Raytheon Beech Baron E55 - Page 574

Raytheon
Aircraft
Company
BARON
55
AND
58
SHOP MANUAL
PAINTING
ALUMINUM
PREPARATION
OF AIRPLANE ALUMINUM EXTERIOR
FOR
PAINT
a.
Mask
windows
with
a
double
thickness of
paper.
Cover all
openings
where
paint
might
enter
the
airplane.
b.
With
sandpaper
or a
nylon
pad,
roughen
the entire
surface
to
be
painted
and smooth
scratches
and
rough
areas
to
ensure
a
satisfactory
paint
finish.
c.
Clean
airplane
surface
to
be
painted
with
solvent
(lacquer
thinner
or
methyl propyl
ketone)
to
remove
shop
primer,
exposed
sealer,
silicone
deposits,
and other contaminants
which could
adversely
affect the
paint
finish.
d.
Wipe
the
cleaned
surface
with
a
tacky
rag
to
remove
dust.
Do
not
touch the surface
to
be
painted
with
your
hands
or
contact
the
surface with
your
clothing.
APPLICATION
OF
EXTERIOR PAINT
ON
ALUMINUM SKINS
a.
Apply
one
light
wet coat
of
pretreatment
wash
primer
(item
23,
Consumable
Materials
Chart,
Section
2).
Mix
the
wash
primer
to
the
manufacturer’s directions.
Keep
air
pressure
at
a
minimum
during
application
of
the
primer
to
prevent
overspray.
NOTE:
Temperature
and
humidity
will
affect
drying
time
of
the
wash
primer.
It should
dry
in
at
least
one
hour,
but
not
over
six
hours,
before
the
zinc
chromate
primer
is
applied.
b.
Proceed
to
prime
with
a
wet
coat
of MIL-P-8585
zinc chromate
primer
(Item
24,
Consumable Materials
Chart,
Section
2),
thinned
one
part
primer
and
two
parts
toluol
(Item
20,
Consumable
Materials
Chart,
Section
2).
A
heavy
hiding
coat
of
this
primer
is
not
desired
and will
impair performance.
c.
With fine
grit
sandpaper
(400
to
600),
very
lightly
sand
the zinc chromate
primer
surface
and
remove
the
sanding
dust with
a
tacky
rag.
d.
The
exterior
surfaces
are
now
ready
for
the color
coat.
Cross-coat
the
color
application
until
complete
coverage
is
obtained.
EXTERIOR
PAINT
TOUCH-UP REPAIR
a.
Mask
around
the
skin
containing
the
damaged
area.
b.
Remove
any
loose
edges
of
paint by
using
a
high
tack
adhesive
tape
around the
edge
of
the
damage
area.
c.
Using
a
coarse
sandpaper,
fair the
edge
of
the
damaged
area
with
the
metal.
d.
When
the
edge
of
the
paint begins
to
feather
into
a
smooth
joint,
use a
fine
grade
of
sandpaper
to
eliminate the
sand
scratches
left
by
the
coarse
paper
so
that the finish will be
perfectly
smooth.
Take
care
to avoid
removing
any
more
metal
than is
absolutely
necessary.
e.
Wash the
sanded
area
with
a
solvent,
such
as
solvent,
(Item
18,
Consumable
Materials
Chart,
Section
2),
or
I
solvent,
(Item
20,
Consumable
Materials
Chart,
Section
2).
Change
the wash
cloths
used
for this
purpose
frequently
so
that all
the
sanding
dust
will be
picked
up.
f.
After the
area
to be
touched
up
has been cleaned with
solvent
until all
trace
of
discoloration is
gone,
apply
a
coat
of
pretreatment
primer
to
the
damaged
area.
E21
SECTION
12
Dec
31/03Page
5