Raytheon Beech Baron E55 - Page 546

BARON
55
AND
58
SHOP
MANUAL
ground
from
pin
B of
the
timer.
The voltmeter should hands to check
for the
proper
heating
sequence
of the
indicate
approximately
24
volts
when
the
airplane
bat-
propeller
deicer.
If
any
irregularities
are
detected,
a
tery
supply
is
being
used.
Next,
check
the
DC
voltage
continuity
check should be
performed
on
the
wiring
to
ground
from
pins
D,
and
F,
the
points
at
which the from the timer
to
the brush block holder
and
the
pro-
system
voltage
is
impressed
in
sequence
to
cycle peller
deicer terminal connection.
power
to
the deicers.
The
plugs
should read
24
volts
for
90
seconds
each,
then
repeat.
CAUTION
Timing
Time
ON
Prop
Deicer
While
following
the
instructions of
the
Sequence
Heated
"HEAT
TES~’
section,
move
the
propel-
Pin
D 90
sec.
Right
Engine
ler
back and forth
to
prevent
arcing
Prop
between
the
brushes
and
slip ring.
Pin
F 90
Sec.
Left
Engine
Prop
NOTE
I
wuhllm
I
WARNING
The
timer
does
not
reposition
itself,
but
will
begin
its
cycling
at
the
same
position
Before
moving
the
propeller,
make
in which it
was
last
turned off.
certain
that
the
Ignition
switch
is
off
and
that the
engine
has cooled
com-
If
the
engines
are
not
operating
the
volt-
pletely.
There
Is
always
some
danger
age
may
become low
enough
to
cause
of
a
cylinder
flring-
when
the
propeller
improper
cycling
of the
timer.
Do
not
Is
moved.
allow
the
voltage
to
drop
below
22
volts.
After
a
voltage reading
of 24
volts
DC
is
obtained,
hold the
voltmeter
probe
on
the
pin
until the
voltage
BRUSH WEAR LIMITS
(MCCAULEY3
I
drops
to
zero
before
moving
the
probe
on
to
the
next
(Figures
11-37)
pin
in
sequence
noted
earlier.
After the
correctness
of
The brushes
may
be checked
for
wear
by
one
of the
the
cycling
sequence
has
been
established,
turn
the
following
methods.
deicing
system
switch
OFF
at
the
beginning
of
one
of
the
"on-time"
periods
and
record
the letter
of
the
pin
at
ON THE
AIRPLANE
which the
voltage supply
is
present
to
facilitate
perfor-
mance
of the
following
test,
a.
Insert
a
thin,
stiff
feeler
gage
into the slot
on
the
side
of the
brush
block.
HEAT
TEST
(MCCAULEY)
b.
If
the
gage goes
past
the back of the
brushes
the
brushes need
replaced.
Before this
test
can
be
performed,
the
jumper
wire
install for the timer
test
must
be removed
so
that
the
REMOVED
FROM
THE
AIRPLANE.
connector
plug
can
be
replaced
in
the timer
recep-
tacle. Two
men are
required
to
perform
this
test,
one
a.
Insert
a
thin,
stiff feeler
gage
into the slot
on
the
in the
cockpit
to
monitor the
ammeter
while
the
other
side
of the
brush block
past
the back
of
the brushes.
checks
the
deicer boots.
The
man
in the
cockpit
turns
b.
Gently
push
the brushes
into the
brush
block.
the
deicer
switch
ON while
the
man
outside feels
the
c.
If
any
brush has
.094
inch
of brush
or
less
remain-
boots to
see
if
they
are
heating
properly.
The
man
in
ing
outside
the brush
block,
that
brush
assembly
the cabin
observes
the
ammeter
for
the
proper
read-
needs
to
be
replaced.
ing (14
to
18
amperes)
throughout
the
timing
sequence.
The
ammeter
needle
should
deflect
every
BRUSH REPLACEMENT
(MCCAULEY;I
I
90
seconds
in
response
to
the
switching
action
of
the
(Figure
11-37)
timer.
Each
time
this
occurs,
the
man
in the
cockpit
must
notify
the
man
inspecting
the
propeller
deicer
a.
Remove
the brush block from the
engine
as
indi-
boots
so
that
the latter
can
change
the
position
of his
cated in BRUSH BLOCK REMOVAL.
11-66
E15