Which aircraft categories can Airworthiness Directives (ADs) be issued for?

Airworthiness Directives (ADs) can be issued for a wide variety of aircraft categories to address specific safety issues or concerns that may arise due to design, manufacturing defects, or operational conditions. These directives are mandatory and are aimed at ensuring the continued airworthiness of affected aircraft.

The categories of aircraft that can have ADs issued include both experimental and primary aircraft as well as restricted and standard categories. This means that regardless of the classification of the aircraft, if a safety issue is identified that affects its airworthiness, an AD may be issued.

For example, an experimental aircraft, which is primarily used for testing or displaying new technologies, may receive an AD if a flaw is discovered that could impact safety. Similarly, standard aircraft, which are typically operated for commercial and general aviation purposes, are also subject to ADs when safety concerns arise.

This inclusive approach ensures that all types of aircraft, regardless of their use or category, adhere to necessary safety standards, thus maintaining a high level of operational safety across the aviation industry.