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|  MIL-T-45379D(AT)
3.5.9.8.6 Night vision. Actuation of the night vision channel switch of the commander's
M36E1 (passive) periscope shall remove the shutter from the optical path and shall provide low
light level operation, viewing and sighting through the night vision channel. Image brightness
shall be maximum with the tube control knob in the extreme clockwise position. The reticle
shall not be illuminated with the reticle control knob in the OFF position, and shall be of
maximum brightness with the reticle control knob in the extreme clockwise position
(see 4.6.4.9.8.6).
3.5.10 Electrical system.
3.5.10.1 105mm gun firing circuits. The 105mm gun firing circuits shall be capable of
providing the energy necessary [1.25 A for 100 milliseconds (ms)] to ignite a main round. The
firing circuit shall also provide the following (see 4.6.4.10.1).
a. The probe shall be grounded at all times, except during application of the firing
voltage.
b. The firing control circuits shall include the "dead man" switching feature which
prevents subsequently loaded rounds from detonating until the firing switch "trigger"
has been released after the previous round.
c. Interconnections shall be provided to allow firing circuit activation from the alternate
emergency switch on the manual elevation pump handle, and provide emergency
mode firing as in 3.5.10.2.
3.5.10.2 Emergency mode firing. In the event of a firing circuit failure, the blasting machine
shall be capable of firing the round (see 4.6.4.10.2).
3.5.10.3 Coaxial and cupola machine gun firing circuits. The machinegun firing circuits
shall be capable of providing the energy necessary (13 A) to operate their respective machinegun
solenoids (see 4.6.4.10.3).
3.5.10.4 105mm gun and machine gun circuit controls. The firing circuit controls will be
arranged and interlocked to allow the commander to fire the 105mn gun, the coaxial machine
gun, the cupola machine gun; and the gunner to fire the 105mm gun and the coaxial machine
gun. A safety switch, manually operated from the loader's station, shall open the firing circuit to
the 105mm gun from the commander's and gunner's station with the switch in the SAFE position.
These circuits shall be closed with the switch in the FIRE position (see 4.6.4.10.4).
3.5.10.5 Smoke grenade discharger circuits.
3.5.10.5.1 Arming. The power-on (ready) lamp in the grenade power box shall illuminate
when the master battery switch, the turret power switch, and the grenade system power switch
are all ON (see 4.6.4.10.5.1).
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