Raytheon Beech Baron E55 - Page 537

~eechcraft
BARON
55
AND
58
SHOP
MANUAL
ELECTRIC PROPELLER
DEICER
NOTE
MODULAR BRUSH REPLACEMENT
During
measurement
only
1/16
inch
of
(GOODRICH)
(TE-
1182
AND
AF~ER,
brush should
protrude
from
the
brush
TH-1231 THRU TH-1396 EXCEPT
module,
this
being
the
normal
protrusion
when the brush
is
installed
on
the air-
TH-1389, TC-2419,
TC-2450
AND
AFTER)
plane.
The
modular brush
assembly
is made
up
of
two
mod-
Brush
wear
is determined
by
inserting
a
pin
into
a
hole
uies. Each module consists of
a
plastic housing
with
in
the back
of the
brush module
as
shown.
Refer
to
an
integral
brush
and
spring.
The modular units
are
Figure
11-29.
On
all rodless
brushes,
the brush
mod-
stacked with
a
spacer
and
are
held
together
with
ule
must
be
replaced
when
the
dimension
shown
is
screws.
When
a
brush
wears
out,
the entire module
1~7/6411/32
inches.
Refer
to
Figure
11-29.
must
be
replaced.
A brush
module
is
considered to
be
Disconnect the wire
harness
terminals
at
the
ter-
worn
out
when
only
3/8
inch of
material remains.
minal
screws
of
the modular
units
that
make
up
the
brush
assembly.
the modular units
to
the
mounting
bracket.Remove
the
screws,
nuts,
and washers
securing
When
replacing propeller
deicer
c.
Remove
the
assembly
retaining
screws
and
sepa-
brushes,
all
attaching
hardware
must
be
rate
the modules and
spacer.
torqued
to
no more
than
18
inch-pounds
d.
Replace
each module
with another
of the
same
in
order
to
avoid
damaging
the brush
part
number. The
part
number
is
etched
into the
sur-
modules.
face of the
plastichousing.
e.
Restack
the modules
and
spacer.
f.
Install
the
assembly
screws so
that
the
screw
head
fits in the
recess
in
the
spacer.
Place
the
flat
washer
between
the
star
washer
and modular
housing
and
install the
retaining
nut. Make
sure
the
assembly
is
"square"
before
tightening
the
assembly
screws
in
place.
g.
Place
the
modular
units
on
the
mounting
screws
through
the
modules and bracket.
One
washer
fits
under the head
of
the
screw
and
one
under the
retain-
ing
nut.
h.
Before
installing
the
retainer
nuts,
make
sure
that
the brushes
are
aligned
with
the
slip
rings
such that
the entire brush face
contacts
the
copper
rings,
if
the
MAX.
1
7/
brushes
do
not
align
with
the
slip rings
throughout
the
entire
360
degrees
of
slip ring
rotation,
install shims
(P/N
1
El
1
57)
between the brush
module
spacer
and
the
mounting
bracket until the
brushes
are
properly
90-251-27
aligned
with the
approximate
center
of the
copper
ring.
NOTE
During
the
measurement
only
i.
Install
the
retaining
washers
and
nuts,
making
cer-
1/16 inch of
brush should
be al-
tain
that
1/32
to
3/32
inch
is
maintained between
the
lowed
to
protrude
from
the
brush
module.
brush modules and the
slip ring
surface. To
prevent
damage
to
the
brushes,
the
brush
modules
should
be
angled
so
that the brushes
contact
the
slip
rings
at
an
angle
of
approximately
two
degrees
from
perpendicu-
I
lar,
as
measured
toward the
direction
of
slip
ring
rota-
Figure
11-29.
Brush
Wear
On
Modular Brush
tion,
as
shown.
Refer
to
Figure
11-30.
515
11-57