Thru - Raytheon BEECH BARON 58P Maintenance Manual

BEECHCRAFT
BARON 58P AND BARON 58TC
MAINTENANCE MANUAL
be crossed
to
assure proper
deicer opera-
tion. ~O
NOTE
~O
Secure brushes in the brush holder
to
prevent
breakage during
assem-
l\i
bly and
installation. (See Figure
207.)
h.
Check the
amount
of brush
1-s/lsl
protrusion
from the block. If the brushes MAX
1
protrude than
7/16
inch, the brush
leads should be untwisted
to
give
more
length.
If this distance is morethan 9/16
; I s eP25l . ~ e
inch,
the leads should be twisted
to
shorten
the
effective length until the
brushes protrude from
7/16to 9/16
inch.
Determining Deicer
Brush
Wear
The brushes should then be checked for Figure 205
free sliding action.
(See Figure 207.)
turned
on.
This
does
not
apply
to
ground
i. Place the brush block assembly checks of the
system
performed while the
on
the mounting bracket and
insert
the
engine is
not
running.
mounting
screws
through both the block and
bracket.
(See Figure 207.)
BRUSH REPLACEMENT
(TK-139
THRU
TK-150
EXCEPT
TK-147,
TJ-349
THRU
j.
Before installing the
retainer
TJ-443
EXCEPT
TJ-436)
nuts,
make
sure
that the brushes
are
aligned with the slip rings such that the The modular brush assembly
(P/N 3E2071)
entire brush face
contacts
the
copper
is made
up
of
two
modules
(P/N 3E2011-1
rings.
If the brushes do
not
align with
and
P/N 3E2011-2),
each consisting
of
a
the slip rings throughout the
entire
360 plastic housing
with
an
integral brush and
degrees
of slip ring. rotation, install
spring.
These modular units
are
stacked
shims
(P/N
1
E1157)
between the brush with
a
spacer and
held together by
screws
holder and the
mount
until the brushes
are
to
produce
the modular brush assembly.
properly aligned with the
approximate
When
a
brush
wears
out,
the module
con-
center
of the
copper
ring.
(See Figure
taining it
must
be replaced
since
indi-
207.)
vidual brush replacements
are
not
available. Replace the
entire
brush module
k. Install the retaining washers and when only
3/8
inch of brush material
nuts,
making certain that
1/16 +1/32
inch remains.
is
maintained between the brush block and
slip ring
surface. To
prevent
damage
to
NOTE
the brushes, the brush block assembly
should be angled in such
a manner
that the
During
measurement,
only
1/16
brushes
contact
the
slip ring
at
an
angle inch of brush should protrude from
of approximately
two
degrees
from perpen-
the brush module, with this being
dicular,
as
measured toward the
direction the
no rma
1
protrusion
when the
of slip ring rotation.
(See Figure 208.)
brush is installed
on
the air-
plane.
i. Connect and
safety
the
cannon
plug. Brush
wear
is
determined
by inserting
a
pin into
a
hole
in the back of the
brush
m.
To preclude arcing
caused by the
module
as
shown
in
Figure 205. On all
rough surfaces of the
new
brushes, the modules
havinis9hould
be replaced when
t h et h e
brushes
with
rods,
eng~ne
should be
operated for
at
least brush module
five hours before the
deicer
system
is dimension
shown in
Figure 205
is
17/32
30-60-00
Page
208
May
22/87
A22