T B M
PILOT’S INFORMATION MANUAL 700
SECTION 2
LIMITATIONS
D.G.A.C. Approved
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Page 2.6.1A
Rev. 8
SEVERE ICING CONDITIONS
WARNING
SEVERE ICING MAY RESULT FROM ENVIRONMENTAL CONDITIONS
OUTSIDE OF THOSE FOR WHICH THE AIRCRAFT 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 AIRCRAFT
During flight, severe icing conditions that exceed those for which the aircraft
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 in
areas not normally observed to collect ice.
– Accumulation of ice on the upper surface of the wing aft of the protected
area.
Since the autopilot, when operating, may mask tactile cues that indicate
adverse changes in handling characteristics, use of the autopilot is prohibited
when any of the visual cues specified above exist, or when unusual lateral
trim requirements or autopilot trim warnings are encountered while the
aircraft is in icing conditions.
Refer to the list of ”Equipement required depending on type of operation” in
this same chapter.
In any case of icing conditions, first refer to particular procedures described in
Chapter 4.5 (normal procedures) and in case of unforeseen icing conditions,
refer in addition to the emergency procedure described in Chapter 3.13.
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