TM 55-1520-240-23-4
5-67
REPAIR BLADE SPAR ROOT END MINOR DAMAGE
(Continued)
5-67
3.
Repair damaged area (1) as follows:
NOTE
Working life of adhesive mixture is 30
minutes.
a.
Fill damaged area (1). Use adhesive (E40
or E41).
b.
Fair adhesive flush with area (3) around
damaged area (1). Use tongue depressor
(E424).
c.
Cut silicone rubber (E318) (4), peel ply
(E270) (5), and Teflon-impregnated fabric
(E170) (6) 1 inch larger, on all sides, than
area (3).
d.
Cover area (3). Use peel ply (E270.1) (5) and
Teflon-impregnated fabric (E170) (6).
e.
Place silicone rubber (E318) (4) over
Teflon-impregnated fabric (E170) (6). Bend
rubber to blade spar contour.
f.
Press silicone rubber (E318) (4) down. Wrap
tape (E388) (7) around blade spar (2) over
rubber. Position shot bag (8) over tape.
Blade temperature must not exceed
160ºF (71ºC). Overheating will
damage fiberglass.
4.
Cure repair at 140º - 160ºF (60º - 71ºC)
for 2 hours. Use heat lamp. Monitor blade
temperature. Use temperature indicating strips
(E413).
NOTE
If heat lamp is not available, cure at
70º - 80ºF (21º - 27ºC) for 24 hours.
Shot bag can be removed after 12
hours.
5.
Remove shot bag (8), tape (7), rubber (E318)
(4), and Teflon-impregnated fabric (E170) (6).
6.
Blend repaired area. Use abrasive paper (E9).
INSPECT
FOLLOW-ON MAINTENANCE:
Refinish blade (Task 5-82).
END OF TASK
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