TM 1-1500-204-23-3
NOTE
If
adhesive
dry
times
are
exceeded, reapplication of one
coat of adhesive may be done
only once (total of three coats). If
dry
time
is
again
exceeded,
remove adhesive from applied
area using, acetone and/or buffing
with
emery
cloth
(120
grit
minimum).
(j) With a one-inch roller, roll over
repaired area to remove any trapped air. If innerliner
sticks to roller, dampen innerliner
with dean cloth
(item 16, table 2-11) dampened with acetone (item 3,
table 2-11). Wear gloves (item 4, table 2-11). Allow
cement to dry for 60 minutes minimum.
(k) Place a 10 to 25 pound shot bag
(item
23,
table
2-11)
on
repair,
if
practical.
Polyethylene, waxed paper (item 24, table 2-11) or
equivalent should be placed between the cemented area
and shot bag to prevent sticking of shot bag to repair.
Allow adhesive to dry 60 minutes minimum.
(I) Clean innerliner of fuel cell at least
1 3/4 inches larger in all directions around "Y" cut. Use
a piece of dean cheesecloth (item 16, table 2-11)
dampened with acetone (item 3, table 2-11).
(m) Lightly, hand buff innerliner of fuel
cell around '"r or "Y" cut, 1 3/4 inches in all directions.
(n) Clean buffed area. Use a piece of
dean cheesecloth (item 16, table 2-11) dampened with
acetone (item 3, table 2-11). The surface must be dean
and dry in order to apply patch.
(o) Cut a patch from fabric (item 19,
table 2-11). The patch should be 1 1/2 inches larger in
all directions around '" or "Y' cut. Lightly, hand buff gum
side (side with dull finish) of patch with emery cloth
(item 17, table 2-11). Remove buffing dust by wiping
patch with cheesecloth (item 16, table 2-11) dampened
with acetone (item 3, table 2-11). Wear gloves (item 4,
table 2-11).
NOTE
Do not apply adhesive beyond
buffed areas.
(p) Apply one coat of adhesive (item
18, table 2-11) to buffed side of patch and cell innerliner
and allow to dry 20-60 minutes.
(q) Apply a second coat of adhesive
(item 18, table 2-11) to buffed areas of patch and cell
innerliner and allow to dry until tacky. Adhesive can
become tacky within 2 to 4 minutes, depending on
ambient temperature and humidity. Perform knuckle
test.
(r) If necessary to restore tack of the
cemented surfaces, use a piece of cheesecloth (item 16,
table 2-11) dampened with acetone (item 3, table 2-11)
and lightly wipe over cemented areas. Allow solvent to
evaporate 10 to 20 seconds or until cemented areas
become "tacky." Wear gloves (item 4, table 2-11).
(s) While adhesive is still tacky, apply
patch to cemented area of the cell innerliner, centering
patch over damaged area. With the one-inch roller
(item 20, table 2-11), roll the patch to the cemented area
and roll it down so as not to trap air between patch and
innerliner.
(t) Place a 10 to 25 pound force by
damping (C clamp (item 21, table 2-11 ) and two pieces
of wood (item 22, table 2-11)), shot bag (item 23, table
2-11), etc., if practical on repair. Polyethylene, waxed
paper (item 24, table 2-11), or equivalent should be
placed between the patch and force applying device to
prevent sticking of the force applying device to the
repair.
(u) Allow repair to remain undisturbed
for at least 8 hours. The fuel cell should not be returned
to service for 24 hours.
(v) Visually
inspect
repair
for
workmanship, no loose edges, no voids, and adhesive
fully cured. If there is a defect in repair, recement per
above procedure.
Change 2 2-58