What is a "major repair" in the context of aircraft maintenance?

A "major repair" in the context of aircraft maintenance refers to any repair that significantly alters the aircraft's structure, performance, or safety. This classification is crucial because it implies that the repair will have a substantial impact on how the aircraft operates and its overall safety. Major repairs typically involve structural components, systems that affect flight performance, or any modifications that will change the way an aircraft is certified for operation.

For example, if a major structural component like a wing or fuselage is repaired or replaced, it requires stringent compliance with regulatory standards and possibly additional inspections to ensure that the aircraft is still safe to operate. Such repairs often need to be documented and reported to aviation authorities, and they typically must be carried out by certified professionals to ensure compliance with safety regulations.

The other options do not meet the definition of a major repair. Minor cosmetic fixes do not affect the aircraft's structural integrity or performance. Regular monthly maintenance tasks are routine checks, not significant alterations. Lastly, repairs that do not require certification typically fall outside the major repair category, as certification is a key aspect of any significant work performed on aircraft to maintain safety and compliance with aviation standards.