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|  MIL-T-62222(AT)
4.6.4 Ventilation system.
4.6.4.1 Vent blower. To determine conformance to 3.4.3.1, the operation of the vent blower
shall be observed during road tests and when the vehicle is idling.
4.6.4.2 Carbon monoxide. To determine conformance to 3.4.3.2, tests shall be performed in
accordance with procedures specified in the USATECOM material test procedure 2-2-614, dated
18 June 1968, except as follows:
a. Firing tests shall be conducted with the ventilation system and engine operating, and
all hatches closed.
b. Main gun firing contamination levels shall be determined for one three round salvo
for each type of ammunition designated for the main weapon.
c. Secondary weapon contamination levels shall be determined for one 200 round burst
fired from each vehicle machine gun simultaneously.
CAUTION: When conducting these tests, safety precautions shall be exercised (see 6.3).
4.6.5 Controls. To determine conformance to 3.4.4, all controls shall be operated, adjusted,
and checked for functional requirements. The full requirement cannot be met until the vehicle
has been subjected to all specified environments and all control functions as specified.
4.6.6 Adjustment mechanisms. To determine conformance to 3.4.5, all adjustment
mechanisms requiring adjustment shall be checked for proper adjustment, function and proper
installation in accordance with applicable drawings.
4.6.7 Vision devices and receptacles. To determine conformance to 3.4.6, the vision device
receptacles shall be checked for the ability to receive and hold vision devices without binding or
interference; the gunner's periscope shall be checked for ability to maintain sighting capabilities
as specified.
4.6.8 Gas particulate system.
4.6.8.1 Air flow. To determine conformance to 3.4.7.1, the air flow at each crew position
shall be checked for 3.0 to 4.5 cfm flow with the gas particulate system operating and other crew
position outlets capped with a gas mask type air flow restricter.
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