PS Magazine - TB 43-PS-688
PS, The Preventative Maintenance Monthly
ISSUE 688
MARCH 2010
36
PS 688
MAR 10
37
PS 688
MAR 10
M
echanics, manual operation of your Chinook’s winch using the winch control shutoff
valve and the winch control valve in the heater closet is for emergency use only. Always
pay attention when using these emergency controls. If you don’t, you’ll be doing major
sheet metal damage repair.
After emergency operations, make sure the
winch plunger on the winch control shutoff valve
is returned to the centered detent position to
disengage the winch. Always follow the winch
emergency operator instructions stenciled on the
panel above the control valve to avoid damage.
If you forget and leave the plunger pushed
in and the winch control valve knob positioned
either counterclockwise or clockwise, your bird
will suffer damage. That’s because the winch
up/down limit switches are bypassed when using
these emergency controls. The next time aircraft
hydraulic power is applied to the bird, the winch
will automatically engage.
For example, if the hook is on the
winch cable and the knob is turned
counterclockwise,
the
hydraulic
power will pull the hook into and
through the companionway floor like
scissors cutting paper! If the hook is
not installed, the cable is sucked into
the winch drum and lost.
When
using
winch
emergency
controls, eyeball all the instructions
on the panel and in TM 1-1520-240-
240-10.
TMs, vests, and survival gear that get tossed into the avionics
bay put the fuel probe at risk. The delicate fuel probe wiring in the
avionics compartment will give you a zero reading on the fuel indicator
if broken. A broken fuel probe deadlines your bird.
Careless tossing of equipment into the
bay can also damage other components
like COMSEC gear, SINCGARS radios,
UHF and VHF antenna communication
boxes and their cables.
Never use the avionics compartment
area as a storage bin. When the mission
is complete or the maintenance task is
done, return all equipment, tools, TMs,
and gear back in to where you signed
them out.
CH-47D/F…
OH-58D…
A Place for Storage
pilots and co-pilots,
your kiowa warrior has
limited
storage space.
the avionics compartment has
some space, but it should
not
be used for storage.
Equipment
stored near
fuel probe
causes
damage
Use winch
emergency
controls
properly
Hook
can rip
through
floor, if
winch
not used
properly
we have
to use
the winch
emergency
controls.
ok, but don’t
forget to put
the plunger
back to the
center detent
position.
let’s get
ready
for the
mission.
I’ll get
the gear.
don’t
even
think about
putting
your
gear
in my bay!
you could
cause
damage
to my fuel
probe!
688.36-37.indd
1-2
1/25/10
3:08:28 PM
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