Raytheon Beech Baron E55 - Page 892

Raynheon
Aircraft
Company
BARON
55
AND
58
SHOP MANUAL
e.
Check
that
the hub
clamps
are
tight. Inspect
for
cracks
or
other
damage.
Check
to
see
that the
cushioning
material
is
not
missing
or
damaged
in the
area
under
the hub
clamp
or on
the
edge
of
the
spinner
dome.
Manually operate
the
propeller
from
full
pitch
to
feathering
while
checking
that
the deicer
lead
straps
do
not
come
under tension.
f.
Check
the
slip rings
for
gouges,
roughened
surface, cracks,
burned
or
discolored
areas,
and for
deposits
of
oil,
grease,
or
dirt.
Clean
greasy
or
contaminated
slip
rings
with
solvent
(methyl
propyl
ketone
on
McCauley
or
solvent
53,
Consumable
Materials
Chart).
After
such
a
cleaning,
a
run-in time of
5
hours of
engine
operation
must
be
allowed
before
the
deicer
system
is turned
on.
g.
If
uneven
wear or
wobble is
detected,
check
the
alignment
of
the
slip rings
on
the
prop
shaft with
a
dial indicator.
While
checking
the
alignment,
push
in
while
turning
the
prop
to
eliminate
play
in the
propeller
thrust
bearing.
If
the
run-out
over
360
degrees
of
rotation is
over
0.005 inch
or
in
excess
of 0.002 inch
in
any
4-inch
are,
refer
to
the
paragraph
on
slip ring alignment
in
Section
11.
h.
Examine the brush
mounting
brackets
and
housings
for
cracks,
deformation
or
other
indications of
damage.
Check for
tight
connections
and that the leads
are
not
chafed
or
binding.
i.
Check
that
each
brush rides
fully
on
its
slip
ring
over
360
degrees
of
rotation.
If
the
brush is
not
properly aligned,
add
or remove
shims
under
the
brush block
or
elongate
the holes
in
the
mounting
bracket
to
raise
or
lower the
brush block
to
the
proper
position.
If the brushes ride both
high
and
low
with
respect
to
the
slip
rings
in
360
degrees
of
rotation,
the
slip ring assembly
is
eccentrically
mounted
and
must
be
replaced.
j.
Check
for
proper
spacing
between
the brush block and
slip
rings
as
indicated
in
Figure
11-25,
11-30
or
11-36
in
Section
11.
If this distance is
not
within the
specified
limits,
loosen the
mounting
screws
and
reposition
them
in
the
elongated
holes until
the
block
is
properly positioned.
If
necessary,
shims
can
be added between
the
th
rust
bearing
plate
and the
mounting
bracket until the brush block is
properly
located.
k.
Estimate the
contact
angle
of the brush block
in
relation
to
the
slip rings.
If
this
angle
is
not
approximately
2
degrees, ton
McCauley
they
are
to
be
parallel)
as
indicated in
Figure
11-25
or
11-30
in Section
11,
loosen
the
mounting
bolts and
reposition
the´•brush block
until
the
proper
angle
exist
between the
brush block and
slip rings.
It
should
be
noted that the
spacing
established
in
Step
j.
must
also be maintained
after
the
proper
angle
is
established.
WARNING: Before
moving
the
propeller,
make certain that the
ignition
switch is off and that
the
engine
has
cooled
completely.
There is
always
some
danger
of
a
cylinder
firing
when
a
propeller
is
moved.
CAUTION:
While
following
the
instructions
of
Step
i.,
move
the
propeller
back
and
forth
to
prevent
arcing
between
the
brushes
and
slip ring.
i.
With
the
deicer
system
operating
and
a
man
in
the
airplane
observe the
ammeter,
visually inspect
and
physically
flex the
wiring
from
the
brush block
to
each
component
of
the
deicer
system
and
the
airplane
power
supply.
Jumps
of
the
ammeter
needle,
other
than
the
momentary
flicker that
occurs
when the timer switches
at
30-
or
90-
(McCauley
only)
second
intervals,
indicates loose
or
broken
wiring
in
the
area
under
examination
at
the
moment.
In such
instances,
continue to
flex
the
wiring
in
the
area
that first indicated trouble while
checking
the
continuity through
the individual
wires of
the
affected
harness until the
source
of
trouble is located.
Use
the
wiring
diagram
to
trace
the circuit
of
the deicer
system.
page
IIDec
31/04
SECTION
16
E23