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R22 SERVICE BULLETIN SB-103

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DATE: 30 April 2010
TO: R22 owners, operators, and maintenance personnel
SUBJECT: Main Rotor Blade Bond Inspection
ROTORCRAFT AFFECTED: R22-serieshelicopters with A016-4 main rotor blades.
TIME OF COMPLIANCE: At next 100-hour inspection, annual inspection, or by 31 July
2010, whichever occurs first, and at each 100-hour and annual inspectionthereafter.
BACKGROUND: Debonding of rotor blade skins can occur when the bond line is
exposed due to erosion of the blade finish, or when corrosion occurs on the internal
aluminum tip cap. Properinspection and protection (refinishing) of bonded areas is
required. Debonding resulting from improper inspection and maintenance could cause
a catastrophic accident.
COMPLIANCE PROCEDURE:
NOTE
Tofacilitate inspection, blade may be teetered down, collective fully
raised, and cyclic stick positioned to apply maximum up pitch.
1. Refer to Figures 1 and 2. Remove both main rotor blade tip coversand clean the
blades.
2. Using 10x magnification, visually inspect uncovered skin-to-tip cap bond joints. Using
a 1965-or-later United States quarter-dollar coin, tap test skin-to-tip cap bondjoints on
both upper and lower surfaces. If corrosion, separation, or voids are detected, blade is
unairworthy. Tap test tutorial video is available at: www.robinsonheli.com/support.htm.
3. Using 10xmagnification, visually inspect any exposed skin-to-spar bond line for gaps
(empty space between skin and spar). Blade is unairworthy if any gap, including “pin
hole(s)”, is detected in the bondline.
4. Refer to Figure 2. Mark outboard 120 inches of blade lower surface as shown to
identify skin-to-spar bond joint area.
5. Verify no visible dents within the bond joint area. Blade isunairworthy if bond joint
area is dented.
(OVER)

R22 SB-103
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6. Tap test the lower skin-to-spar bond joint and verify no voids exist. Blade is unairworthy
if a void is detected.
7....