1.
The
Limitations
Section
of
the aircraft's Aircraft Flight Manual
(AFM)
by
incorporating the following:
"WARNING"
Severe icing
may
resu.lt
from
environmental
conditions outSide
of
those
for
which
the aircraft is certificated.
Flight in freezing rain, freezing drizzle, or mixed icing conditions (super
cooled liquid water
and
ice crystals)
may
result in:
• ice build-up on protected surfaces and exceed the capability
of
the
ice protection system, or
• ice forming aft
of
the protected surfaces.
This ice may not be shed using the ice protection systems, and
my
seriously degrade the performance and controllability
of
the aircraft.
During flight, severe icing
~onditions
that exceed those for which the
aircraft is certificated shall be detennined
by
the visual cues described
below.
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. The cues are:
• unusually extensive ice accumulation
on
the airframe and windscreen
in areas
not
normally observed
to
collect ice, and/or
• accumulation
of
ice on the lower surface
of
the wing aft
of
the
protected area, and/or
• accumulation
of
ice on the engine nacelles and propeller spinners
farther aft than normally observed.
Since the auto-pilot, when installed and operating, may mask tactile cues
that indicate adverse changes in handling characteristics, use
of
the auto-
pilot is prohibited when any
of
the visual cues specified above exist, or
when unusual lateral trim requirements or auto-pilot trim warnings are
encounter
d while the aIrcraft
l~
lil
iCiIl&
conditions,
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to
flight into
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direction
su
r e es
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nt·Li6t
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page 2-19
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