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SECTION
3
EMERGENCY
PROCEDURES
CESSNA
MODEL
172N
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
ll4
incn'
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 effective-
ness.
9.
Open
left window
and,
if practical,
scrape
ice
from
a
portion
of
the
windshield for
visibility
in the landing
approach.
10.
Perform
a
landing
approach
using
a
forward slip, if
necessary,
for
improved
visibility.
11.
Approach at 65 to 75
KIAS
depending upon the amount
of
the
accumulation.
12.
Perform
a
landing in level attitude.
STATIC SOURCE BLOCKAGE
(Erroneous
lnstrument
Reading Suspected)
1.
Alternate Static
Source
Valve -- PULL
ON.
2.
Airspeed -- Consult appropriate calibration tables
in
Section
5.
LANDING WITH
A
FLAT
MAIN
TIRE
1.
Approach -- NORMAL.
2.
Touchdown
-
-
GOOD
TIRE FIRST, hold
airplane
off
flat tire
as
long
as possible.
ELECTRICAL POWER SUPPLY SYSTEM
MALFUNCTIONS
AMMETER SHOWS EXCESSIVE RATE OF CHARGE
(Full Scale Deflection)
1.
Alternator --
OFF.
2.
Alternator Circuit
Breaker -- PULL.
3.
Nonessential Electrical Equipment --
OFF.
4.
Flight
-- TERMINATE
as soon as
practical.
1
July
1979
3-8
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