PS Magazine - TB 43-PS-637
PS, The Preventative Maintenance Monthly
ISSUE 637
DECEMBER 2005
PS 637
DEC 05
41
Mop Up Problems
During your daily inspections of the flight control closet, always wipe off
hydraulic fluid from all the components. It’s OK for the ILCA manifold to leak some
per task 7-7 of TM 55-1520-240-23-6. But if the manifold is not wiped off, hydraulic
fluid can build up and drip down on the DASH actuator. Fluid can get into the DASH
internal motors and burn
them out.
Check the cannon plugs
of the DASH and the con-
trol position transducers in
the closet for fluid runoff.
Wipe up excess hydraulic
fluid to avoid uncontrolled
lockups and advanced flight
control system faults.
To ensure uneventful
flights, and erratic pitch atti-
tude, check out TB 1-1520-
240-20-107 for the details.
CH-47D…
Button Pushing
The flight control closet is a tight area, but not doing the integrated lower control
actuator (ILCA) jam simulation test prior to the first flight of each day puts your bird
at risk. Get in there and get at it!
Test the red jam sensor indicator buttons and
make sure they pop out. Do it like it says in task
7-104.1 of TM 55-1520-240-23-6.
In operation, the red jam sensor indicator buttons
pop automatically when there’s a problem with the
ICLA. The jam simulator buttons are hard to get at.
The tool to use to press down on the plunger
should not be a screwdriver, hard metal or sharp
tool. They can cause the plunger and seals of the
jam simulation buttons to mushroom out of their
close tolerance, making them stick. If the ILCA
jam simulation buttons get damaged and can’t be
reset, AVIM has to replace the entire actuator
assembly.
So don’t use unauthorized tools. Instead, press
the buttons—all eight of them—with a tool made
of wood or a soft metal—like aluminum or brass—
that has a flattened surface on one end. If the red
buttons pop out, then you’re good to go and can
reset ‘em and forget ‘em until the next flight.
Wipe off excess fluid on DASH and
check connector for wetness inside
Look and feel for missing
hardware in closet
Test ILCA buttons everyday
Crew chiefs,
the ILCA
inspection is
required
prior
to
first flight,
but it’s often
forgotten.
637.40-41(C!).qxd
11/3/05
5:52 PM
Page 1
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