PS Magazine - TB 43-PS-579

PS, The Preventative Maintenance Monthly

ISSUE 579

FEBRUARY 2001
PS Magazine - TB 43-PS-579 - Page 11 of 33
M992A2 Ammo Carriers . . .
T
he fire sensors in your M992A2
ammo carrier are very sensitive instru-
ments, crewmen. How you care for them
directly affects how well they care for
you.
Never use a rag—even a clean one—
to wipe the sensor glass. It scratches the
glass and can cause a false alarm.
Worse yet, the sensors may not function
during a fire when they’re really needed.
The sensors should be cleaned only
with isopropyl alcohol, NSN 6810-00-
753-4993, and lint-free foam wipes,
NSN 7920-00-184-9014 gets a package
of 25 wipes.
The next time you wash out your car-
rier, don’t close up the vehicle while it’s
still wet. If you do, the water will evap-
orate and then condense on the fire sensors.
The sensors are sensitive to direct and
reflected sunlight even when they’re dry.
When a sensor is wet, the beads of water
act like tiny magnifying glasses that
intensify any light that hits them.
PS 579
FEB 01
18
Combat Vehicles . . .
M
echanics, just like oil won’t mix
with water, different metals don’t mix,
either.
If, for example, you put a steel bolt or
screw into a hole with aluminum
threads, the two metals react to each
other to form corrosion. When it’s time
to remove the bolt, it either won’t budge
or the bolt snaps.
Since you have to use the parts called
for in the TMs, try coating the threads of
bolts and screws with antiseize com-
pound before using them. The com-
pound forms a barrier between the metals
that prevents corrosion and makes the
hardware easier to remove later.
It’s a good idea to use antiseize com-
pound even when the bolt and threaded
hole are made of the same metal. Same
metals don’t react to each other, but rust
can still form if the fasteners get wet.
Always use the antiseize compound
called for in your -20 TMs. You’ll find it
in the expendable/durable supplies and
materials list appendix. If there’s none
listed, order a 1-lb can with NSN 8030-
00-251-3980.
So, if light hits a sensor
from an open hatch the next
time you start your vehicle, it
could trigger the fire suppres-
sion system. Prevent that by
letting the vehicle’s interior
dry out by leaving the hatches
open after washing.
Keep fire
sensors
clean
and dry
PS 579
FEB 01
19
579. 18- 19 (C)
1/11/01
1:36 PM
Page 1
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