Raytheon Beech Baron E55 - Page 278

Ray~heon
Aircraft
BEECH
BARON
55
AND
58
SHOP
MANUAL
BALANCING
PROCEDURE
FORCE
MEASUREMENT
METHOD
a.
Locate
the
chord
line
by
placing
a
straightedge
at
the lower
end
of
the
rudder
so
that
one
end
is
aligned
with
the
center
of
the
torque
tube
and
the
other
end is
centered
on
the
trailing
edge.
b.
Mark
the chord line
by
grease
pencil
or
other
means
on
the
rib.
Remove
the
straightedge.
c.
Fit
correct
size
bolts
in the
upper
and
center
hinge
brackets
and
mount
the
rudder
on
the
knife
edges.
Ensure
that
it is
free
to rotate
about the
hinge
line.
d.
Support
the
trailing
edge
behind
the
center
hinge point
with
a
spindle
resting
on
a
leveled
beam
balance
platform
as
illustrated.
The
spindle
must
be
vertical
throughout
the
balancing
procedure.
e.
Hold
a
spirit
level
against
the
marked
chord
line and level it
by
extending
or
contracting
the
spindle,
or
by
using
blocks and shims under the
spindle.
f.
Measure
the
perpendicular
distance
from
the
hinge
centerline
to
the
point
supported by
the
spindle.
g.
Ensure that the
spirit
level
and
rule
are
removed
from the
surface
and
read
the
reaction
on
the
beam
balance.
h. Calculate the static
underbalance
moment
M
from
the
formula:
M D
(R-T) inch-pounds
where,
D
Perpendicular
distance
from
the
hinge
center
line
to
the
spindle
point
(inches).
R
Reaction
(pounds)
read
from
the beam balance.
T
Tare;
i.e.
spindle
plus
leveling
blocks
or
shims
on
the scale
platform
(pounds).
EXAMPLE
D
is
13.8
inches,
R 1.87
Ib. and
T
is
1.00
Ib.
M
13.8
(1.87
-1.00);
M
12.0
inch-pounds
M
is
within
the
range
which
is
satisfactory.
If
M is
not
within the
prescribed
range,
refer to
step
i. under
BALANCING
PROCEDURE
COUNTERBALANCING
METHOD.
COUNTERBALANCING METHOD
CHECK BALANCE BY COUNTERBALANCING
I
The
equipment required
to
perform
the
check
balance
by
counterbalancing
is
as
follows:
a.
A
stand with
knife-edge
supports
as
illustrated
in
Figure
4-27.
The
knife-edges
must
be in the
same
horizontal
plane.
b. A
paper
cup
or
similar
light
weight
container.
c.
Approximately
2
pounds
of
lead
shot.
d. A
certified
beam
balance
weighing
device
calibrated in
units
of
0.01
pound
or
less.
e.
A
straightedge,
ruler,
and
spirit
level.
4-70
E16