Beechcraft C23 SUNDOWNER 180 Pilot Operating Handbook page 259

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BEECHCRAFT
Section X
Safety
Information
"Severe".
The National Weather Service definition
of
"severe
icing" describes
that condition as: "the
rate
of accumulation
is
such
that deicing/anti-icing
equipment fails to
reduce
or control the hazard."
No
airplane
equipped
with
any
combination
of
deicing/anti-icing
equipment can be expected to cope
with
such
conditiohs.
As
competent
pilots
know,
there
appear
to be no
predictable
limits for the
severest
weather
conditions.
For
essentially
the
same
reasons
that
airplanes,
however
designed or
equipped
for IFR flight, cannot be flown safely into
conditions
such
as
thunderstorms,
tornados,
hurricanes
or other
phenomena
likely to
produce
severe
turbulence,
airplanes
equipped
for flight in
icing conditions
cannot be
expected
to cope
with
"severe"
icing conditions as defined by the National
Weather
Service.
The
prudent
pilot
must
remain
alert
to the
possiblity
that icing conditions
may
become "severe",
and
that his equipment
will
not
cope
with
them.
At
the first indication
that
such
condition
may
have been
encountered
or may lie
ahead,
he should immediately
react
by
selecting
the
most
expeditious
and
safe course
for diversion.
Every
pilot
of a
properly
and fully-equipped
Beech
airplane
who
ventures
into icing conditions
must
maintain the minimum speed (KIAS) for operation in
icing conditions,
which
is
set
forth in the Normal
Procedures
Section of his
Information
Manual.
If a
March, 1981
10-29

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