Are airworthiness directives considered mandatory?

Airworthiness directives (ADs) are indeed considered mandatory. These directives are issued by the Federal Aviation Administration (FAA) or other regulatory authorities to address unsafe conditions in specific aircraft or products. When an AD is published, it often requires operators to perform certain actions, which may include inspections, modifications, or the replacement of parts.

Compliance with ADs is mandatory for all affected operators, ensuring that any issues that could potentially compromise safety are addressed promptly. This mandatory nature is crucial for maintaining the safety and airworthiness of aircraft in operation, as failure to comply can lead to serious safety risks and legal repercussions for operators.

The other choices suggest that compliance may be optional or limited to certain conditions or types of operations, but this does not align with the regulatory framework governing ADs, which applies broadly to ensure comprehensive safety across all applicable aircraft.