Raytheon Beech Baron E55 - Page 549

~S2)eechcraft
BARON
55
AND
58
SHOP
MANUAL
rings.
If the
run-out
over
160"of
rotation
is
.008
inch
or
g.
Deburr
the
slip
ring edges.
greater,
the
slip
rings
need
machining
or
replacement.
h~ Polish the
ringiaces
with
crocus
cloth to obtain
a
SLIP
RING
OR
BRUSH
BLOCK
CLEANING
finish
of
16
to
22
microinches.
(MCCAULEY)
i.
Check the
electrical resistance
between each
ring
The
slip
rings
and
brush
block
may
be
cleaned
with
a
and
the
holder,
and
between
each
ring.
The resis-
I
clean
cloth
dampened
with
methyl
ethyl
ketone
(19,
tance
should be
a
minimum
of 50K
ohms.
Consumable
Materials
Chart,
Section
2)
TROUBLESHOOTING
PROPELLER
SLIP
RING
MACHINING
(MCCAULEY)
ELECTRICAL
DEICER
SYSTEM
Structurally
sound
slip
rings
with
damaged
surfaces
may
be
machined
to
restore
them
to
serviceability.
(GOODRICH
AND
MCCAULEY)
a.
Clean
the
slip
ring
assembly
with
methyl
ethyl
The
ammeter
of
the
deicer
system
can
be
used
to
I
ketone
(19,
Consumable
Materials
Chart,
Section
2)
indicate
the
general
nature
of
most
electrical
prob-
lems.
Consequently,
it
is recommended
that,
to
deter-
b.
Check the
assembly
mounting
surface
flatness.
It
mine
which
circuits
are
involved,
trubleshooting
be
must
be
flat
within
.OOEiinch
overall.
preceded
by
the
ammeter
test
outlined
in
the
deicer
c.
Locate
the
assembly
concentrically
in
a
lathe
so
100-hour
inspection
(Section
16)
A
reading
of
hf~o-
that
there
is
no
more
than
.002
inch
of
wobble
or
run-
thirds
the
normal
amount
of
current
(or
one-half
on
out
over
360"
of
rotation.
The
assembly
should
be
two-blade
props)
is
an
indication that
one
of
the
cir-
fixed
in
the
lathe
in the
same
manner
as
it
was
CUitS is
Open
between
the
slip
ring
assembty
and the
attached to
the
propeller
assembly.
This
will
ensure
deicer
heater.
If
the
ammeter
registers
excess
current,
that
the
run-out
held
while
machining
the
assembly
the
power
lead
is shorted
to
ground.
It
is
possible
that
will be
transferred
when
it
is
mounted
on
the
propeller.
the
excess
current
has
welded the timer
contacts
in
one
phase.
Under these
circunstances,
the
timer
will
d. Take
a
light
cut
for
a
smooth
finish
(25
to
20
micro
either feed
current
to
the
welded
contacts
continui-
inches)
ously
or
not
cycle.
If
the
former
is
true,
the heat
test
NOTE
will
show
two
phases
heating
simultaneously.
The
spindle
speed
should
be 500
rpm
or
greater.
If
machining
vibration
is
noticed,
Unless
the
grounded
power
lead is
located
and
cor-
it
must
be
corrected.
Machine
vibration
rected,
any
new
timer that is
installed
may
suffer
the
which is
not
corrected
will
result
in
a
same
internal
damage
during
the
first
use
of
the
sys-
chattered
finish.
The
feed
rate
is
to
be
tem.
In
general,
for most
effective
use
of the
trouble-
.002
inch
or
less
with
a
final
pass
of .005
shooting
chart,
all
of
the
"indication"
entries should
be
inch
to
.010
inch.
read
to
locate
that
which matches
conditions
of
the
e.
Ensure
that the
face
surface
of the
slip
rings
are
particular
system
being
checked.
The
numbered
parallel
and
flat
within
.008
overall.
"probable
cause"
and
"remarks"
then
indicate the
proper
sequence
of
checks. It should
be
noted,
how-
f.
The
slip
ring
holder
face
and
the
insulation
around
and
between
the
slip
rings
must
be
undercut
to
.050
ever,
that
such
numbers
are
assigned
with
respect
to
inch
to
.060
inch.
the
approximate
usefulness
of
the check
rather than
to
the
most
likley
sequence
of
occurance.
The
test
unit
was
designed
to
be
used
in
conjunction
CAUTION
with these
troubleshooting
procedures
and
can
be
When
undercutting
the
isulation
between
built
with standard
parts
normally
found
in
the
shop.
the
slip
rings,
do
not cut
the
inside
diam-
Refer
to
Figure
1 1-39.
The
test
unit
makes it
possible
eter
or
the
outside
diameter
of
the
slip
to
positively
check the
timer
in
the
airplane
during
sys-
rings
by
more
than .003
inch
past
the
tem
operation.
original
diameter.
515
11-69