When is a mechanic obligated to verify compliance with Airworthiness Directives (AD)?

A mechanic is obligated to verify compliance with Airworthiness Directives (AD) during any required inspection under part 91, 125, or 135 because these regulations dictate standards for the airworthiness of aircraft and the necessity to ensure ongoing compliance with ADs. Airworthiness Directives are legally enforceable regulations issued by the FAA that provide the means to ensure that identified safety issues or noncompliance with standards are addressed.

During scheduled inspections mandated by these parts, mechanics must evaluate not only the general condition of the aircraft but also ensure that any applicable ADs have been complied with. This obligation is essential to maintaining aviation safety and ensuring that aircraft meet legal and operational standards.

In contrast, the other scenarios listed, such as completion of flight training, sales of aircraft, or upgrading an aircraft, do not inherently require a mechanic to verify AD compliance. While compliance may be considered during those events, it is not a federal requirement tied to inspections as outlined in the regulations.