MIL-PRF-62195D(AT)
3.3.7 Exhaust system. Concentrations of toxic fumes in the crew compartment shall not
exceed 50 parts per million (ppm) of carbon monoxide (CO) nor 5 ppm of oxides of nitrogen
(NOx) under all conditions of vehicle operation.
3.3.8 Controls. All electrical, mechanical, and hydraulic controls shall operate without
malfunction or interference throughout all ranges of operation under all vehicle operating
conditions.
3.3.9 Adjustment mechanisms. All adjustment mechanisms shall function properly and
maintain adjustment under all vehicle operating conditions.
3.3.10 Auxiliary power unit (APU). The APU shall consist of an engine conforming to
manufacturer's specifications, a hydraulic pump capable of delivering 6.9 gal/min at 1500 psi and
3000 revolutions per minute (rpm) pump input speed, and a generator system which is limited in
battery charging current to approximately 150 amperes (A) at 3000 rpm. The generator output
voltage shall be maintained between 27.3 and 28.7 volts direct current (V dc) under fully charged
battery conditions (battery charging current of less than 50 A). The APU shall be capable of
charging M88A1 vehicle batteries, or operating the auxiliary hydraulic circuit. Included in the
latter is raising the spade, stowing and raising the boom, hauling main winch and hoist cable, and
operating the impact wrench and the fuel transfer system.
3.3.11 Electrical system.
3.3.11.1 Generator voltage. The solid state voltage regulator shall control the generator
output voltage between 27.3 and 28.7 V dc under all conditions of vehicle operation.
3.3.11.2 Auxiliary generator controls. The auxiliary power unit, with its controls, shall be
capable of operating in environmental conditions as specified in 3.6.1. The voltage regulator as
specified in 3.3.11.3, when a part of the APU circuit, shall control the APU generator output
voltage between 27.3 and 28.7 V dc under fully charged battery conditions (battery charging
current of less than 50 amperes of direct current (A dc)).
3.3.11.3 Voltage regulator solid state. The voltage regulator shall be in accordance with
ATPD 2062, or equivalent.
3.3.11.4 Night vision device voltage supply. The voltage supply to the night vision
device shall be as follows:
a. When vehicle circuitry is equipped to accommodate the M24IR periscope, the high
voltage supply shall be in accordance with MIL-PRF-62071 and shall show no
evidence of high voltage arcing. The observed voltage shall be between 13.8 and
16.6 kilovolts (kV).
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