Raytheon Beech Baron E55 - Page 277

Raytheon
Aircraft
BEECH
BARON
55
AND
58
SHOP
MANUAL
RUDDER
BALANCING
THE RUDDER
FIGURE
4-27
I
WARNING
I
WARNING
Due
to
rudder
imbalance
the
airplane
must not
be
flown with
the
rotating
beacon
light
removed
from
the
rudder.
When
the
rudder surface is
being repainted,
suspend
it
by
the
trailing edge
so
that
excess
paint
will
drain toward
the
leading
edge.
After
any
modifications,
repairs
or
repainting,
the
finished
surface
must
be check
balanced to
ensure
that
its
static
moment
about
the
hinge
line is
within
the manufacturer’s
prescribed
limits. The
complete
rudder
as-
sembly,
painted
or
unpainted including
the
control
arm
and
with
or
without
the bellcrank
attached,
on
serials
TO-1
and
after,
shall
not
be
tail-heavy
over a
maximum
of
15.0
inch-pounds.
On
serials TE-1
and
after
and
TH-1
and
after,
the
complete
painted
rudder
assembly,
with
or
without the
bellcrank
attached,
shall
not
be
tail-heavy
over
a
maxi-
mum
of
4.5
inch-pounds.
The
static
moment
of
the rudder
is
determined
by multiplying
the unbalanced
weight
of
the
rudder
assembly
times the
perpendicular
distance
from the
hinge
center
line
to
the
center
of
gravity
when
the
chord
line is
horizontally
level.
The
weight
is
measured in
pounds
and the distance
in
inches.
The static
moment
of
a
100
percent
balanced
rudder
assembly
is
0.0
inch-pounds.
Tail heaviness indicates
static underbalance
while
nose
heaviness
indicates
static
overbalance.
CHECKING
BALANCE
The
rudder
balance
must
be
checked
in
a
draft free
area
with the
rudder
completely
assembled
in
flying
condition.
All
painting,
including
stripes
and
touch-up,
must
be
completed.
The
tab,
tab
push
rod,
static
wicks,
and
hinge
bolts
must be
attached. The
chord
line
must
be
horizontally
level
and the
hinge
line
must
be
properly
supported
when the
static
moment
is
measured.
Although
many
different methods of
check
balancing
exist,
they
can
be
categorized
un-
der the
following
two
headings:
a.
Counterbalancing
The
application
of
a
known
force
or
weight
at
a
measured distance
from
the
hinge
line
to
counter
the
unbalance
moment
of
the rudder
assembly.
b.
Actual
Force
Measurement
A
measurement
of
the
force
applied
by
the rudder surface
on
a
single
support
at
a
known
distance
from the
center
line
of the
hinge.
FORCE
MEASUREMENT METHOD
I
CHECK
BALANCE
BY
FORCE MEASUREMENT
The
equipment
required
to
perform
the
check
balance
by
force
measurement
is
as
follows:
a.
A
stand
with
knife
edge
supports
as
illustrated
in
Figure
4-27.
The knife
edges
should be
in the
same
horizontal
plane.
b.
A
certified
beam
balance
calibrated in
units
of
0.01
Ibs.
or
less. The
balance
should have
a
flat
weighing
platform
and
its
capacity
should
equal
tare
plus
2.0
Ibs.
minimum.
c.
A
support
spindle
similar
to
the
illustration
and
leveling
blocks,
as
required. (Blocks
spindle
tare).
d.
A
straightedge,
rule
and
spirit
level.
E16
4-69