SectlonX
BEECHCRAFT
Safety Information
setting with altitude. {Refer to pre-landing check
list.)
VORnCES - WAKE TURBULENCE
Every airplane generates wakes
of
turbulence while
in
flight. Part of this is f rom the propefler or jet
engine, and
.part from the wing tip vortices. The
!arger and heavier the airplane, the more pronounced
and
turbulent the wakes
will
be. Wing tip vortices
from !arge, heavy airplanes are very severe
at
dose
range, degenerating with time, wind, and space.
These are rolling
in
nature, from each wing tip. In
tests,
vortex
velocities
of
133
knots have been
recorded.
Encountering the rolling
eff
ect of wing tip vortices
within two minutes after passage
of
!arge airplanes
is
most hazardous to light airplanes. This roll eff ect
can exceed the
maximum counter roll obtainable
in
a
light airplane.
The turbulent areas may remain
for as long as three
minutes or more, depending on wind conditions, and
may extend several miles beyond
the airplane. Plan
to fly
slightly above and to the windward side of the
other airplanes.
Becau_se
of the wide
variety
of
conditions that can be encountered, there
is
no set
rule to follow to avoid wake
turbulence
in all
10-56
March, 1981
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