Which of the following is a focus of CAR standards regarding maintenance?

The focus of CAR standards on maintenance encompasses not just regular upkeep or routine checks, but specifically addresses major repairs and modifications. This is crucial because major repairs and modifications can significantly impact the safety and airworthiness of the aircraft. The regulatory framework requires that such activities adhere to stringent guidelines to ensure that any changes made do not compromise the integrity of the aircraft.

By concentrating on major repairs and modifications, these standards ensure that all significant alterations are performed following approved procedures and are documented appropriately. This focus is vital because these types of maintenance actions often involve complex systems that require careful oversight to maintain compliance with safety regulations and operational standards.

In contrast, routine checks, while important, are typically covered under different maintenance requirements that might not necessarily involve the same level of regulatory scrutiny as major repairs. Flight training procedures and passenger safety regulations, while critical to operational safety, fall outside the specific realm of maintenance-related CAR standards. Therefore, addressing major repairs and modifications aligns directly with the overarching goal of maintaining high safety and performance standards within the aviation industry.