Who is primarily responsible for maintaining an aircraft in an airworthy condition?

The owner or operator of the aircraft holds the primary responsibility for maintaining it in an airworthy condition. This responsibility encompasses ensuring that the aircraft is in compliance with all applicable regulations, is properly maintained according to the manufacturer's guidelines, and is safe for operation. The owner or operator must perform regular inspections, repairs, and necessary maintenance to ensure the aircraft can be safely operated.

While the pilot in command plays a crucial role in performing pre-flight inspections and ensuring the aircraft’s condition before flight, their responsibilities do not extend to maintenance. Mechanics can perform maintenance and repairs, but the ultimate accountability for the airworthiness of the aircraft lies with the owner or operator. The role of international organizations is to set standards and regulations but not to maintain individual aircraft, which confirms the owner's or operator's pivotal role in upholding the airworthiness of their aircraft.