13-38.
Standard buffing compounds on
transparent plastics are usually
composed of very fine alumina in
combination with which of the
following materials?
1.
Wax only
2.
Tallow only
3.
Wax or tallow only
4.
Wax, tallow, or grease
13-39.
When you mount plastic panels,
what is the minimum prescribed
thickness for the packing
material?
1.
1/16 in.
2.
1/8 in.
3.
3/16 in.
4.
1/4 in.
13-40.
When repairing minor surface
damage to reinforced plastics, you
should apply which of the
following materials to the damaged
area?
1.
Two coats of catalyzed resin
heated to 112°F
2.
One or more coats of room-
temperature catalyzed resin
3.
Three coats of paste composed
of catalyzed resin and nylon
fibers heated to 137°F
4.
One coat of room-temperature
paste composed of catalyzed
resin and short glass fibers
13-41.
When using the stepped method to
repair ply damage to solid
laminates, which of the following
procedures should you observe to
ensure maximum strength of the
repaired area?
1.
Cut the replacement glass
fabric pieces to an exact fit
with the weave running in the
same direction as the existing
plies
2.
Ensure that the replacement
pieces are slightly thicker
than the existing plies
3.
Install the replacement pieces
with the fabric plies
overlapping the existing plies
4.
Replace every other piece of
damaged fabric
13-42.
A reinforced plastic component
with a honeycomb core has damage
that extends completely through
one facing and into the core.
What is the preferred method of
repair for this component?
Plugged
Stepped
Scarfed
Delaminated ply
13-43.
The scarfed method is normally
used to repair small punctures in
reinforced plastics up to what
maximum dimension?
3 or
4 in.
5 or
6 in.
7 or
8 in.
9 or 10 in.
13-44.
When repairing a puncture in a
piece of reinforced plastic using
the stepped method, what material
should you use to cover the repair
area while it cures?
1.
Graphite grease
2.
Petroleum jelly
3.
Cellophane sheeting
4.
Aluminum barrier paper
13-45.
Rain erosion-resistant coating
MIL-C-7439, Class II, has an
additional surface treatment
included in the kit for what
purpose?
To absorb radar waves
To minimize radio noise
To reflect ultraviolet light
To lower its internal working
temperature
13-46.
A sandwich construction material
is delaminated with facing-to-core
voids of less than 2.5 inches in
diameter.
Which of the following
repair methods should you use?
1.
Apply a flush patch by using
thick cloth soaked in
Thermofoam 706
2.
Apply a coat of Thermofoam 706
to the surface and cover it
with kraft paper
3.
Inject a nonexpandable forming
resin into the drilled holes
over the void area with a
syringe
4.
Inject an expandable forming
resin into the drilled holes
over the void area with a
pressure-type caulking gun
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