Maintenance and Modifications
AD supercedes Robinson blade service bulletin
On the heels of a Service Bulletin, the FAA has issued Airworthiness Directive 2007-26-12 focusing on Robinson R22 and R44 main rotor blade delamination.

On the heels of a Service Bulletin, the FAA has issued Airworthiness Directive 2007-26-12 focusing on Robinson R22 and R44 main rotor blade delamination.

The AD notes that main rotor blade skins begin to debond at the skin-to-spar bond line on the lower surface near the blade tip. Debonding can occur when the bond line is exposed due to excessive erosion of the blade finish or when corrosion attacks
the internal aluminum tip cap.

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