PS Magazine - TB 43-PS-665
PS, The Preventative Maintenance Monthly
ISSUE 665
APRIL 2008
44
PS 665
APR 08
T
he shock mounts that support the engine and alternator on MEP-903A, -B and -C
10-KW auxiliary power units (APU) are taking a beating and not rebounding from it.
The MEP-903A is used in the standard integrated command post system (SICPS)
shelter. The MEP-903B is used in the joint tactical area communications system
(JTACS) shelter. The MEP-903C is used in the warF
ghter information network-tactical
(WIN-T) shelter.
The shock mounts are on the APU to help isolate the vehicle and shelter from the
APU vibration. This reduces noise and discomfort for the soldier.
The vibration isolators provide the maximum isolation when the generator is
running, but still protect the APU from damage when it’s transported. When shock
mounts/vibration isolators fail, the APU operating noise increases and the potential for
generator set damage during transportation increases, too.
It’s a Vicious Circle!
Chapter 4 of TM 9-6115-670-14&P covers the
PMCS for the APU. Part of your PMCS is to, “Check
for unusual wear or deterioration.” Make a note that
one of the areas to check are the four shock mounts–
two on the engine and two on the alternator.
What you’re looking for with this visual inspec-
tion is a collapsed mount. The normal height of the
mount under load is about 1
1
/
4
inches measured
from the top of the shock mount to the top of the
mounting base.
Dear Half-Mast,
I was wondering how I can get my
hands on a simulator program for loading
and using the SINCGARS radios?
SSG E.J.M.
A failed shock is compressed so much that
the rubber elastomer touches the top of its
mounting base.
If you need to order a new mount for the
engine, use NSN 5342-00-597-6190. If you
need a new mount for the alternator, use NSN
5342-00-684-9456. Don’t mix the shocks!
They have different dampening characteristics
that match the needs of the load.
Dear Sergeant E.J.M.,
That’s the kind of wondering we endorse! First, get your hands on your computer
keyboard and type in:
This is the LandWarNet eUniversity-Signal website. Once there, you’ll need to
create an account in order to log in.
After you log in, click on Popular Downloads. A list will show up. Expand that
list and you’ll ±
nd several computer-based SINCGARS training programs you can
use and copy. They include SINCGARS Multimedia Instruction,
SINCGARS Radio Operation and Loading SINCGARS.
MEP-903A, -B, -C…
Is the
APU
Shocked?
Training…
Simulating
SINCGARS
Or has it failed?
Is your shock normal?
t-t-tell
muh-me-a-
about it!
my shocks
are shocking
again!!
665.44-45.indd
1-2
2/21/08
5:38:15 PM
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