TM 55-1520-240-23-4
5-72
TRAILING EDGE REPAIR — MAJOR DAMAGE
(Continued)
5-72
9.
Prepare surfaces for bonding as follows:
Surface glaze must be removed from
insert and doublers. Poor bond will
result if glaze is not removed.
a.
Sand both sides of doublers (10) and insert
(9) lightly to remove surface glaze. Use
abrasive paper (E9).
b.
Wear gloves (E186). Clean bonding surfaces
of doublers (10), insert (9), and trailing edge
(1). Use cloth (E120) damp with acetone
(E20). Wipe dry with clean cloth before
acetone evaporates.
10.
Position doublers (10) on clean surface with
lower doubler extending past upper doublers by
1/8 inch at trailing edges.
10.1.
If fiberglass laminate (E168.1) is used, ensure
that outer edges of doublers (10) are curled
towards the blade.
11.
Hinge doublers (10) at trailing edges. Use Teflon
tape (E399).
NOTE
Prepackaged adhesive (E40) is
preferred. Use adhesive (E41, E43, or
E47.1) only when adhesive (E40) is
not available.
12.
Mix prepackaged adhesive (E40). Follow
instructions in kit.
NOTE
Correct adhesive weight is required to
obtain good bond.
13.
If adhesive (E40) is not available, prepare
alternate adhesive as follows:
a.
For adhesive (E41), weigh 100 parts of resin
and 23 parts of hardener. Mix until color is
uniform. Use polyethylene cup (E157) and
wood spatula (E424).
b.
For adhesive (E43), weigh 7 parts of gray
hardener and 5 parts of white base. Mix
until color is uniform. Use polyethylene cup
(E157) and wood spatula (E424).
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