2-14-3
Severe Icing Conditions
Severe icing may result from environmental conditions outside of those for which the airplane
is certificated. Flight in freezing rain, freezing drizzle, or mixed icing conditions (supercooled
liquid water and ice crystals) may result in ice build-up on protected surfaces exceeding the
capability of the ice protection system, or may result in ice forming aft of the protected
surfaces. This ice may not be shed using the ice protection systems, and may seriously
degrade the performance and controllability of the airplane.
During flight, severe icing conditions that exceed those for which the airplane is certificated
shall be determined by the following visual cues. If one or more of these visual cues exists,
immediately request priority handling from Air Traffic Control to facilitate a route or an altitude
change to exit the icing conditions:
−
Unusually extensive ice accumulation on the airframe and windshield areas not normally
observed to collect ice
−
Acumulation of ice beyond the active portions of the wing pneumatic boots.
Care must be taken when using the autopilot that tactile cues, such as increased aileron
forces, are not masked by the autopilot function. Periodically disengage the autopilot to check
for abnormal forces.
Section 2 - Limitations (EASA Approved)
Severe Icing Conditions
Pilot's Operating Handbook
Report No: 02406
Issue date: Mar 06, 2020
Page 2-14-2
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