Beechcraft 76 Duchess — Service Bulletins

This document is an Alert Service Bulletin (HC-ASB-61-297) issued by Hartzell Propeller Inc. specifically addressing the inspection requirements for left-hand rotating aluminum hub compact propellers installed on certain aircraft, including the Beechcraft 76 Duchess. The bulletin outlines the compliance requirements for propeller hub inspections, detailing the affected propeller models and the necessary actions to ensure continued airworthiness. It emphasizes the importance of adhering to the latest revision to avoid unsafe conditions that could lead to serious accidents. The bulletin includes instructions for initial and repetitive inspections, as well as optional terminating actions for compliance.

• Affected aircraft include Beech 76 Duchess, Piper Seneca PA-34-200, and Piper Seminole PA-44-180.
• Initial inspection required within 50 flight hours or 12 calendar months from September 17, 2007.
• Repetitive inspections must occur at intervals not exceeding 50 flight hours or 12 calendar months.
• Eddy current inspections must be performed by certified personnel.
• Optional hub replacement with 'A' or 'B' suffix is available as a compliance action.