Cessna 402B 1973 - Page 82

Normol Operofion
To operate
the
windshield
deice system,
proceed
as follows;
(1)
Windshield Deice Switch Breaker
- ON.
NOTE
Allow
approrimately
l/8
to
l/4
inch
of ice to accu-
mulate.
The
windshield deice
system
can
be
used
as
an anti-ice
system
by
continuous
use.
However,
the ma;rimum
endurance with a 3-gallon talk
is
ap-
pro<imately
1.0
hour of
continuous
operation.
Air-
speed should
be
160
MPH IAS or below for
best re-
suIts.
Windshield
-
CHECK
(allow
approximately
10 seconds for alcohol
flow
to
begin).
When
windshield ice is
removed,
windshield
deice
switch
breaker
- OFF.
WARNING
The
windshield
deice
switch breaker must be
posi-
tioned OFF
20 seconds
prior
to
reaching minimum
descent altitude. The alcohol
film must be allowed
to
evaporate
before
a clear
field
of vision
through
the
windshield is available.
Emergency
Operolio
n
Abnorma"I operation of
the
alcohol windshield
deice
system is indicated
by the
switch
breaker tripping
to
the
OFF
posltion
or failure
of
alcohol to
flow onto
the
windshield.
Do not
leave
svstem on
more
than 3 mlnutes
without
alcohol flow.
PROPELTER DEICE
SYSTEM
?he
propeller
deice system
consists of
electrically heated
boots
on
the
propeller
blades.
Each boot consists of two
heating elements
"Outboard"
and
rT.nboard",
which
receive
their
electrical
power
through
a deice timer.
To reduce
power
drain
and maintain
propeller
balance,
the
timer
directs
current
to the
propeller
boots
in
cycles
between
elements and between
propellers.
(2)
(3)
'I
-C