In the context of airworthiness, what does the owner or operator need to monitor?

Monitoring compliance with Airworthiness Directives (ADs) is essential for the owner or operator because these directives are legally enforceable rules issued by the Federal Aviation Administration (FAA) or equivalent authorities regarding safety issues affecting aircraft. ADs are often issued in response to safety defects or required changes in aircraft maintenance procedures, making adherence crucial to ensuring the airworthiness of an aircraft.

Failure to comply with ADs can result in significant safety hazards, increased liability, or even grounding of the aircraft, which emphasizes the importance of tracking and performing any required actions outlined in these directives.

While the other choices may be important from various operational and financial perspectives, they do not directly impact the inherent safety and regulatory compliance aspect of airworthiness as ADs do.