25 OCT 2010 R66 Maintenance Manual Chapter 62 Main Rotor Page 62.27
62-50 Repair of Main Rotor Blades
CAUTION
DO NOT USE power tools or chemical paint strippers to remove
blade materials.
1. Measure damage per Section 62-40.
2. Polish out blade damage using 220 grit or finer wet-or-dry aluminum-oxide or silicon-carbide
abrasive paper, and finish with 320 grit or finer wet-or-dry abrasive paper.
3. A fine-toothed file may be used along the spar and trailing edge, provided the area is
finished with 320 grit or finer wet-or-dry abrasive paper. Hand-sand or file in spanwise
direction.
4. Remove only the material necessary to reach the bottom of the damage, and to blend the
reworked area to the radius or dimension required. Visually inspect and verify all damage
is removed.
5. Measure reworked area and verify material removed and/or new chord dimension is
permissible per Section 62-40.
6. Seal and fill per Section 62-51, as required. Paint per Section 62-52, as required.
7. Track and balance main rotor per Chapter 18, as required.
62-51 Sealing, Filling, and Fairing
1. Clean area needing sealing, filling, and fairing with QSOL 220.
2. Apply Scotch-Weld structural adhesive #2216 B/A to bond joints with pin holes or other
openings in accordance with adhesive manufacturer’s instructions. Allow a minimum
of 24 hours cure time.
3. Using 240 grit or finer wet-or-dry aluminum-oxide or silicon-carbide abrasive paper, hand-
sand cured adhesive in spanwise direction to a smooth, aerodynamic finish, congruent
with the blade airfoil. Do not remove metal.
4. Hand-sand surrounding painted surface until 25% primer remains. Keep bare metal to
a minimum.
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