Cessna 188 Series Service Manual 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