PS Magazine - TB 43-PS-688
PS, The Preventative Maintenance Monthly
ISSUE 688
MARCH 2010
44
PS 688
MAR 10
45
PS 688
MAR 10
Take a look at your TQGs and see if you have this fuse… or if you
don’t!
Dear Editor,
I am an ILS manager for the long range scout surveillance system
(LRAS3) AN/TAS-8(V)1 & (V)2. I need to get the word out to units
using LRAS3 systems that there is one,
and only one,
battery to use to
maintain the GPS crypto data when the system is off. That battery is the
non-rechargeable, BA-5372/U, NSN 6135-01-214-6441.
Some of you are trying to use a regular 3V lithium ion battery.
This
battery does not work!
The right battery has reverse polarity. The
positive end of the battery is flat and the negative end is pointed.
If you use the wrong battery, you will damage the system and lose the
GPS data when no power is being applied to the sight sensor. This means
the crypto load in the GPS is lost. Without crypto, the GPS system
cannot transition to the precise positioning service, resulting in reduced
GPS and target location accuracy.
So, all operators, maintainers, warrants and sensor LARs, make sure
there are plenty of BA-5372/U batteries on hand for each LRAS3 and
that everyone involved in switching out an LRAS3 battery knows not to use
a different 3V lithium ion.
Robert E. Youngblood
LRAS3, ILS Manager
Ft Belvoir, VA
H
ave you noticed an extra
fuse in the excitation circuit
of your MEP-804A, MEP-
805A or MEP-806A tactical
quiet generator (TQG)? New
generators, and those coming
out of RESET, should have
that extra fuse.
Why?
The voltage regulation
system on these generators
can fail and damage the main
alternator windings. The new
fuse protects the alternator
from that damage.
Editor’s note:
As always, Robert, you have
good, absolutely need-to-know info for LRAS3
users. Users, Fnd a way to make reading this
info a permanent part of the backup battery
replacement routine.
NSN
Part
Buss fuse holder
Fuse
Spade terminal
Disconnect terminal (2)
Wire (1 Ft)
Screw
Wire ties (3)
If you don’t, get a copy of TB 11-6115-741-24 through regular pubs’ channels,
your CECOM LCMC LAR or the LOGSA website:
Paragraph 5.3 of that TB lists 15 steps for installing the new fuse.
AN/TAS-8(V)1 & (V)2 LRAS3…
15-, 30-, 60-kW TQG…
Excite
Circuit
Fuse
Modification
Use the
RiGHT
GPS
Battery!
here are
the parts
you will
need…
I’m
all shook up
now that I’m in
generators.
688.44-45.indd
1-2
2/1/10
11:46:35 AM
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