Cessna T188C - Page 400

MODEL
188 & T188
SERIES SERVICE
MANUAL
17-77. REPAIR OF HOPPER (See figure 17-13.) d. Prepare a sufficient number of glass-fiber cloths
to restore
original
thickness
of damaged
area.
Trim
17-78. The hopper is constructed of glass-fiber re- the first piece of cloth to fit two inches beyond the
Inforced
plastic. An extensively
damager
hopper, or
chamfered
area, then trim
each succeeding
piece
one which has
damage to stiffening
beads, fittings,
or slightly
smaller
than the preceding
one. Trim
the
metal components
embedded
in the plastic,
should
be
final inside
cloth (type
128 or
equivalent)
to overlap
replaced.
With these
exceptions,
cracked punctured,
the
other laminations
as illustrated.
or otherwise
damaged
areas may be
repaired. Any
e. Mix
the adhesive
according to directions
fur-
repairs
must
restore
at least
the original
strength
to
nished.
the repaired
area.
Although repairs
may be made
f. Coat
chamfered
area, and two
inches beyond
without removing
the hopper, it is generally more
chamfer, with the
adhesive. Place the first pre-
practicable
to remove it.
cut piece of cloth
in position on the coated area,
then
work additional
adhesive
into
the fabric
to
impreg-
WARNING
nate it completely.
g. Apply subsequent
patches,
each slightly
smaller
The hopper
must be
thoroughly
cleaned
of
than
the preceding
one,
using same
laminating
tech-
toxic
materials.
Extreme
care
must
be
nique,
until
original
thickness
has
been
restored.
used
to avoid
inhalation
or ingestion
of
Use sufficient
adhesive
to
assure a resin-rich
sur-
material removed
from the hopper lami-
face and to preclude
any wicking of the fabric.
nate.
h. Coat
prepared surface
on outside of
hopper with
the adhesive and
apply one layer
of cloth, using
same
NOTE
technique.
1.
Allow repair
to cure a minimum
of 12 hours
at
A laminating
kit (SK188-1),
a filler kit
70°F, or four
hours at 130F.
Proportionally
longer
(SK188-2),
and a sealer
kit
(SK188-3)
curing
time
is required
in cooler
temperature.
are available
from
the Cessna
Service
j. If the
surface of
the repaired
area
inside the
Parts
Center.
Two types
of glass-fiber
hopper
is rough
enough to
trap chemicals,
sand
cloth
are included
in the
laminating
kit.
smooth
and apply
additional
adhesive
to assure
a
Type
HG63
is a
coarser,
thicker
cloth
smooth
resin-rich
surface,
then
allow
to cure.
than
type
128.
Type
HG63
is used
for
all laminations
except the
final one,
for
17-79. REPAIR
OF
CATWALK.
(See figure
17-14.)
which type
128 is used.
The sealer
kit
is
the same adhesive
contained in
the
17-80.
The catwalk is
constructed of
glass-fiber re-
laminating
kit,
but
is packaged
separately.
inforced
plastic
skins,
bonded
to an
aluminum
honey-
comb
core. An adhesive-backed
wing walk with
rough
a.
Cut and
trim
out all
damaged
material,
leaving
surface
is then
applied
to the
catwalk.
An extensively
an opening
that is without square
corners.
damaged catwalk
should be replaced.
Damaged
areas
b. Chamfer
inside edges
to approximately
15 de-
may be repaired
in accordance
with the following
in-
grees
as illustrated.
structions.
Any repairs
must
restore
at least
the
c. Remove
the whitesurfacing
material inside
hop-
original
strength
to the repaired
area.
It is not
neces-
per by
sanding
with a
coarse
abrasive
for two
inches
sary
to remove
the
catwalk
for
repairs,
although
the
beyond
the chamfered
area.
Remove
surface
gloss,
wing
walk must
be removed
by carefully
peeling
it
on outside of hopper in the same manner.
,-
DAMAGED
AREA