Which of the following best describes the outcome of an airworthiness directive?

• A. It changes pilot licensing requirements.
• B. It updates weather minimums.
• C. It requires corrective action for an identified unsafe condition in an aircraft type.
• D. It creates new flight routes.

Answer: (C)

Airworthiness directives are regulatory actions issued by the aviation authority when an unsafe condition is identified in a specific aircraft type or design. When such a condition is found—often from manufacturer data, service reports, or investigations—the authority requires actions to correct it. The outcome is that operators must perform prescribed steps to restore safety, such as inspections, replacements, design modifications, or operational restrictions, within set deadlines. These directives are mandatory and enforceable, applying to all affected aircraft or particular serial numbers and may be one-time or ongoing if the issue requires monitoring.

This differs from licensing changes for pilots, which govern credentials rather than aircraft safety; from weather minimums, which relate to flight conditions, not airworthiness; and from route changes, which concern flight planning and airspace use rather than aircraft defects.