TM 55-1520-240-23-4
5-68
REPAIR BLADE FAIRING — SINGLE SKIN FULL DEPTH
(Continued)
5-68
14.
Position core material (E145 or E146) (11) on
blade (12) next to cutout (13). Locate trailing
edge (14) of core material 3 inches forward of
blade trailing edge (15).
15.
Apply masking tape (E388) (16) to cover area on
core material (E145 or E146) (11) slightly larger
than cutout area.
16.
Draw outline (17) on tape (E388) (16) in shape of
cutout (13) and 1/8 inch larger.
NOTE
Repair plug must have same contour
as blade and be slightly larger than
cutout.
17.
Cut core material (E145 or E146) (11) on tape
outline (17). Use knife. Remove tape (E388)
(16).
18.
Position core (11) in cutout (13). Check that core
projects above skin (9) at all points.
19.
Apply Teflon tape (E399) (18) around cutout (13).
20.
Sand core (11) flush with tape (E399) (18). Use
sanding block about 2 inches wide and long
enough to span length of repair, and abrasive
paper (E6). Use spanwise strokes. Remove
tape.
21.
Matchmark core (11) and skin (9). Remove core.
22.
Prepare skin patch (19) as follows:
a.
Position core (11) on piece of fiberglass
laminate (E168 or E168.1) (21) with fibers
at 45º to chord.
b.
Draw outline (20) of core (11) on fiberglass
laminate (E168 or E168.1) (21). Draw outline
1 inch larger than core. Use pencil compass
and straightedge.
c.
Cut skin patch (19). Smooth rough edges.
Use abrasive paper (E7).
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