Summary
The FAA proposes to supersede Airworthiness Directive (AD) 97- 26-02 for Eurocopter Deutschland GmbH Model BO-105A, BO-105C, BO-105S, BO-105LS A-1, and BO-105LS A-3 helicopters; and Eurocopter Canada Ltd. Model BO-105LS A-3 helicopters. AD 97-26-02 requires a repetitive visual inspection for cracks in the ribbed area of the main rotor (M/R) mast flange (flange), and depending on the outcome, replacing the M/R mast. Since the FAA issued AD 97-26-02, it has been determined that a certain reinforced M/R mast is not affected by this unsafe condition. This proposed AD would retain the requirements of AD 97-26-02 and remove the reinforced M/R mast from the applicability. The actions of this proposed AD are intended to address an unsafe condition on these products.