PRACTICE EXERCISE (Continued)
3.
While performing an operational check on the purge device, you observe that you cannot
pull a vacuum with the pump. What would be the corrective action you should take?
a.
Replace vacuum hose set.
b.
Replace vacuum pump.
c.
Replace device housing.
d.
Check nitrogen supply.
4.
Purging of the night vision goggle AN/PVS-7B is required under all of the following
conditions except?
a.
When optics become fogged or misted.
b.
When battery hatch seal and knob kit is replaced.
c.
Anytime the unit is opened beyond a seal or O-ring.
d.
Replacement of the eyepiece assembly.
5.
While performing the purge and fill procedures, you observe that you cannot get a steady
reading of greater than 20 inches of Hg. What action should you take?
a.
Replace purge device.
b.
Adjust nitrogen flow.
c.
Replace purge adapter.
d.
Torque all housing screws.
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