Robinsons R66 - 64-30 Tail Rotor Blade Inspection and Repair; 64-31 Scratches and Corrosion

64-30 Tail Rotor Blade Inspection and Repair
This blade repair procedure outlines the repair limits, methods and materials used for repairing
tail rotor blades. Repairs are limited to blending out scratches, dents, nicks, removing corrosion,
and renishing the blades. The inspections, repairs and limitations contained herein refer to
damage sustained in service, including damage during shipping and handling (manufacturing
irregularities are treated separately by the factory). In-service damage will generally exhibit
paint scufng or scratches and often times freshly-exposed metal in the form of scratches
in the nish. If there are any questions as to the possibility of a manufacturing irregularity,
contact RHC Technical Support.
CAUTION
A blade may be repaired more than one time. However, in no
case can more than the maximum material be removed or the
maximum dent depth be exceeded in any one location.
Refer to Section 62-40 for measuring blade damage.
64-31 Scratches and Corrosion
1. Refer to Figure 64-4. Verify damage does not exceed the following limits:
a. 0.008 inch maximum damage between RS 18.00 and RS 30.00.
b. 0.005 inch maximum damage more than 15° spanwise between RS 18.00 and inboard.
c. 0.008 inch maximum damage less than 15° spanwise between RS 18.00 and inboard.
2. Refer to Section 62-50 (main rotor) for repair procedures for damage within limits.
Blend out scratches or corrosion on skins with a 0.10 inch blend radius.
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."
25 OCT 2010 R66 Maintenance Manual Chapter 64 Tail Rotor Page 64.9