PS Magazine - TB 43-PS-632
PS, The Preventative Maintenance Monthly
ISSUE 632
JULY 2005
Check the Oil
The ECU/PPU engine often
doesn't have a heavy enough
load. The result is wetstacking
where oil is thrown into the
exhaust system. That not only
creates a mess, but it also means
the oil level drops. If it drops too
much, the engine is damaged.
Check the oil daily in the field
and add oil if necessary.
PS 632
JUL 05
11
Check the Hose
That’s the hose running from the fuel pump to the fuel filter. Some units have had
trouble with the hose rubbing on the heat shield and eventually developing a leak. If
that's a problem, cut off one inch of the hose and reinstall it. That should keep the
hose out of the way of the heat shield.
F
or sure you don't want the Avenger's ECU/PPU (environmental control unit/pri-
mary power unit) to fail, especially in the desert heat of Iraq. No ECU/PPU means
no fresh, cool air for you in the turret and you quickly turn the color of a ripe toma-
to. Here's what you can do for your ECU/PPU:
Measure ECU/PPU
The ECU/PPU rubber
mounts wear out and let
the unit sag. If it sags too
much, the unit is hit and
damaged by the fender
when the Avenger rotates.
Sagging also lets it
bounce around and pull
out its inserts.
Normally, you should meas-
ure the ECU/PPU for sagging
every month. But soldiers oper-
ating in Iraq say the extreme
heat there wears out the mounts
faster so you may need to meas-
ure every other week. Check the
distance from the bottom of the
ECU/PPU to the fender on both
sides. If the difference is more
than an inch, report it. The
mounts are sagging.
Keep Track of the HOURS Meter
The ECU/PPU is supposed to be
serviced by direct support every
250 hours of operation. If you for-
get, the life of the ECU/PPU will
be greatly shortened. So when the
HOURS meter says 250, schedule
a visit for your Avenger to DS.
New mounts
come with
NSN 5342-01-
140-4201.
Check HOUR meter to see when next service is due
Check oil daily in field
Measure distance from
ECU/PPU to fender
If fuel hose is rubbing heat shield…
…shorten hose one inch
it’s cooler
outside
than inside
you! how can
I operate
like that?
how do
you expect
me
to
operate
when you
ignore my
ecu/ppu!?
Check mounts
for sagging
Avenger
Missile
System…
632.10-11(C!)
6/1/05
9:30 AM
Page 1
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