Robinson Helicopter Company RTR 660, Maintenance Manual

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62-46 Voids and Debonds
NOTE
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.
A. Tip Caps, Spars, and Trailing Edges
1. Refer to Figures 62-18. Verify no continuous void larger than 0.10 square inch.
90% of the area must be securely bonded. Voids separated by 0.25 inch or less
spanwise are considered continuous.
B. Doublers
1. Refer to Figures 62-19. Voids or debonds in doublers are not field-repairable.
a. Critical Areas: Area less than 0.50 inch spanwise and less than 0.30 inch
chordwise from edge of doubler. Verify no individual void larger than 0.10 square
inch except at the doubler finger tips. The finger tips may be debonded from the
outboard tip to 1.0 inch inboard. Voids that are separated by less than 0.25 inch
shall be considered continuous.
b. Non-Critical Areas: Area more than .50 inch spanwise or more than .30 inch
chordwise from doubler edges. Verify void does not exceed 2.0 inches chordwise
by 7.0 inches spanwise maximum continuous void. Voids that are separated by
less than 0.25 inch shall be considered continuous. Total area of any void may
not exceed 6.0 square inches.
2. If voids or debonds are beyond limit, contact RHC Technical Support.
C. Honeycomb
1. Refer to Figures 62-20. Verify damage does not exceed the following limits:
a. 1.50 inch chordwise or 20.00 inch spanwise maximum continuous void between
RS 121.00 & inboard. Total area of any void may not exceed 15.0 square
inches.
b. 2.50 inch chordwise or 20.00 inch spanwise maximum continuous void between
RS 121.00 & RS 196.50. Total area of any void may not exceed 15.0 square
inches.
25 OCT 2010 R66 Maintenance Manual Chapter 62 Main Rotor
Page 62.25