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Fire extinguisher control check |
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|  MIL-V-62008B(AT)
If any boresight knob has to be moved more than values specified to bring the line of
eight of an instrument "dead on" target, one more determination of retention shall be
made after another 8 miles of operation. All instruments shall maintain boresight.
4.5.2.9 Boresight retention test, machine gun sighting system. To determine
conformance to 3.6.17.4, the following procedure shall be followed:
a. Prior to 8 mile road test (see 4.5.1.1), the vehicle shall be positioned at least
600 meters from clearly defined target.
b. Gun shall be placed "dead on" target by laying from low to high without over
travel.
c. The periscope reticle shall be placed "dead on" same target chosen in b.
Boresight knobs shall be locked in this position and micrometer scales slipped
to their nominal position.
d. Eight mile road test shall be performed.
e. Vehicle shall be returned to position established in a.
f. Step b shall be repeated.
g. The boresight knobs, excluding boresight, knob backlash, of the periscope
shall be used if necessary to position its reticle "dead on" target and the error
determined from boresight knob scale reading. Boresight retention shall be
within the tolerance specified in 3.6.17.4.
If either boresight knob has to be moved more than the value specified to bring the line of
sight of the periscope "dead on" target, one more determination of retention shall be made
after another 8 miles of operation and the periscope shall maintain boresight.
4.5.2.10 Vehicle hydraulic system fluid test. To determine conformance to 3.6.18.6 the
hydraulic oil in the vehicle control system shall be tested for water contamination and
cleanliness.
4.5.2.11 Fire extinguisher control check. To determine conformance to 3.8, one vehicle
per month shall have the fire extinguisher test for operation. With the engine idling at 700 to
800 rpm, the internal control shall be pulled with a maximum effort of 55 pounds using a force
gage. The first shot shall actuate one cylinder. After a time delay of not more than 11 seconds,
the engine shall have stopped and the system shall begin discharging CO2 into the engine
compartment and in the center of the engine "V". After returning the handle to its original
position, a second actuation shall discharge the remaining two cylinders of CO2. Removal and
weighing of each CO2 cylinder after test shall show a minimum of 10 pounds CO2 discharged
during test (see 6.3).
4.5.2.12 Gas particulate filter system test. To determine conformance to 3.9.1 and 3.9.2,
the existing ambient temperature shall be recorded and all crew outlets shall be opened. The air
flow at each outlet shall be checked and shall be as specified. When the temperature has risen
10 and proceeding conditions have been specified, the heater shall be considered properly
installed.
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