25 OCT 2010 R66 Maintenance Manual Chapter 62 Main Rotor Page 62.23
62-43 Spar Damage
1. Refer to Figure 62-13. Spar damage limits exclude leading edge cap. Verify damage
does not exceed the following limits:
a. 0.020 inch maximum depth between RS 70.00 and RS 198.00.
b. Replace blade if erosion has reduced thickness at spar leading edge to 0.040 inch.
c. Replace blade if erosion has cause ripples in or deformation to spar leading edge.
2. Refer to Section 62-50 for repair procedures for damage within limits. Blend out spar
damage with a minimum 1.0 inch blend radius.
62-44 Root Fitting Damage
1. Refer to Figure 62-14. Verify damage does not exceed the following limits:
a. 0.040 inch maximum depth on outside diameter of flange.
b. 0.002 inch maximum depth on area 0.35 inch outboard of flange.
c. 0.060 inch maximum depth on other root fitting exposed areas.
2. Refer to Section 62-50 for repair procedures for damage within limits. Blend out root
fitting damage with a minimum 1.0 inch blend radius.
62-45 Nicks and Notches
A. Blade Trailing Edge (see also Blade Tip)
1. Refer to Figure 62-15 and Section 62-50 for repair procedures for damage within
limits. Blend out nicks and notches in blade trailing edge for 1.0 inch minimum each
side of nick or notch (with a minimum 12 inch blend radius).
2. Refer to Figure 62-16. After repair, verify minimum chord is within the following
limits:
a. 12.15 inch minimum chord between RS 124.00 and RS 194.00.
b. 11.46 inch minimum chord between RS 19.55 and RS 122.00.
3. See Section 62-42 for additional inspection criteria.
B. Blade Tip
1. Refer to Figure 62-17. Using a fine-toothed hand file, file in spanwise or chordwise
direction, within limits indicated. Remove file marks using 220 grit or finer aluminum
oxide abrasive paper.
2. File trailing edge to maintain square edge at skins, perpendicular to chord line, per
Figure 62-15. Seal exposed trailing edge bond joint.
3. Track and Balance Main Rotor per Chapter 18.
C. Trim Tab Trailing Edge
1. Verify damage does not exceed 0.050 inch chordwise or 0.30 inch spanwise.
2. Refer to Figure 62-15 and Section 62-50 for repair procedures for damage within
limits. Blend out nicks & notches in trim tab trailing edges, 1.0 inch minimum each
side of nick or notch (with a minimum 12 inch blend radius) keeping edge parallel
with blade trailing edge.
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