Airworthiness Directives (ADs) are legally enforceable regulations issued by the FAA in accordance with 14 CFR part 39 to correct an unsafe condition in a product. Part 39 defines a product as an aircraft, engine, propeller, or appliance.

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Types of ADs

• Emergency Airworthiness Directives (EAD)
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• Airworthiness Directives (AD Rules)
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• AD Notices of Proposed Rulemaking (AD NPRMs)
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• AD Biweekly
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