Cessna 162 SKYLANE, Pilot'S Operating Handbook And Flight Training Supplement

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SECTION 6 CESSNA
EMERGENCY PROCEDURES MODEL 162
GARMIN G300
U.S.
ROUGH ENGINE OPERATION OR LOSS OF POWER
CARBURETOR ICING
A gradual loss of RPM and eventual engine roughness may result from
the formation of carburetor ice. To clear the ice, apply full throttle and
pull the CARB HEAT control knob full out until the engine runs
smoothly; then reduce carburetor heat and readjust throttle as
necessary. Monitor the G300 CARB °F indicator to verify the carburetor
temperature rises out of the amber caution range. 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 lean the
mixture for smoothest engine operation. The G300 CARB °F indicator
provides advisory information but does not replace the need to monitor
engine condition and adjust carburetor heat or mixture as needed for
safe engine performance.
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 MAGNETOS switch momentarily from BOTH to either L
or R position. An obvious power loss in single magneto operation is
evidence of spark plug or magneto trouble. Leaning the mixture to the
recommended lean setting for cruising flight may resolve a spark plug
fouling issue. If the problem does not clear up in several minutes,
determine if a richer mixture setting will produce smoother operation. If
not, proceed to the nearest airport for repairs using the BOTH position
of the MAGNETOS switch unless extreme roughness makes the use of
a single MAGNETO position necessary.
MAGNETO MALFUNCTION
Sudden engine roughness or misfiring is usually a sign of a magneto
problem. Changing the MAGNETOS switch from BOTH to the L and R
switch positions will identify which magneto is malfunctioning. Select
different power settings and enrichen the mixture to determine if
continued operation on BOTH magnetos is possible. If not, change to
the good magneto and continue to the nearest airport for repairs.
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