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|  MIL-T-45379D(AT)
3.3.14.4 Loader's seat. When the loaders seat assembly is properly installed and not in use,
the lifting spring shall be capable of raising and retaining the seat base in a vertical position
(see 4.6.2.14.4).
3.3.15 Fire extinguisher. The fixed fire extinguisher system, when installed in accordance
with applicable drawings shall be readily accessible for operation internally and externally.
Actuating the internal controls shall simultaneously stop the supply of fuel to the engine. The
maximum effort required to discharge the system either internally or externally shall be not more
than 55 lbf ft. A time delay of more than 6 seconds but less than 11 seconds shall occur between
actuating of the release mechanism and entrance of carbon dioxide (CO2) into the engine
compartment (see 4.6.2.15).
3.3.16 Battery access door. The latch that holds the battery access door closed shall function
properly, and the force required to open the latch shall not exceed 15 lbf ft sliding pressure
(see 4.6.2.16).
3.3.17 Electrical system. The vehicle electrical system shall consist of the hull electrical
subsystem and the turret and cupola electrical subsystems as described below.
3.3.17.1 Power plant electrical. The engine electrical installation shall contain units
necessary to provide engine data in the form of electrical signals to the driver's instrument panel
as required and shall include an engine electrical disconnect to facilitate engine removal and
replacement, an electrical starter motor capable of starting the engine under all required
conditions, and an oil cooled rectified alternator (see 4.6.2.17.1).
3.3.17.2 Lights. The internal and external lights shall operate as specified on applicable
drawings through all vehicle operating conditions. All electrical contacts and connections shall
maintain positive contact under all vehicle operating conditions (see 4.6.2.17.2).
3.3.17.3 Interior lighting. Each crew position except the commander's cupola shall contain a
domelight to provide general illumination to assist with tasks at night or during closed-hatch
operation. The domelight shall contain provisions for adjusting light intensity and a red filter for
night vision adaptation (see 4.6.2.17.3).
3.3.17.4 Hull-to-turret slipring. The hull-to-turret slipring shall provide power and signal
circuits capable of maintaining positive electrical contact between the hull and turret electrical
subsystems under all vehicle environments. A sealed air passage in the slipring shall be capable
of carrying low-pressure air for the gas particulate subsystem (see 4.6.2.17.4).
3.3.17.5 Cupola slipring. The slipring assembly shall provide uninterrupted continuity of
7 electrical circuits between the turret and the cupola (see 4.6.2.17.5).
8
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