~ft
Twin Engine (Piston)
FLIGHT IN ICING CONDITIONS
Section X
Safety Information
Light
Severe
Moderate
Every pilot should be intimately acquainted with the FAA
Approved National Weather Service definitions for ice inten-
sity and accumulation which we have reprinted below:
Intensity
Ice Accumulation
Trace Ice becomes perceptible. Rate of
accumulation slightly greater than rate
of sublimation. It is not hazardous
even though deicing/anti-icing equip-
ment is not utilized, unless encoun-
tered for an extended period of time
(over 1 hour).
The rate of accumulation may create a
problem if flight is prolonged in this
environment (over 1 hour). Occasional
use of deicing/anti-icing equipment
removes/prevents accumulation.
It
does not present a problem if the
deicing/anti-icing equipment is used.
The rate of accumulation is such that
even short encounters become poten-
tially hazardous and use of deicing/
anti-icing equipment or diversion is
necessary.
The rate of accumulation is such that
deicing/anti-icing equipment fails to
reduce or control the hazard. Immedi-
ate diversion is necessary.
It is no longer unusual to find deicing and anti-icing equip-
ment on a wide range of airplane sizes and types. Since the
capability of this equipment varies, it becomes the pilot's pri-
mary responsibility to understand limitations which restrict
the use of his airplane in icing conditions and the conditions
which may exceed the systems capacity.
May, 1994
10..31
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