Raytheon Beech Baron E55 - Page 533

Ci~eechcraft
BARON
55
AND
58
SHOP
MANUAL
assemblies,
slip
rings,
an
ammeter,
timer
and
an
the
ammeter
on
the
LH
subpanel
will
register
a
on-off switch
on
th
LH
instrument
subpanel.
When
the
momentary
deflection.
switch
is
turned
on,
the
ammeter
on
the LH instrument
subpanel
registers
the
amount
of
current
(14
to
18
ELECTRIC PROPELLER
DE/CER
BRUSH
amperes)
passing
through
the
system.
If
the
current
REPLACEMENT
(GOODRICH)
(TE-938,
rises above
the
switch
limit,
an
integral
circuit breaker
TE-943
THRU
TE-1181,
TH-1 THRU
I
will
cut
off the
power
to
the
timer. The
current
flows
TH-1230,
TC-1608
THRU
TC-2418,
from
the timer in the
RH
wing
center
section
to
the
TC-2420 THRU
TC-2449)
brush
assembly
mounted
on
front of the
engine
case
and is
conducted
by
the brush
assembly
to
the
slip
a´•
Check brush
wear
by inserting
a
piece
of
safety
rings
installed
on
the
spinner
backing
plate.
The
slip
wire into
the holes above each
brush
assembly
block.
rings
distribute
current to
the
deicer
boot
on
the
pro-
If the wire
will
insert
more
than
17/32
inch
it
is
time
to
peller
blades.
Heat from
the boots reduces the
grip
of
replace
the
brushes.
Refer
to
Figure
11-26.
the
ice,
which
is
then
removed
by
the
centrifugal
effect
b~
Disconnect the
cannon
plug
and
remove
the
of
propeller
rotation
and the
blast of the
air
stream,
brush
assembly
from the
bracket. Refer
to
Figure
Power
to
the
two
heating
elements
on
each
blade
is
11_28.
cycled
by
the timer
to
the
outboard and inboard heat-
ing
elements
in
the
following
sequence;
RH
outboard,
NOTE
RH
inboard,
LH
outboard,
LH inboard.
Since each
of
Secure
brushes in
place
before
remov-
these
phases
is
30
seconds
in
duration,
the
timer
ing
the
brush
assembly
to
prevent
makes
a
complete
cycle
every
two minutes.
When-
breaking
reusable
brushes
during
and
ever
the
timer
switches
to
the
next
phase
of
operation,
after
removal.
Refer
to
Figure
11-27.
1
O
SLIP
RING
ASSY
1Ro´•r~norr
O
ROTATION
1/32
MIN.
2"
3/32
MAX.
!I
17/32"
MAX
THRUST
BEARING
I
LBRUSH
BLOCK
PLATE
ASSY
Figure
11-25.
Propeller
Deicer
Brush Block
Installation
Figure
11-26.
Determining
Delcer
Brush
Wear
515
11-53