PS Magazine - TB 43-PS-635
PS, The Preventative Maintenance Monthly
ISSUE 635
OCTOBER 2005
PS 635
OCT 05
5
M1A1 Tank…
Which Check Checks Out?
M
echanics, when it’s time to
run the semiannual PMCS sta-
bilization system check that’s
on Page 2-14 of TM 9-2350-
264-20-2-1, the right check
can make all the difference.
There are several different
turret networks boxes (TNB)
in use and not all of them take
the same diagnostics check.
If you have the redesigned
TNB,
NSN 5975-01-512-
7760, that comes with embed-
ded diagnostics (ED), use the
Maintenance Support Device
to run the M1A1 full diagnos-
tics IETM 1800 test. You’ll
find it listed on Page 3-1632
of TM 9-2350-264-20-2-2.
PS 635
OCT 05
4
M1-Series
Tanks…
t
he old way of doing things isn’t always the best way, mechanics. That’s why
TACOM made some changes to how and when you service the NBC sponson box
on M1-series tanks.
The old annual service
wasn’t complete enough.
Nor was it able to keep up
with dirt and moisture
buildup problems. That
buildup can eventually
result in system failure and
even an NBC filter fire.
Change 1 (8 Sep 03) to TM 9-2350-264-20-1-5 makes servicing the NBC spon-
son a semiannual task. The TM change also added some new maintenance proce-
dures, including:
•
removing the particle separator and precooler
•
inspecting the heat exchanger
•
removal of the heat exchanger and condenser for cleaning
•
inspecting the fan side of the air cycle machine (ACM) for rust
The new and modified services will take a few extra hours to perform, so plan
ahead and take no shortcuts.
Dirt and
moisture
buildup
in NBC
sponson
can lead
to NBC
filter fire
it’s
full of
water
and
dirt!!
you’ll have
to wait a few
more months!
not any-
more!
nbc
sponson
services
are now
semiannual
tasks!
Out With the
Old
NSN
5975-01-
316-9270
459-9483
476-6482
512-7760
TNB
M1A1 without
driver’s hatch interlock
M1A1 with
driver’s hatch interlock
M1A1 AIM without
RTNB/ED
M1A1 AIM with
RTNB/ED
Usable-
on Code
J94
J94
BGO
BGO
hey! it’s time to
run my turret
networks box
semiannual
diagnostics!
yeah…
but what
kind of
tnb do
you have?
tanks with
TNBs that do
not have ED
should be
checked using
the STE-1800
test on Page
3-949 of TM
9-2350-264-
20-2-2.
That
includes the
following
TNBs…
my nbc
sponson
needs a
service!
that’s
an
annual
service!
635.04-05(C).qxd
9/3/05
9:15 AM
Page 1
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