Raytheon Beech Baron E55 - Electric Propeller Deicer System

Raytheon
Airtraft
Company
BARON
55
AND
58
SHOP
MANUAL
ELECTRIC
PROPELLER DEICER
SYSTEM
50-HOUR
INSPECTION
GUIDE
(GOODRICH
AND
MCCAULEY)
The
various
components
of
the
deicer
system
should
be
inspected periodically
for
incipient
defects.
The
purpose
of
the
following inspection
is
to
provide
a
means
for
detecting
and
correcting
such defects
before
they
render
the
system
inoperative.
a.
Lock the brakes
and
operate
the
engines
at
near
take-off
power.
Turn
the
deicer
system
switch
ON
and
observe
the
ammeter
for
at
least
2
minutes
(3
minutes
on
McCauley).
If
the
ammeter
needle does
not rest
within
the
shaded
band,
except
for
a
flicker
at
30 second
(90
seconds
on
McCauley)
intervals
when
the
step
switch
of
tt~e
timer
cycles,
refer to
the
troubleshooting
chart
for
the
probable
source
of trouble.
WARNING:
Before
moving
the
propeller,
make
certain
that
the
ignition
switch
Is
off
and
that the
engine
has
cooled
completely.
There
is
always
some
danger
of
a
cylinder firing
when
a
propeller
is
moved.
CAUTION:
While
following
the
instructions
of
Step
b.,
move
the
propeller
back and
forth
to
prevent
arcing
between
I
the brushes
and
the
slip ring.
b.
With
the
engine
shut-off,
turn
the
deicer switch
ON
and feel the
deicer
boots
on
the
propeller
for the
proper
sequence
of
heater
operation.
The
presence
of
local hot
spots
indicate
severe
damage
to
the
deicer
heaters,
which
should be
repaired
before
more
serious
damage
develops.
c.
Remove
the
spinner
dome and
open
all
access
doors
pertaining
to
the
wiring
and
components
of
the
detcer
system.
Turn the
deicer switch
ON
and station
an
assistant in the
airplane
to
observe
the
ammeter.
Flex
all
accessible
wiring,
particularly
the lead
straps,
leads
from the
slip
ring
assembly,
andthe fire wall
electricai
connectors
and their
wiring. Any
movement
of
the
ammeter,
other than
the
cycling
flicker
that
occurs
at
30
second
(90
seconds
on
McCauley)
intervals,
indicates
a
short
or
open
circuit
that
must
be
located
and
corrected.
d. To extend the
life of
the
lead
strap
between
the
hub
clamp
and
clip,
reposition
the bend
in
the
strap
at
a
point
at
least 1/2
inch
from the
existing
location
of
the bend.
e.
Check
for
damaged
brush
rods
or
springs
and
for
worn or
damaged
brushes.
ELECTRIC PROPELLER DEICER SYSTEM
1001HOUR
INSPECTION
GUIDE
(GOODRICH
AND
MCCAULEY)
a.
Repeatthe
50-hourinspection.
b.
Check
for
radio
noise
or
radio
compass
interference
by operating
the
engine
at
near
take-off
power
with
the
radio
gear
turned
on.
If,
under these conditions noise
or
interference
occurs
when
the deicer
switch
is
ON and
disappears
when
the switch is
OFF,
refer
to
the
troubleshooting
chart
for
the
probable
source
of trouble.
c.
Check
all
clamps, clips, mountings,
electrical
connections,
and
connectors
for
tightness
and
electrical
soundness. Also
check
for
loose,
broken
or
missing safety
wire.
d.
Closely
check
the deicer
boots
for
wrinkled,
loose
or
torn
areas,
particularly
around
the
outboard
end and
at
the
point
where
the
strap
passes
under
the hub
clamp.
Look for
abrasions
or
cuts
along
the
leading edge
of
the flat
or
thrust
face.
If
the
heater wires
are
exposed
in
damaged
areas
or
if
the rubber
is
found
to
be
tacky,
swollen,
or
deteriorated
las
from
contact
with
oil
or
solvent
fluids),
replace
the
damaged
deicer
boot.
E23
SECTION
16
17