PS Magazine - TB 43-PS-629

PS, The Preventative Maintenance Monthly

ISSUE 629

APRIL 2005
PS Magazine - TB 43-PS-629 - Page 25 of 33
Crews operating in Iraq should
remember that the NBC centrifu-
gal fans are designed to run in
temperatures up to 120°F. But in
hotter weather, the fans may burn
out. If it’s over 100°, rig a shade
for the fan to keep it out of
direct sunlight.
Seal any seams and openings with
the synthetic rubber adhesive.
Reinstall the fan assembly after the
adhesive is thoroughly dry. See
TACOM-SBC maintenance advisory
message 04-013-014 for more info.
James Pratt
Ft Huachuca, AZ
PS 629
APR 05
46
Shelters…
Dear Editor,
The NBC centrifugal fan, NSN 4140-01-234-8170, that’s used on
many shelters doesn’t have much protection from the elements. It has no
gaskets or seals to seal out dust and moisture. Operating in the desert,
the fan can quickly fill with sand and shut down. Moisture can kill it just
as quickly in a rainy area. If the NBC centrifugal fan stops working, the
van loses the positive pressure that shuts out chemical agents in an
attack.
A little PM and synthetic rubber adhesive, NSN 8040-00-843-0802,
can give NBC centrifugal fans and shelter crews much more protection.
Remove the fan assembly from its mounting bracket and then remove
the heat sink assembly from the fan assembly. Be careful not to damage
the wire harness connecting the heat sink to the fan. Use compressed
air to blow out any sand in the fan. Reinstall the heat sink.
Editor’s note:
We are a fan of your suggestions. All shelter crews should
immedi-
ately
blow out and seal NBC centrifugal fans. Some of the shelters that use the fan
are the AN/TSM-191(V)2 electronic shop, AN/TSQ-179(V) Target Acquisition
Subsystem, Theater High Altitude Air Defense, and the AN/TPQ-36 and AN/TPN-31
radar sets.
If you have any questions about how to do this, contact TACOM-SBC’s Steve
Sutton at DSN 793-1687/(309) 782-1687 or email
steve.sutton@us.army.mil
Remove screws around access cover
Blow out sand with
low-pressure air hose
Seal these areas with adhesive
Shade fan in extreme heat
…I’m a
goner!!
uh-oh. my
nbc centrifu-
gal fan just
plugged up
with sand…
629.46-47(C)
2/25/05
1:48 PM
Page 1
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