64-32 Dents (continued)
A. Skins
1. Refer to Figure 64-4. Smooth, round bottom dents with 0.060 inch minimum radius
may be repaired when damage does not exceed the following limits:
a. 0.010 inch maximum depth between leading edge and 0.75 inch aft (chordwise).
b. 0.75 inch aft (chordwise) of leading edge:
i. 0.090 inch maximum dent depth between RS 21.00 and RS 29.00.
ii. 0.030 inch maximum dent depth between RS 21.00 and inboard.
c. 0.030 inch maximum depth between trailing edge and 0.40 inch forward (chordwise).
d. 0.008 inch maximum depth between RS 29.00 and RS 30.00.
e. 0.008 inch maximum depth over the skin-to-root fitting bond joint and carbon
fiber bonded area.
2. Refer to Section 62-50 (main rotor) for repair procedures for damage within limits.
64-33 Erosion
Replace any blade where erosion has caused deformation or ripples in the leading edge.
64-34 Root Fitting Damage
1. Verify damage does not exceed the following limits:
a. No repairs permitted within 1.5-inch diameter circle from center of spherical bearing.
b. 0.040 inch maximum depth on other root fitting exposed areas.
2. Refer to Section 62-50 (main rotor) for repair procedures for damage within limits.
Blend out root fitting damage with a minimum 1.0 inch blend radius.
64-35 Nicks and Notches
A. Trailing Edge
1. Verify damage does not exceed the following limits:
a. 0.050 inch maximum in the extreme trailing edge.
2. Refer to Section 62-50 (main rotor) 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.
64-36 Painting
Refer to Figure 64-4. See Section 62-52 (main rotor) for painting procedures.
25 OCT 2010 R66 Maintenance Manual Chapter 64 Tail Rotor Page 64.11
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