Flight Training - November/December 2021 - 15

HOW IT WORKS
BY JILL W. TALLMAN
DEICING BOOTS
BUY SOME TIME
PILOTS ARE ROUTINELY ADMONISHED
not to fly into known icing conditions,
particularly with an airplane that is not
equipped to handle icing. That's because
if ice forms on an airplane's leading
edges, that formation will disrupt the
flow of air over an airfoil and-basic Bernoulli-create
drag while destroying lift.
What can happen next? A stall at a higher
airspeed and/or lower angle of attack,
possibly uncontrollable roll and pitch.
Some general aviation airplanes are
equipped with deicing systems to be used
in the event ice begins to form on the airplane
in flight. These systems do not give
pilots a green light to blast off into freezing
rain. Rather, they are meant to buy
some time to exit the icing conditions.
Deicing boots are designed to knock
off the ice as it begins to form over
leading edges. The boots-which are
not boot shaped, nor are they on the
wheel pants-are rubber strips attached
to the leading edges of the wings and
tail surfaces. Once activated, they are
pressurized with air and they expand to
break the ice off the boot surfaces. Then
suction is applied to the boots, and they
return to their original shape.
You might also spy boots on an
airplane's propeller. Rather than pneumatics,
these systems use heating wires,
or a layer of etched foil embedded inside
the boots and attached to the inner part
of the leading edge of each propeller
blade. The pilot activates a switch, and
the boots receive an electric current from
a slip ring and brush assembly to the
spinner. The electrical energy activates
the heating elements inside each boot,
and thus melts ice from the surface of the
propeller blades.
jill.tallman@aopa.org
Heating element
is attached to propeller
When boot inflates and
expands, ice breaks free
Electric current warms
heating element on
propeller boot
Boot or sleeve is installed
around leading edge
of wing and horizontal
stabilizer
FLIGHT TRAINING NOVEMBER/DECEMBER 2021
15
STEVE KARP

Flight Training - November/December 2021

Table of Contents for the Digital Edition of Flight Training - November/December 2021

Contents
Flight Training - November/December 2021 - Intro
Flight Training - November/December 2021 - Cover1
Flight Training - November/December 2021 - Cover2
Flight Training - November/December 2021 - Contents
Flight Training - November/December 2021 - 2
Flight Training - November/December 2021 - 3
Flight Training - November/December 2021 - 4
Flight Training - November/December 2021 - 5
Flight Training - November/December 2021 - 6
Flight Training - November/December 2021 - 7
Flight Training - November/December 2021 - 8
Flight Training - November/December 2021 - 9
Flight Training - November/December 2021 - 10
Flight Training - November/December 2021 - 11
Flight Training - November/December 2021 - 12
Flight Training - November/December 2021 - 13
Flight Training - November/December 2021 - 14
Flight Training - November/December 2021 - 15
Flight Training - November/December 2021 - 16
Flight Training - November/December 2021 - 17
Flight Training - November/December 2021 - 18
Flight Training - November/December 2021 - 19
Flight Training - November/December 2021 - 20
Flight Training - November/December 2021 - 21
Flight Training - November/December 2021 - 22
Flight Training - November/December 2021 - 23
Flight Training - November/December 2021 - 24
Flight Training - November/December 2021 - 25
Flight Training - November/December 2021 - 26
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Flight Training - November/December 2021 - 29
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Flight Training - November/December 2021 - 56
Flight Training - November/December 2021 - Cover3
Flight Training - November/December 2021 - Cover4
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