Raytheon Beech Baron E55 - Page 535

ci~eechcraft
BARON
55
AND
58
SHOP
MANUAL
j.
Place
the
brush block
assembly
on
the
mounting
ELECTRIC
PF~OPELLER
DNCER
TIMER
bracket and
insert the
mounting
screws
through
both
CHECK
(GOODRICH)
(TE-938,
TE-943
I
the
block
and bracket. Refer
to
Figure
11-27.
THRU
TE-1181,
TH-I
THRU
TH-1230,
k.
Before
installing
the
retainer
nuts,
make
sure
that
TC-1608
THRU
TC-2418,
TC-~420
THRU
the
brushes
are
aligned
with the
slip
rings
such that
TC-2449)
the
entire brush
face
contacts
the
copper
rings.
If
the
brushes
do
not
align
with
the
slip
rings
throughout
the
Experience
in
the
field has often indicated that the
entire
360
degrees
of
slip
ring
rotation,
install shims
timer is
considered
defective
when
the
source
of
the
(P/N
1
E
1157)
between
the
brush
holder and the
trouble
lies
elsewhere.
For this
reason,
the
following
mount
until the
brushes
are
properly
aligned
with the
test
should
be
performed
before
the
timer is removed
approximate
center
of the
copper
ring.
as
defective:
i.
Install
the
retaining
washers and
nuts,
making
cer-
a.
With
the
wiring
harness
disconnected
at
the timer
tain that
1/32
to
3/32
inch
is
maintained
between the
and
the deicer
switch
in
the
ON
position,
check
the
brush
block and
slip ring
surface.
To
prevent
damage
voltage
from
pin
B of the harness
plug
to
ground,
if
no
to
the
brushes,
the brush
block
assembly
should
be
voltage
is
present,
the
timer is
NOT
at
fault; however,
angled
in such
a manner
that the brushes
contact
the
if
system
voltage
is
present
at
pin
B,
check
the circuit
slip
ring
at
an
angle
of
approximately
two
degrees
from harness
plug
pin
G
to
ground
with
an
ohmmeter.
from
perpendicular,
as
measured
toward
the
direction
If
no
circuit
is
indicated,
the
fault
is
in the
ground
lead
I
of
slip
ring
rotation. Refer
to
Figure
11-25.
rather
than
the
timer.
If
the
ground
connection is
open,
m.
Connect
and
safety
wire the
cannon
plug,
the timer
step
switch
will
not
change
position.
n.
To
preclude
arcing
caused
by
the
rough
surfaces
b. After the
ground
and
power
circuits have been
of the
new
brushes,
the
engine
should
be
operated
for
checked,
connect-a
jumper
wire
between
pin
B
of the
at
least
five hours before
the deicer
system
is
turned
timer
receptacle
and terminal
B
of the
connector
plug
on.
This
does
not
apply
to
ground
checks
of
the
sys-
and from
pin
G
on
the timer
receptacle
to
ground.
With
tem
performed
while the
engine
is
not
running.
the
deicing
system
switch
ON,
check the
voltage
to
ground
from
pin
B of
the
timer.
The voltmeter should
REPLACEMENT
OF
BRUSH BLOCK
indicate
approximately
24 volts
when the
airplane
bat-
ASSEMBLY
WITH
MODULAR
BRUSH
tery
supply
is
being
used.
Next,
check
the
DC
voltage
BLOCK ASSEMBLY
(GOODRICH)
(TE-938,
to
ground
from
pins
C,
D,
E,
and
F,
the
points
at
which
the
system
voltage
is
impressed
in
sequence
to
cycle
TE-943
THRU
TE-1181,
TH-1
THRU
power
to
the
propeller
deicers.
Each
of the
plugs
TH-1230,
TC-1608
THRU
TC-2418
should read
24
volts in the
following
sequence:
TC-2420
THRU
TC-2449)
Modular
brush assemblies
were
developed
to
replace
Timing
Timer Areas of
Prop
brush
block assemblies.
Each
module
brush
assembly
Sequence
On
Deicer
Heated
is
made
up
of three
modules.
Each
module consists
of
Pin
30
Right
Engine
prop,
a
plastic
housing
with
an
integral
brush
and
spring.
C
sec.
outboard
halves
These
modular
units
are
stacked
with
the
appropriate
spacers
to
produce
the
assemblies.
Screws
are
used
Pin
30
Right
Engine
prop,
to
hold the
modules
and
spacers
together.
D
sec.
inboard
halves
Pin
30
Left
Engine
prop,
To
replace
brush
blocks
with modular
brush blocks
E
sec.
outboard
halves
contact
an
Authorized
BEECHCRAFT
Parts
Outlet
and
request
the
BEECHCRAFT
Kit
applicable
to
the
Pin 30
Left
Engine
prop,
specific
installation.
F
sec.
inboard halves
515
11-55