TM 55-1520-240-23-4
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REPAIR BLADE FAIRING — PARTIAL DEPTH
(Continued)
5-69
17.
Sand core (20) flush with tape (E399) (22). Use
sanding block about 2 inches wide and long
enough to span length of repair, and abrasive
paper (E6). Use spanwise strokes. Remove
tape.
18.
Matchmark core (20) and skin (21). Remove
tape (22), core (20), and scrim cloth (19).
19.
Clean cutout (13). Use vacuum cleaner.
20.
Prepare skin patch (22) as follows:
a.
Position core (20) on piece of fiberglass
laminate (E168 or E168.1) (23) with fibers
at 45º to chord.
b.
Draw outline (24) of core (20) on fiberglass
laminate (E168 or E168.1) (23) 1 inch larger
than core outline. Use pencil compass and
straightedge as required. Remove core.
c.
Cut skin patch (23). Use scissors. Smooth
rough edges. Use abrasive paper (E7).
d.
Check that patch (22) is 1 inch larger than
core (20) on all sides. Check that blade
surface finish is removed 1/2 inch around
patch.
e.
Trace patch outline (25) onto skin (21).
f.
If fiberglass laminate (E168.1) is used for
patch (23), remove peel ply from patch
surfaces. Clean with acetone (E20). Wipe
dry with clean cloth (E120).
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