Supplement POH
Cessna 172 R&S
(FAA-Version)
Page 3-11
Issue 3
Revision 2, Mar. 2022
FLIGHT IN ICING CONDITIONS
In case of inadvertent icing encounter proceed as follows:
(1) Pitot Heat switch – ON (if installed)
(2) Turn back or change the altitude to obtain an outside air
temperature that is less conducive to icing.
(3) Pull the cabin heat control full out and open defroster
outlets to obtain maximum windshield defroster airflow.
Adjust cabin air control to get maximum defroster heat
and airflow.
(4) Advance the Thrust Lever to increase the propeller speed
and keep ice accumulation on the propeller blades as low
as possible.
(5) Watch for signs of air filter icing and pull the "Alternate Air
Door" control if necessary. An unexplaned loss in engine
power could be caused by ice blocking the air intake filter.
Opening the "Alternate Air Door" allows preheated air from
the engine compartment to be aspirated.
(6) Plan a landing at the nearest airfield. With an extremely
rapid ice build up, select a suitable "off airfield" landing site.
(7) With an ice accumulation of 0.5 cm or more on the wing
leading edges, a significantly higher stall speed should be
expected.
(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) Perform a landing approach using a forward slip, if
necessary, for improved visibility.
(10) Approach at 65 to 75 KIAS depending upon the amount of
the accumulation.
(11) Perform a landing in level attitude.
WARNING: It is prohibited to fly in known icing
conditions.
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