Airworthiness Directives; Lifesavings Systems Corp., D-Lok Hook Assembly

We are adopting a new airworthiness directive (AD) for the Lifesavings Systems Corp., D-Lok Hook assembly installed on certain rescue hoist assemblies. This AD results from a mandatory continuing airworthiness information (MCAI) AD issued by the European Aviation Safety Agency (EASA), which is the Technical Agent for the Member States of the European Community. The MCAI AD states that rescue hoist operators have reported surface irregularities and discontinuities on certain D-Lok Hooks because of an unapproved change in the hook design and manufacturing process from forged material to cast material that have different physical properties. The actions are intended to prevent failure of a hook during rescue hoist operations, loss of the rescued passenger, and subsequent serious injury or fatality.