Raytheon Beech Baron E55 - Page 144

Raytheon
AiKraft
Company
BARON
55
AND
58
SHOP
MANUAL
HOLDOVER
TIME
Holdover
time
is the
estimated duration
of the time that
anti-icing
fluid
will
prevent
frost,
ice
or
snow
from
forming
or
accumulating
on
the
protected
surfaces
of
an
airplane
under
average
weather conditions. Holdover
time
tables
shall
only
be
used
as
part
of
an
approved ground-deicing
program.
PRECAUTIONS
All
reasonable
precautions
must
be taken
to
minimize
the
entry
of fluid into
engines,
intakes
and control
surface
cavities.
a.
Deicing/anti-icing
must not
be
directed
into
the
orifices
of
pitot
heads
or
static
vents;
these fluids must
not
be
applied
directly
onto
airstream-direction
detectors,
probes,
angle-of-attack
airflow
sensors,
or
on
windows.
b.
The
engines
must
be shut
down
during deicing/anti-icing.
c.
Both left
hand
and
right
hand
wings
must
receive the
same
complete
treatment.
d.
Any
traces
of
deicing/anti-icing
fluid
on
cockpit
windows
must
be
removed
prior
to
departure.
Pay
particular
attention
to
windows
fitted
with
wipers.
In
addition,
any
forward
area
from
which
the
fluid
may
flow
back
onto
windscreens
during
taxi
and
takeoff
must
be cleaned
prior
to
departure.
e.
After
prolonged
periods
of
deicinglanti-icing,
it is
advisable
to
check for residues
of
thickened
deicing/anti-icing
fluids
aerodynamically quiet
areas
and cavities like balance
bays,
and
rear
spars
of
the
wing
and
stabilizersl
Fluids
may
accumulate,
dry,
and interfere with
proper
control
surface
movement
in
these
areas.
CHECKS
FOR
THE
NEED TO
DEICE
The
wings,
tail
section
and
fuselage
have
to
be checked
far
possible
ice,
snow
and
frost
accumulation.
If frost
or
ice
has formed
on
the
lower
surface
of
the
wing
in
the
fuel
tank
area
while
the
airplane
is
being
exposed
to
precipitation
train,
drizzle,
or
fog),
the
upper
surface
of
the
wing
must
be
carefully
examined
for
the
formation
of
clear
ice. In
conclusion,
it
should
be
noted
that
heavy
freezing
has
been
reported
as
forming
at
temperatures
up
to
59"
F
(15"
C) (caused
by
cold
fuel).
CA
UTION:
It
must
be remembered that clear icewhich is
very
difficult
to
defect
may
underlie
a
layer
of snow/slush.
FINAL
CHECKS
AFTER
AIRPLANE DEICING
Wing
and
stabilizers have
to
be
free
of
frost,
ice
and
snow as
well
as
water
accumulation.
During
snowfall
and
freezing
rain,
snow
and
melting
ice
could
penetrate
and refreeze
in
slots,
balance
bays, drainage openings,
hinges,
operating
linkages,
inlet
scoops,
ram
tubes and
landing
gear
components
such
as
landing
gear
struts,
latching
mechanisms
and
electrical
switching
elements.
Consequently,
these
areas
should
be
checked
after
the
airplane
has
been
parked
outside
for
a
long
period
of
time under
inclement
conditions.
CHECK
OF
COMPLETE
DEICING
If
ice is
found
on
the
wing
upper
surfaces,
check
the
entire
wing through
all
accessible
openings
to
ensure
all
deposits
of
ice
have been removed
after
deicing/anti-icing
have
been
applied.
NOTE:
In
some cases
the
presence
of ice
can
be determined
by
touch.
Fuselage
areas
in front
of
the
cockpit
windows
must
be
free
of
ice
and
snow.
This
is
also valid
for
all
air
inlet
and
outlet
openings
of
the
air-conditioning
as
well
as
their
adjacent
areas.
E23
SECTION
2
Dec
31/04Page
59