TM 55-1520-240-23-4
5-72
TRAILING EDGE REPAIR — MAJOR DAMAGE
(Continued)
5-72
Adhesive used in the manufacturing of
some fiberglass rotor blades contain
asbestos. During blade repair, strict
adherence to all safety procedures
when working with asbestos must
be complied with (applies to blade
serial number A-1-0001 to 1465 and
A-2-0001 to 1473 only).
NOTE
There is no limit to the number of
repairs that can be made. Minimum
edge-to-edge distance between
repairs shall be 6 inches.
1.
Check location and size of major damage to
trailing edge (1).
a.
Reparable damage of trailing edge (1)
shall not exceed 1-1/4 inches chordwise.
Spanwise damage is not limited.
b.
Damage greater than 1-1/4 inches chordwise
requires rejection of the rotor blade.
2.
Mask damaged area (2) as follows:
a.
Apply tape (E388) (3) spanwise 3 inches
from trailing edge (1).
b.
Apply tape (E388) (4) chordwise 2 inches
from edges of damaged area (2).
3.
Remove finish from area inside tapes (E388) (3
and 4). Use abrasive paper (E7) and sanding
block. Soften finish, if needed. Use acetone
(E20). Remove tapes (3 and 4). Wear gloves
(E186).
4.
Have helpers turn blade (5) upside down.
5.
Draw rectangle outline around damaged area
(2). Do not exceed dimensions in step 1.
Do not cut forward of guide line around
damaged area. Cutting chordwise
farther than line will damage blade
structure and require rejection of the
blade.
6.
Cut inside guide line to remove damaged area
(2). Use a saber saw or hacksaw.
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