MIL-T-45379D(AT)
3.3.1 Sealing. Unless otherwise specified herein all seats and sealer shall prevent the entrance of water and foreign matter. Static seals shall provide an interference fit of sealing surfaces preventing the loss/leakage of fluids intended to be contained by the seals. Dynamic seals shall prevent fluid leakage in the form of a drip (see 6.5) when the vehicle is standing idle. Evidence of lubricant at seals specifically designed to allow exit of flushed lubricants shall be permitted (see 4.6.2.1).
3.3.1.1 Hatch seals. Hatch seals shall prevent leakage of water into the crew compartment
(see 4.6.2.1.1).
3.3.1.2 Vision device/receptacle seals. When installed, the gunner's and commander's periscopes and the driver's vision blocks shall be sealed to prevent any entry of water into the vehicle. The driver's night vision viewer shall not permit water entry in excess of continuous drip into the vehicle (see 4.6.2.1.2 and 6.5).
3.3.2 Hydraulic lines. Provisions shall be made to assure internal cleanliness of hydraulic lines and connections (see 4.6.2.2).
3.3.3 Ventilation system. The ventilation system shall prevent concentration of carbon monoxide (CO) in the occupied portions of the vehicle in excess of 0.01 percent, under any condition of operations (see 4.6.2.3).
3.3.4 Controls. When installed in accordance with applicable drawings, all electrical, mechanical, and hydraulic controls shall operate without malfunction throughout all ranges of operation under all vehicle operating conditions (see 4.6.2.4).
3.3.5 Adjustment mechanisms. When installed and adjusted in accordance with drawings, all adjustment mechanisms shall function properly, and maintain adjustment settings during all vehicle operating conditions (see 4.6.2.5).
3.3.6 Vision devices/receptacles. Provisions shall be made to assure that receptacles incorporated in the vehicle will accept applicable vision devices without binding or interference. The gunner's and commander's periscope receptacles shall accept the periscopes, and, when the periscopes are installed, removed and reinstalled, the line sight of the periscopes shall not deviate more than 0.2 mil from the line of sight of initial installation setting (see 4.6.2.6).
3.3.7 Gas particulate system.
3.3.7.1 Air flow. The air flow shall be 3.0 to 4.5 cubic feet (cu ft) per minute at each crew position outlet when the other crew position hoses are connected to their connector orifice assemblies (see 4.6.2.7.1).
3.3.7.2 Air heater. When the air heater at each crew position is operated, the heater light shall illuminate, and the heater shall warm the air at least 10 degrees Fahrenheit (°F) over ambient within 10 minute period at an input voltage range of 24 to 30 volts (V). Thermostats of each heater shall function to maintain temperature settings of their control knobs (see 4.6.2.7.2).
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