Part 66 refers to a key aspect of the European Aviation Safety Agency (EASA) Regulatory System, focusing on the licensing of aircraft maintenance engineers. The licenses issued under this framework are categorized based on specific competencies. All licenses are type-rated and are only valid when authorized by a Part 145 Maintenance Organisation. These licenses allow engineers to issue a Certificate of Release to Service (CRS), confirming that maintenance work meets safety standards.
Before certification, other personnel can perform maintenance tasks within an approved organization, as long as they adhere to the established systems. There are different categories of licenses: Category B1 allows certification for airframe structures, powerplants, and mechanical electrical systems. In contrast, Category B2 covers avionics and avionics-based electrical systems.
Category C encompasses the entire aircraft, allowing for CRS certification in base maintenance, provided the aircraft is fully integrated within a Part 145 organization. It’s important to note that the engineer licensing system used by the FAA in the USA differs significantly and does not rely on aircraft type ratings.
