25 OCT 2010 R66 Maintenance Manual Chapter 62 Main Rotor Page 62.21
62-42 Dents
CAUTION
Tap-test dented areas in honeycomb. If any voids are found
associated with dents, contact RHC Customer Service.
Tap-test voids, debonds, and dents in blades using an AN970-4
washer or 1965 or later U.S. quarter dollar coin in good condition.
CAUTION
When dented areas are found, inspect opposite side of the blade
for a bulge. Replace blade with a bulge greater than 0.010 inch
opposite a dent.
CAUTION
Do not repair any dent that has a sharp cut or break in the
skin. If necessary, locally penetrant inspect, keeping penetrant
materials away from bond joints.
A. Skins and Doublers
1. Refer to Figure 62-11. Smooth, round bottom dents with 0.060 inch minimum
radius that occur in honeycomb and unsupported areas of the blade as listed below
may be repaired when damage does not exceed the following limits:
a. 0.125 inch maximum depth dent between RS 162.90 and RS 196.50
b. 0.090 inch maximum depth dent between RS 124.00 and RS 162.90.
c. 0.030 inch maximum depth dent between RS 70.00 and RS 124.00.
d. Maximum area of any dent or dents is 12 square inches and maximum length is
2.0 inches between RS 70.00 and RS 162.90.
e. Maximum area of any dent or dents is 24 square inches and maximum length is
4.0 inches between RS 162.90 and RS 196.50.
f. Replace blade with any dent in 0.7 inch area immediately aft of skin-to-spar bond
line.
g. For dents in skins and/or doublers inboard of RS 70.00, contact RHC for repair
procedures.
2. Refer to Part C for leading edge cap damage. Refer to Section 62-50 for repair
procedures for damage within limits.
B. Trailing Edge Bond Joints
1. Refer to Figure 62-12. Verify damage does not result in an edge void and does not
exceed the following limits:
a. 0.030 inch maximum damage between RS 70.00 and RS 124.00.
b. 0.060 inch maximum damage between RS 124.00 and 198.00.
c. Refer to Part A, step 1(d).
2. Refer to Section 62-50 for repair procedures for damage within limits. Blend out
dents in trailing edge bond joints with a 0.10 inch blend radius.
C. Leading Edge Cap
1. Verify damage does not result in a crack or tear and dent depth does not exceed
0.020 inch.
2. Dents do not require blending or filling. Dents may be blended with a 0.10 blend radius.
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