Check boots
carefully
for
complete deflation
to
the vacuum hold
down
position.
NOTE
Complete
infl,ation
and deflation
cycle will
last ap-
proximately
30
seconds.
In
Flighr
(1)
When
ice
has
accumulated
to
appronimately
t/2
inch
thick
on
the
leading edges,
position
deice switch to
ACTUATE.
Af ter tonding
(1)
Check boots for damage
and
cleanliness. Remove
any accumu-
lation
of
engine oil
or
grease.
OPERATING DEIAILS
Cycling of
the deice
boots
produces
no
aerodynamic
effects in any
atti-
tude
within
the
allowable
flight
limitations.
Deice boots are intended
to
remove ice after it
has
accumulated rather than
preventing
its
accumu-
Iation. If
the
rate
of
ice accumulation is slow, best results can
be ob-
tained by
leaving
the
deice system
OFF
until 1/4
to
3/4 ineh of
ice has
accumulated. After
clearing this
accumulation with
one
or two
cycles
of
operation, the system should
remain
OFF
until a significant
quantity
of
ice
has
again
accumulated.
Rapid cycling
of
the
system is not recom-
mended,
as
this
may
cause
the
ice
to
grow
outside
the
contour of
the in-
flated
boots,
preventing
its
removal.
NOTE
Since
wing,
horizontal
stabilizer, and vertical sta-
blizer deice boots
alone
do
not
provide
adequate
protection
for the entire
aircraft, known
icing
con-
ditions
should be
avoided whenever
possible.
If
icing
is
encountered,
close
attention should
be
given
to the
pitot-static
system,
propellers,
in-
duction systems
and
other
components subject
to
icing'
The deice system will operate satisfactorily
on either
or both engines.
During
single-engine operation, suction to
the
gyros
will drop
momenta-
rily
during
boot infl,ation
cycle.
DEICE
BOOI
CARE
Deice boots have a special,
electrically-conductive
coating
to
bleed-
(2)
?-3
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