PS Magazine - TB 43-PS-578
PS, The Preventative Maintenance Monthly
ISSUE 578
JANUARY 2001
etting a built-in-test (BIT) warning light on the fire control panel of your
MLRS is a real drag. It means you’ll be spending a lot of your valuable time
trying to find out what caused the problem.
Before you go through any extensive
troubleshooting, check the ground straps
for all line replaceable units (LRUs). A
loose mounting nut or corroded connector
means the LRU loses its ground. On comes
the BIT light associated with that LRU.
If you spot problems, call in your me-
chanic. He’ll clean and tighten the strap
and give it a light coat of varnish, NSN
8010-00-180-6343. That’ll keep the cor-
rosion from coming back.
After you reset the fire control panel
the BIT light problem should be cleared up. If not, start your troubleshooting
procedures.
MLRS Launcher . . .
Since the connectors are off anyway, give them a spray of electrical contact
cleaner, NSN 6850-01-393-7433. Then scrub them out with a clean cloth.
With clean connectors, those new LRUs have a much better chance of doing
their job when you hook ’em up.
...so clean with electrical contact cleaner
Dirt and water can ruin LRU conectors.
..
oh, great!
another
bit
warning
light!
no sweat!
it's just a
dirty ground
strap
!
i finally
got that
new
lru
in and
hooked up!
yeah, but
since you didn't
clean my connectors
first, it probably
won't work.
Ground strap corroded?
rewmen, when a line replaceable unit (LRU) goes bad on your MLRS launcher,
you have to replace it. Since the LRUs are heavy and hard to reach, it’s not much
fun, is it?
You can lessen the chance that you’ll have to replace the replacement by
cleaning the LRU connectors before hookup. Dirt and moisture get inside the
connectors and cause faults that shut you down.
PS 578
41
JAN 01
PS 578
40
JAN 01
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