What method does the GACA use to inform aircraft owners of unsafe conditions?

The correct answer is rooted in the specific regulatory framework governing aviation safety. Airworthiness Directives (ADs) are formal and legally binding notifications issued by aviation authorities, including the General Authority of Civil Aviation (GACA), to inform aircraft owners and operators about unsafe conditions that may affect the airworthiness of the aircraft. These directives mandate corrective actions to be taken to mitigate identified risks, ensuring the safety of the aircraft operation.

Airworthiness Directives are often based on findings that may arise from safety investigations, reports, or ongoing airworthiness assessments. They provide guidance on the necessary modifications, inspections, or other compliance measures required to maintain the aircraft's safe operation. In contrast, the other options, while related to aviation safety, do not carry the same legal enforceability and specific focus on immediate action required to address unsafe conditions.