AD Watch: Replacement OK'd For Hartzell Propellers

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The FAA last week issued a Final Rule regarding certain Hartzell propellers with aluminum blades, revising an existing Airworthiness Directive. Affected aircraft include models from Cessna, Piper, Beech and others (check the list). The new rule permits the replacement of affected propellers with Hartzell model "MV" series propellers as an alternative to the initial and repetitive inspections of the affected props. The change was prompted by type certification approval of the MV series propellers that are direct replacements for the affected propellers, and Service Bulletin approval to allow modification of affected propellers to the MV type design configuration. The revised AD is effective July 31. The AD is intended to prevent blade separation due to cracked blades, hubs, or blade clamps, which can result in loss of control of the airplane.