Piper Cherokee Six - Page 143

PIPER
CHEROKEE
SIX
SERVICE
MANUAL
4-30.
CONTROL
SURFACE
BALANCING.
4-31.
CHECKING
CONTROL
SURFACE
BALANCE.
The movable
control
surfaces
have
been statically
balanced
at
the time of
installation
at the
factory
and normally
should
not
require
rebalancing.
Where
possible
the
control
surfaces
were
set with
the balance
weight
on
the heavy
side
of the limits,
to
permit
limited
repair or
paint
touch-up
without
adjusting
the
balance
weight.
It should
be noted
however,
that
spare control
surfaces
are
delivered
unpainted
and
the static
balance
will not
necessarily
fall within
the limits
provided,
this is more
pronounced
on the
stabilators
and rudders.
The
completed
control
surface
including
paint
should
be within
the
limits
given
in Table
IV-II.
If
the surface
is
not to
be painted,
the
balance
weight
will probably
require
adjustment.
All
replacement
control
surfaces
or surfaces
that
have
been
repainted
or
repaired
should
be
rebalanced
according
to
the procedures
given
in
paragraphs
4-33 thru
4-35.
The
static
balance
of the
surfaces
must
be as
specified
in
Table
IV-
II.
Before
balancing
any control
surface, it
must be complete
including
tip, trim/servo
tabs
as applicable
and tab
actuating arms
or push
rods with
bearings as
applicable, and
all
optional
equipment which
is mounted
on or
in the control
surface
when it is
flown,
including paint,
position lights
and wiring,
static wicks,
scuff boots, etc.
If optional
equipment
is added or
removed after
balancing
the control
surface must
be
rebalanced.
During
balancing,
trim/servo
tabs must be
maintained
in their neutral
positions.
4-32.
CHECKING
CONTROL
SURFACES
FREE
PLAY.
The following
checks
are
recommended
before
balancing
to ascertain
the
amount
of
"free play"
in
the stabilator,
stabilator
trim tab
and
aileron:
a.
Stabilator:
Check
the
stabilator
for
any "free
play"
at
its attachment
points
by
grasping
each half
near
the tip
and gently
trying
to move
it up
and down,
fore
and aft,
and
in and
out. No play
is allowed.
b. Stabilator
Trim
Tab: Set
the
stabilator
trim
tab in
neutral
position.
This
neutral
position
is
determined
with
the
airplane
properly
rigged
per instructions
given
in
Section
V
of this
Service
Manual
and the
trim
indicator
at
its neutral
position.
Obtain
a straightedge
long
enough
to
extend
from
the ground
up to
a few
inches
above
the trim
tab
trailing
edge.
Place
the straightedge
next
to
the
trim
tab inboard
(center)
trailing
edge;
secure
the
stabilator
in
neutral
and grasping
the tab,
gently
move
it
up and
down,
mark
the limit
of
tab
free
play
on the
straightedge.
The
overall
travel
(free
play)
must
not
exceed
0.15
of an
inch.
The
use
of a dial
indicator
and fixed
stand
is
recommended.
c.
Aileron:
Set the
aileron in
its neutral
position
and secure.
Obtain
a straightedge
long
enough
to
extend
from
the ground
up
to a few
inches
above
the aileron
trailing
edge.
Place
the
straightedge
next to
the
aileron
trailing
edge
and
gently
move
the aileron
up
and down,
mark
the
limit of
travel
(free play)
on
the straightedge.
The overall
travel
(free
play)
must
not
exceed
0.24
of an inch.
Should
free
play exceed
the
limit
stated make
necessary
repairs
as required
to eliminate
excessive
free play.
Grasp
the
aileron
and move
it
spanwise
(inboard/Outboard)
to insure
maximum
end play
of .035.
is not exceeded.
STRUCTURE
Revised:
12/4/79
IF23