When does an Airworthiness Directive become applicable?

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Airworthiness Directives are legally enforceable safety notices issued by the aviation regulator when there is an unsafe condition in a specific aircraft, engine, propeller, or part. They become applicable as soon as the regulator mandates compliance for that particular aircraft model or component, outlining the required actions (such as inspections, modifications, or replacements) and the timelines to do them. Compliance is mandatory to maintain airworthiness, and the directive applies to the defined fleet or components, not just as optional guidance. It’s not dependent on a manufacturer-issued recall, and it’s not limited to military aircraft; civilian aircraft covered by the regulator’s authority are included.