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Sensenich has released Service Bulletin SB 2017-08-17 for aircraft blades with Type A shanks, which includes most two blade propellers used on Rotax 912 series, Jabiru, and Aerovee engines.  This SB does not apply to R68C/L68C blades used on Rotax three blade propellers, UL Power composite propellers, or Lycoming/Continental composite propellers.