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FLIGHT IN ICING CONDITIONS.
Although flying
in known icing
conditions
is prohibited,
an
unexpected
icing
encounter
should be
handled
as follows:
(1)
Turn
pitot
heat
switch
"ON"
(if installed).
(2)
Turn
back or
change
altitude
to
obtain
an
outside
air
temperature
that
is
less
conducive
to
icing.
(3)
Pull
cabin
heat
control
full
out
to
obtain
windshield
defroster
air-
flow.
Adjust
cabin
air control
to
get maximum
defroster
heat
and
airflow.
(4) Open
the throttle to
increase
engine speed and
determine
if ice
is soft enough
to
be
thrown
off
the
propeller
blades.
(5) Watch for signs
of carburetor
air filter ice and
apply
carburetor
heat as required.
An
unexplained
loss
in engine
speed
could
be
caused
by carburetor
ice or
air
intake
filter
ice.
(6)
Plan
a
landing
at
the
nearest
airport.
With
an
extremely
rapid
ice
build-up,
select
a suitable
"off airport"
landing
site.
(7)
With an ice accumulation
of one inch
or more
on
the
wing leading
edges,
be prepared
for significantly
higher
stall
speed.
(8)
Leave
wing flaps
retracted.
With
a
severe
ice
build-up
on
the
horizontal
tail, the
change
in wing wake
ainlow
direction
caused
by
wing
flap extension
could result
in a loss
of elevator
effectiveness.
(9) Open
left window
and
scrape
ice from
a
portion
of
the
windshield
for
visibility
in
the
landing approach.
The metal
control
lock
shield
may be used
as a scraper.
(10)
Perform
a
landing
approach
using
a forward
slip,
if necessary,
for
improved
visibility.
(11) Approach
at 75
to
85 MPH, depending
upon
the
amount
of ice
ac-
cumulation.
(12)
Avoid
steep
turns
during
the
landing
approach.
(13)
Perform
a
landing
in level
attitude.
3-8
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