Which EASA part 66 license category allows a person to act as certifying staff for base maintenance?

The EASA Part 66 licensing framework is designed to ensure that individuals who perform maintenance on aircraft have the appropriate knowledge, skills, and qualifications. Among the different categories of licenses defined by EASA, Category C is specifically tailored for personnel who are empowered to perform certifying staff roles in base maintenance.

Base maintenance refers to more extensive repair and overhaul activities performed at maintenance facilities, typically involving tasks that require thorough inspection and the ability to certify the airworthiness of an aircraft. A Category C license holder has demonstrated comprehensive knowledge of aircraft systems and is authorized to release the aircraft into service once maintenance is completed. This license signifies that the individual possesses the qualifications necessary to ensure comprehensive maintenance checks are carried out effectively, aligning with regulatory standards.

In contrast, the other categories have distinct roles. For instance, Category A is focused on line maintenance, which involves performing simpler tasks that can be conducted quickly and does not usually include certifying the aircraft for return to service. Categories B and D have different scopes and do not encompass the roles required for base maintenance certification. Therefore, the identification of Category C as the correct answer reflects its pivotal role in ensuring proper technical oversight and safety in base maintenance operations.