TM 1-1500-204-23-11
plugs, but silicone sheet stock is
slotted discs over the damage and
recommended. If alternate materi-
mark the perimeter of the damage
als are used, they must be wrapped
on the outer disc as an installation
in non-porous release ilm before
aid.
insertion into the repair stack up to
be able to remove them later.
Clean the backside of the repair
p
area with the appropriate solvent.
k
Drill or punch a 0.25 inch hole
through the center of each iller
Using 150 to 180 grit abrasive
q
plug.
paper, as described in paragraph
6-7, abrade the backside of the
Cut a backup plate from any alu-
l
repair area. Hold the abrasive
minum sheet stock at least 2 inches
paper under the foreingers and
larger than the damage size in all
reach through the damaged open-
directions. The aluminum sheet
ing. Using a side-to-side motion,
shall be of suficient thickness to
work around the circumference of
prevent bending when clamping
the opening until the surface is
pressure is applied.
roughened. Inspect the sanded
area using an inspection mirror and
Drill a 0.25 inch hole through the
m
a lashlight. Repeat the sanding
center of the backup plate.
until there are no missed areas.
n
Thread two 0.25 inch nylon nuts
Clean the abraded area using the
r
onto one end of the 0.25 inch
appropriate solvent and puriied,
threaded nylon rod. Torque the
lint-free wiping cloth per paragraph
nuts against one another thereby
6-5. Continue cleaning until no
forming a bolt head. To facilitate
residue is seen on the cloths.
installation of the slotted disc com-
ponents, remove the threads using
s
Clean each of the backside seal
abrasive cloth from the end of the
components with solvent. Place
threaded rod opposite the nuts,
each part on a clean piece of bag-
leaving 3 inches of thread at the
ging ilm. Take care to not remove
nut end.
the perimeter mark on the outer-
most slotted disc.
Test it the backside seal compo-
o
nents to the damage area. Slide
NOTE
the stiffener plate onto the nylon
Adhesive of combined parts A and B will
rod. Holding the nylon rod by the
be uniform in color when properly mixed.
threadless end, pass the stiffener
Part A of adhesive may require stirring after
plate through the damage opening.
prolonged storage as chemical agents of part
Next, slide the slotted disc onto the
A may separate. To ensure accurate mix
rod. If more than one disc is used,
ratio, a minimum of 25 grams of adhesive
slide the smaller of the two discs on
should be mixed.
the rod irst. Flex the slotted disc
so the slot opens. Slide the slot
Mix the paste adhesive per para-
over the edge of the damage open-
t
graph 6-17. Handle prepared sur-
ing. Next, feed the disc through
faces wearing powder free latex
the opening by pushing and rotat-
gloves until patch bonding is com-
ing the rod and disc in a circular
plete. If patch or spacer is not to
motion around the hole. Insert the
be bonded immediately, cover with
larger slotted disc in the same fash-
clean barrier material and secure
ion. Check for any interference and
with preservation tape to prevent
modify slotted discs as necessary
to achieve a good it. Center the
6-62