When must an Airworthiness Directive (AD) be complied with after it becomes effective?

The correct answer is based on the requirements outlined in the Airworthiness Directive (AD) itself. An AD will specify the compliance timeframe that must be adhered to, which can vary depending on the urgency and nature of the safety issue addressed by the directive.

For instance, some ADs might require immediate action, while others may allow for a longer compliance period. It is crucial for operators and maintenance personnel to thoroughly read each AD when it is issued to understand the specific compliance deadline and any associated instructions regarding the necessary actions.

This flexibility ensures that the AD can be tailored to the severity and implications of the airworthiness issue at hand, providing a structured approach to ensuring safety in aviation operations.