APR 2019 Chapter 64 Tail Rotor Page 64.13
64-32 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.
WARNING
Any damaged tail rotor blade that cannot be repaired within the
limits of this section must be removed from service immediately
and marked "scrap."
A. Skins
1. Refer to Figure 64-5. 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 27.43
(F029-2) or RS 29.00 (F029-1).
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 27.43 and 28.43 (F029-2) or RS
29.00 and RS 30.00 (F029-1).
e. 0.008 inch maximum depth over the skin-to-root fitting bond joint.
f. No dents are permitted on carbon fiber bonded area.
2. Refer to § 62-50 (main rotor) for repair procedures for damage within limits.
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