PS Magazine - TB 43-PS-612
PS, The Preventative Maintenance Monthly
ISSUE 612
NOVEMBER 2003
PS 612
NOV 03
39
W
ho you gonna call when your Apache main transmission oil filler cup drain hole
plugs up? Clog Busters!
Mechanics, you’re the drain clog busters to eyeball the bird’s oil filler cup drain
hole when you perform your 10-hour/14-day inspection like it says in TM 1-1520-
238-PMS.
So don’t forget to make sure excess oil, fluid, bugs, dirt, and condensation runoff
haven’t clogged the hole and backed up in the cup. Just because the oil drain hole is
out of sight, don’t put it out of mind.
If the drain hole gets clogged with
gunk and overflows the cup, it can
spill over on a hot generator. You
could end up with a fire or lots of
smoke and without generator power.
To unclog the oil drain hole, use a
6-ft long, 1/16-in diameter wire.
Attach a “Remove Before Flight”
streamer, NSN 8345-00-673-9992,
and swedge, NSN 4030-00-960-
1654. Smooth out all the burrs with
a piece of crocus cloth and lightly
coat the wire tip with RTV and let
dry. Snake the oil drain hole with the
wire to push the crud out. When the
drain is clear, remove the wire to
prevent a FOD problem.
PS 612
NOV 03
38
AH-64A/D…
W
hen a situation rubs you the wrong way, you take action.
Armament crews, when your Apache’s 30mm gun’s braided hydraulic lines and
hoses rub the wrong way against each other or against the wire strike, take action to
prevent chafing.
During your Before Flight PMCS, in Paragraph 4-5-1 of TM 9-1090-208-23-1-1,
make sure the gun’s hydraulic hoses are installed correctly and are not touching or
resting on the wire strike.
If the hoses rest on the wire strike during gun firing, aircraft vibration and gun
recoil will chafe and wear through the pressure and return hoses. That will cause
hydraulic leaks. The gun will lose elevation control and the ability to fire. Then the
gun is NMC.
When the hoses are installed correctly (the plane of the hose bends 90° to the
plane of the actuator), touching should not be a problem.
As an added measure, tie the lines together—but not too tight—with tie wraps,
NSN 5975-00-985-6630, to protect them from chafing.
looks
like your
hydraulic
hoses are
ok.
are they
routed away
from my gun
wire strike?
hey! I’m
smokin’
over
here!!!
looks
like we’ve
got an oil
filler cup
drain hole
clog!
cool your
engines! clog
busters are
here to take
care of you.
Use wire to keep
drain hole unclogged
Hoses should not rest on gun wire strike
Hose plane
90° from
actuator
plane?
Hose is
installed
correctly
90
°
Tie wrap
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