TM 55-1520-240-23-4
5-69.1
REPAIR BLADE FAIRING — FOAM FILLER
(Continued)
5-69.1
14.
Bond a piece of 120 or 240-grit abrasive paper
(E7 or E9) to a sanding block (13). Make the
block about 2 inches wide and long enough to
span the repair.
15.
Sand foam plug (14) flush with blade surface to
match blade contour. Use very light spanwise
strokes.
16.
Remove tape (11) from around repair.
17.
Prepare fiberglass skin patch (15) as follows:
a.
Cut patch (14) of fiberglass laminate (E168
or E168.1) 2 inches larger than foam plug
(14). Use scissors. Smooth rough edges by
sanding.
b.
Center patch (15) over foam plug (14). Check
that finish has been removed at least 1/2
inch beyond patch.
c.
Draw outline of patch (15) on blade surface.
d.
Lightly sand patch (15) to remove surface
glaze. Use 240-grit abrasive paper (E9).
Remove peel ply from patch if necessary.
NOTE
Patch will not adhere if surface glaze
is not removed.
e.
Put on protective gloves (E186). Gloves shall
be worn during the remaining steps of this
procedure.
NOTE
Do not soak blade with acetone. Use
damp cloths only.
f.
Clean patch (15) and bonding surface (16) of
blade. Use cloths (E120) damp with acetone
(E20). Wipe acetone dry immediately. Use
dry cloth (E120). Check patch and bonding
surface to ensure that they are properly
prepared.
INSPECT
5-383
