Cessna 172N - Page 31

CESSNA
MODEL
172N
SECTION
3
EMERGENCY PROCEDURES
WARNING
After
discharging
an extinguisher
within
a
closed cabin,
ventilate
the cabin.
(4)
Land the
airplane
as
soon
as
possible
to inspect
for damage.
WING FIR,E
Navigation
Light
Switch
--
OFF.
Pitot Heat
Switch
(if
installed)
--
OFF.
Strobe
Light Switch
(if
installed)
--
OFF.
NOTE
Perform a
sideslip
to keep
the flames away from the
fuel tank and
cabin, and
land as soon
as
possible
using
flaps
only
as required for final
approach
and touchdown.
ICIN
G
INADVER,TENT
ICING
ENCOUNTER
(1)
Turn
pitot
heat
switch ON
(if
installed).
(2)
Turn
back
or
change altitude
to obtain an
outside air temperature
that is less condtrcive to icing.
(3)
PuIl
cabin
heat
control full
out and open defroster outlet
to obtain
murimum windshield defroster airflovv.
Adjust
cabin air control to
get
ma><imum
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 ma:ri-
mum 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
l/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 biuild-up
on
the
horizontal
tail,
the change in wing wake
airflow direction caused by
wing
flap
extension corld
result
in
a
loss
of elevator effectiveness.
(1)
(2)
(3)
3-7