PS Magazine - TB 43-PS-673
PS, The Preventative Maintenance Monthly
ISSUE 673
DECEMBER 2008
40
PS 673
DEC 08
41
PS 673
DEC 08
M
echanics, you wouldn’t think an engine flush could cause problems, right? But if you
ignore any part of the flushing procedures spelled out in TM 1-1520-Longbow/Apache, you
can experience engine and/or other problems.
An engine flush is required every 125 hours. That’s good for the engine. But if you
forget to disconnect the integrated pressure air system (IPAS) high pressure line from the
engine before flushing, it could be a long day.
Forgetting to unhook the high pressure line could set up your IPAS system for trouble.
Engine flush cleaning solvent sent through the high pressure line will drain from the
engine and into the IPAS system. The engine cleaning solvent is corrosive and can cause
damage to the pressure regulator, pressure relief valve, and IPAS lines. Eventually, cleaning
solvent can work its way into the backside of the primary and utility manifolds. Then the
hydraulic system will be in harm’s way.
When the high pressure IPAS line
is disconnected from the engine, the
cleaning fluid is able to drain out of the
engine properly.
The notch is probably caused by wear from vibration and is usually the length of
the aft missile shoe. It’s possible the notch could cause a hangFre or loss of missile
control after launch.
So HellFre crews need to immediately check all their launcher rails for notching.
Check not only the aft missile shoes area, but the entire rail for notches. If you spot
any, replace the rail.
JAMS put out a safety of use message,
AMCOM-08-003, on the launcher notching.
Engine Flushing
and the IPAS
once you have
removed the high
pressure Ipas
line, FOLLOW
THE FLUShing
procedures
spelled out in TM
1-1520-Longbow/
Apache or
chapter
7
of tm
1-2840-248-23.
Disconnect IPAS line before flushing
it’s that
time
again!
yeah,
I could
use a good engine
flush just don’t
forget the Ipas!
AH-64D…
personnel with the
joint attack munition
systems (jams)
project manager’s
office have discovered
a number of hellfire
launcher rails in the
field with notches at
the aft shoe location.
if you find
notched rails or
have questions,
contact pm jams
war room at dsn
7
88-0295, (256)
842-0295,
or email:
mslsjamswarroom@
msl.army.mil
Hell±re Missile System…
Look for the Notch
Look for notch along rails
673.40-41.indd
1-2
10/27/08
5:27:54 PM
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