Raytheon Beech Baron E55 - Anti-Icing Systems

(i3~echcraft
BARON
55
AND
58
SHOP
MANUAL
b.
The
18-ohm 50-watt
resistor attached
to
the
\age,
where it
connects
to the
discharge
tube that
runs
inboard side
of
the
rib
at
wing
station 45.0.
along
the
lower
edge
of
the
pilot’s
windshield.
The
c.
The
landing
gear
safety
switch
relay
located
for-
discharge
tube has
five
orifices
equally
spaced
for
ward
of
the
main
spar
carry-through.
effective diffusion
of
the
anti-icing
fluid.
d. The
landing
gear
safety
switch.
The
propeller anti-icing
system
is controlled
by
a
cir-
cuit breaker
switch
on
the left
subpanel.
The
amount
e.
The
5-amp
stall
warning
circuit
breaker.
of
anti-icing
fluid
available
in
the
supply
tank
is
indi-
cated
by
a
gage
on
the
upper
right
corner
of
the
HEAT TEST FOR
HIGH
HEAT STALL
instrument
panel.
The
propeller anti-icing
system
must
WARNING
SWITCH,
(OPTIONAL
ON
be turned
on
to
supply
power
to
the
anti-icing
pump
TH-
1377
AND
AFTER)
before
the’windshield
anti-icing
system
can
be
used.
The
windshield
anti-icing
system
is
controlled
by
a
For
this
test
an
accurate
ohmmeter
(Fluhe
8100A
or
three-position
switch mounted
on
the
left
subpanel.
equivalent)
is
required.
The
windshield anti-icer
may
be
operated
either
con-
a.
Remove
the
switch
from the
left
wing.
tinuously
(when
the
switch
is
in
the
ON
position)
or
b. Disconnect
the red
or
white
and
purple
wires
from
"Ome"tairly (whiie
the switch
is held
in
the
MOM. ON
the
airplane wiring,
position).
When
the control switch is
actuated,
power
is
supplied
to
open
the solenoid valve that
regulates
c.
Connect the ohmmeter
to
the
red
or
white
and
the
flow of
anti-icing
fluid
to
the
discharge
tube
at
the
purple
wires.
pilot’s
windshield.
To
ensure
proper
operation
of the
d.
The
ohmmeter
should indicate
4.8
to
6.7
ohms.
anti-icing
system,
observe
the
following
maintenance
e.
If
the
indication
is
correct,
remove
the
wires
and
P’ecautions:
reinstall
the
switch, a.
Since
the
orifices
in
the
discharge
tube
are
small
f.
If the
indication
is
incorrect,
replace
the
switch.
(.0130/.0225
inch
in
diameter
for
the
propeller
and
.0210
inch
in
diameter
for
the
windshield)
and
easily
I
ANTI-ICING
SYSTEMS
plugged,
the
system
should
be
periodically
checked
to
ensure
that
proper
fluid
flow
is
maintained. The
pro-
(Figure
11-23)
peiler
anti-icing
system
should
be
checked
to
ensure
that
2.25
to
2.75
quarts
per
hour
per
propeller
is main-
PROPELLER
AND
WINDSHIELD
tained.
ANTI-ICING
MAINTENANCE
b. To
prevent
the orifices
in
the
discharge
tubes
from
The
isopropyl
alcohol
used
by
the
propeller
and wind-
becoming
clogged
or
restricted,
periodically
clean the
shield
anti-icing
system
is
supplied
by
a
three-gallon
screen
located
at the
bottom
of
the
anti-icing
pump
tank
located
beneath
the
floor
on
the
left side of
the
and
service
the tank
only
with
clean
isopropyl
alcohol.
nose
baggage
compartment.
The
filler
cap
to
the
tank
c.
Drain and flush the
supply
tank twice
a
year.
is
accessible
through
a
door
in
the
nose
compartment
d.
Check
the clearance
of
the
discharge
tube
to
the
floor.
The
supply
line from
the
tank is
routed
directly
anti-icer
boot
with the
propeller
blade rotated
to
the
aft
to
the
pump
that
provides
the
pressure
to
operate
low
pitch
stop.
Adjust
the
discharge
tube centerline to
the
anti-icing
system.
The outflow
line
from
the
pump
discharge
the
anti-icing
fluid
onto
the
anti-icer
boot
at
is
routed
aft under the floor
and
outboard
along
the
the
foreward
groove
of the boot with the tube
clearing
wing
leading edge
to
the
right
side
of
each
nacelle,
the
boot
by
.06
.03
inch.
then
forward
to
the
slinger
rings
on
each
propeller.
The
flow
of
anti-icing
fluid
to
the
propeller
is controlled
ANTI-ICE
FLUID INDICATOR
by
two
orifices located
at
the
ends
of
the
discharge
CALIBRATION
tubes
at
the
propeller
slinger
rings.
On
airplanes
equipped
with
the
optional
windshield
anti-icing
sys-
a.
Fill
the
alcohol
anti-ice tank
with
clean
isopropyl
alcohol.
tem,
another
line from
the
anti-icing
pump
tees
off
to
the
solenoid
valve that
regulates
the flow
of
anti-icing
b´•
Remove
the
cover
from the
junction
box mounted
fluid
to
the
windshield
anti-icing
discharge
tube. This
on
the
upper
LH
side
of the forward closure.
valve
is
mounted
just
outboard
of
the
pump
and
the
c.
Locate the
potentiometer adjustment
screw on
the
line
from
the
valve
is
routed
to
the center
of
the
fuse-
aft
printed
circuit board
in
the
junction
box.
Turn the
815
11-41