Raytheon Beech Baron E55 - Page 143

RBYtheoll
Aircraft
Company
BARON
55
AND 58
SHOP
MANUAL
ICE
REMOVAL
Moderate
or
heavy
ice and
residual
snow
deposits
should
be
removed
using
heated
water
or
deicing
fluid.
No
attempt
should be
made
to
remove
ice
deposits
or
break an
ice
bond
by
force.
If
heated
water
is
used
to
remove
ice
and
snow
deposits,
allow
adequate
time for
water to
drain
from
the
airplane
or
dry
the
airplane
with
a
soft
cloth
before
exposing
the
airplane
to
subfreezing
temperatures
in order
to
prevent refreezing.
After
completing
the
deicing
process,
the
airplane
should
be
inspected
to
ensure
that
its
condition
is
satisfactory
for
flight.
All
external
surfaces
should
be
examined
for
residual
ice,
snow,
or
frost.
Particular attention
should
be
paid
to
control
surfaces
gaps
and
hinges.
Carefully
inspect
static
ports
and
vents
for
any
signs
of
obstruction.
Control
surfaces
should be
moved
to
ascertain
they
have full and
free
movement.
Landing
gear
mechanism,
doors,
wheel
wells,
uplocks
and
microswitches
should
be
checked
for
ice
deposits
that
may
impair
function.
When
the
airplane
is
hangared
to
melt
ice,
any
melted ice
may
freeze
again
if the
airplane
is
subsequently
moved
into
freezing temperatures.
Any
measures
taken to
remove
frozen
deposits
while the
airplane
is
on
the
ground
must
also
prevent
the
possible
refreezing
of the
liquid.
Should
freezing
precipitation
continue
following
ice
removal,
treat
the
airplane
surfaces
for
anti-icing.
WARNING:
If
icing
exists
on
the
airplane
after
surface
treatment
for
anti-icing, complete
deicing
and the
sur-
face treatment
for
anti-icing
must
be
completed
prior
to
flight.
SAE
TYPE
I ANTI-ICING
FLUIDS
(UNTHICKENED-TYPE
FLUIDS)
SAE
Type
I fluids
mainly
provide
protection
against
refreezing
when
there is
no
precipitation.
All
approved
Type
I
fluids
may
be
used
for
either
deicing
or
anti-icing
at
any
dilution
as
allowed
by
the
fluid
manufacturer’s
recommendations.
DEICING
Deicing
is
a
procedure
by
which
frost,
ice
or
snow
are
removed
from
the
airplane.
To
preserve
holdover
time,
the
process
should be
continuous
and
as
brief
as
possible.
In
active
precipitation,
deicing
should
be
performed
at
the
last
practicable
moment.
The
deicing
agent
should be
applied
in
a
heated
state
to
assure
maximum
efficiency.
ONE STEP
DEICING
One
step
deicing
is
done with
a
heated mixture
of
anti-icing
fluid/water
formulated
to
provide
a
freezing point
buffer
at
least
10"
C
below
the ambient
temperature.
TWO-STEP
DEICINC
The
first
step
of
deicing
is
done
with
hot
water
or
a
hot
mixture of
anti-icing
fluid/water
formulated to
provide
a
fluid
freezing
point
of
no
more
than
7xC
above
ambient
temperature.
This
is followed
by
the
second
step
of
anti-icing:
an
overspray
with
a
mixture
of
anti-icing
fluid/water
or
of
100%
anti-icing
fluid formulated
to
provide
a
fluid
freezing point
of
at
least
10xC below
ambient
temperature.
The
second
step
MUST
BE
performed
within
three
minutes
of the
beginning
of
step
1
and,
if
necessary,
area-by-area.
ANTI-ICING
Anti-icing
is
a
precautionary
measure
which
prevents
frost,
ice
or
snow
from
forming
or
accumulating
on
the
protected
surface
of the
airplane.
CAUTION:
If
an
additional
treatment
after
deicing/anti-icing
is
required
before the
next
flight,
anti-icing
alone
is
not
recommended.
ALWAYS
PERFORM
A
COMPLETE
DEICING.
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