TM 55-1520-240-23-4
5-67.1
REPAIR BLADE SPAR ROOT END — MAJOR DAMAGE
(Continued)
5-67.1
10.
Apply a layer of adhesive (E40, E41, E43 or
E47.1) to damage area (3). Position smallest
patch (4) at bottom of damage area.
11.
Continue to apply layers of adhesive and patches
(4). Overlap each patch with larger patch. Be
sure patches are soaked with adhesive. Cover
the top patch with adhesive.
12.
Bond repair area (3) as follows:
a.
Cover repair with layer of peel ply (E270) (5)
and layer of Teflon-impregnated fabric (E170)
(6). Make layers large enough to overlap
patch (3) 1 inch.
b.
Cover Teflon-impregnated fabric (E170) (6).
Use thick rubber pad (E318) (7).
c.
Cover repair area. Use fiberglass cloth
(E132) (8). Cut cloth large enough to cover
rubber pad (E318) (7).
d.
Surround cloth (E132) (8) with sealing tape
(E396) (9). Keep tape clear of cloth.
e.
Attach tube (10) to vacuum pump hose.
f.
Wrap tube (10). Use two layers of fiberglass
cloth (E132) (8). Apply masking tape (E388)
(11) over cloth.
g.
Position tube (10) on cloth (E132) (8)
covering repair. Wrap tube with sealing tape
(E396) (9) where tube crosses sealing tape
(9) already applied.
h.
Press tube (10) onto tape (9) to make airtight
seal.
i.
Press polyvinyl sheet (E284) (12) smoothly
onto tape (9) to make airtight seal.
j.
Start vacuum pump. Check for leaks.
Reposition polyvinyl sheet (E284) (12) or add
tape (E396) (9) as needed.
k.
Maintain 20 inches Hg vacuum through
adhesive cure.
5-336
