PS Magazine - TB 43-PS-683
PS, The Preventative Maintenance Monthly
ISSUE 683
OCTOBER 2009
37
PS 683
OCT 09
After flight operations, the
pilots center the cockpit controls
during shutdown. If you change
the position of these controls
during maintenance, the rotor
blades
and
rotor
head
pitch
varying housings are adjusted to
a pitched angle position.
When mechanics rotate the
angled rotors during maintenance,
damage could result. The aft
rotor can smash into the anti-
collision
light.
The
forward
rotor can smash into the forward
maintenance platform latches if
they are left open.
Keeping the screen clean
is especially important when
switching the vent valve from
the closed to the open position.
In a hot, dusty environment
when
the
vent
valve
stays
closed, gunk can accumulate on
the screen. Cleaning the screen
when opening the vent valve
and keeping it clean while open
ensures the pressure in the rotor
dampeners stays equalized.
Save yourself the agony of unnecessary light repair and latch damage or maybe
even rotor replacement. Check the clearance of the forward and aft rotors whenever
the flight controls are moved from the centered position during maintenance. Center
the flight controls again before you exit the aircraft.
Keep Flight Controls Centered
whenever your
chinook’s cockpit
flight controls
are in the centered
position, the rotor
blades and heads
can’t hit your bird’s
anti-collision lights
or latches. That
prevents damage to
the blades, rotor
head and Other parts
of the aircraft.
ok, let’s
go topside
and get the
job done.
I’m with
you on
that!
before you fellas do
anything, see if my flight
controls are centered.
Flight controls centered?
Not enough clearance for forward rotor…
…or aft rotor?
Center flight
controls
Screen must be clean when
vent valve is open or closed
CH-47D/F…
A good practice is
to always check the
filter screens prior to
setting the vent valve
to the open position.
if cleaning is
required, clean the
screen like it says
in the IETM for
your particular
model Chinook.
Also
check this
filter
often when
operating
below 0°F
with the
vents in
the open
position.
683.36-37.indd
1-2
8/22/09
3:43:35 PM
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