get maximum defroster heat
and
airflow.
(
4)
Open
the throttle
to
increase engine speed
and
minimize ice
build-up
on
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. Lean the mixture
for maximum
RPM
if carburetor heat
is
used continuously.
(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
1/4 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 airflow direction caused
by
wing
flap extension could result in a loss
of
elevator effectiveness.
(9)
Open
l
.
~~t
win
.d_
o.w
and, . .if
practic~,
.
scrape ice from a portion of
th~
windsh~eld
for· visibility. in the. landing approach.
(10)
Perform a landing
app~oach
·using a forward slip, if necessary,
for improve.d
vi~ibility.
, . . . , . - -·
(11)
Approach
at"75
to ·
a5
MPH,
depending
upon
the amount of ice
accumulation. ·
(12)
Perform a landing in level attitude.-
ROUGH
E~
_
~l~E
OPE
.RATION
OR
-.
LOSS
._
Of
. POWER.
•
••
• • 4
CARBUR-
ETOR
ICING.
A gradual loss
of
RPM
and
eventual engine roughness
may
result
from
the formation
of
_carburetor ice.-
To
· clear the ice, · apply full'ihrottle and
pull the carburetor
h~at
knob
full
out
until the engine runs smoothly; then
remove carburetor' heat
and
readjust the throttle.
If
conditions require
the continued use
of
carburetor heat in cruise flight, ·use the minimum
amount
of
heat_ necessary to prevent ice from forming
and
le~
the
m~re
slightly for smoothest engine operation. · ·
..
SPARK
PLUG FOULING.
. . .
A slight engine roughness in flight
may
be caused
by
one
or
· more
spark plugs becoming fouled
by
carbon
or
lead deposits. This may be
verified
by
turning the ignition switch momentarily from
BOTH
to either
Lor
R position.
An
obvious power loss in single ignition operation
is
evidence
of
spark plug
or
magneto trouble. Assuming that spark plugs
are the more likely cause, lean the-mixture to ·the normal
-lean
setting for
..
3-7
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