What requirement associated with Airworthiness Directives allows certificated mechanics to work on propellers?

The requirement allowing certificated mechanics to work on propellers, particularly in relation to Airworthiness Directives, centers around whether the work constitutes a minor alteration. When the maintenance or alteration of a propeller falls under the category of a minor alteration, it can be performed by a certificated mechanic without requiring additional oversight from an approved repair station or manufacturer.

This provision facilitates the efficient maintenance of aircraft by allowing qualified mechanics to address less complex repairs and alterations directly, thereby ensuring that the aircraft remains airworthy while also adhering to regulatory standards. In contrast, major alterations generally require more stringent oversight, including manufacturer approval or additional certifications.

Understanding this distinction helps ensure that maintenance procedures comply with safety regulations while also leveraging the capabilities of certificated mechanics to maintain and restore aircraft parts like propellers effectively.