What are Airworthiness Directives (ADs) and why must they be followed?

• A. ADs are regulatory directives requiring mandatory corrective actions to ensure airworthiness; non-compliance can compromise safety and regulatory status.
• B. ADs are voluntary guidelines for maintenance scheduling.
• C. ADs are recommendations for engineers' training.
• D. ADs are environmental compliance directives.

Answer: (A)

Airworthiness Directives are legally enforceable actions issued by aviation authorities to address an identified unsafe condition in an aircraft, engine, propeller, or installation. They require specific corrective actions—such as inspections, modifications, or part replacements—within defined timeframes to restore or maintain airworthiness. Because they are mandatory, operators must comply to keep the aircraft legally eligible to fly. Non-compliance can result in grounding of the aircraft, penalties, and loss of regulatory status, and it directly compromises safety by leaving the unsafe condition unaddressed. They aren’t voluntary guidelines, training recommendations, or environmental directives; those are separate types of guidance or requirements.