuminated. Actuate the
RIGHT firing pushbutton and verify that the voltage on the smoke grenade discharger pins
shown in figure 6 is as specified in 3.5.10.5.2. Actuate the LEFT firing pushbutton and verify
that the voltage on the smoke grenade discharger pins is as specified. Return power-on (ready)
switch to OFF and verify that voltage is not present on any of the firing pins. When the smoke
grenade dischargers and pushbutton unit are not installed on the vehicle, the external firing
circuits at the external connector shall be checked on each vehicle by inserting appropriate
switching leads at the internal control point. The complete installation shall be checked on a
control basis in conjunction with BII tests of 4.6.2.8.
4.6.4.11 Reliability. Vehicle reliability shall be tested to determine conformance to 3.5.11.
4.7 Environmental.
4.7.1 High temperature. To determine conformance to 3.3.11.1 (cooling system) and 3.6, the
completed vehicle, properly serviced and equipped, shall be subjected to the high temperatures
specified herein and observed for performance heating conditions and cooling system operation.
During high temperature performance checks, the engine oil temperature shall be monitored at
the oil cooler inlet. Engine oil and transmission oil temperatures shall not exceed that specified
in 3.3.11.1. With the vehicle operating in an ambient air temperature of 115F and a cooling air
intake grille restriction not exceed 2-inch H2O measured between cylinders and with a cooling
air exhaust restriction not exceeding 4 inches H2O measured above the cooling fans, for all
transmission gear ranges above 0.3 maximum speed ratio point, the vehicle shall meet the
performance requirements. When specified (see 6.2), storage tests in accordance with
MIL-STD-810 shall be performed.
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