What are the Part-66 licence categories? In a Part-145 approved organisation, the different categories of Part-66 licences are: Divided into the following subcategories: Divided into B1.1 for turbine aeroplanes, Divided into the following ‘system ratings’: communication/navigation (com/nav), Maintenance on aircraft structure, power plant and mechanical and electrical systems; radio, Emergency Locator Transmitters (ELT) and transponder systems; and Divided into the following subcategories: L1C: composite sailplanes, C with respect to complex motor-powered aircraft and Maintenance on aircraft structure, power plant and mechanical and electrical systems; radio, Emergency Locator Transmitters (ELT) and transponder systems; and Divided into the following subcategories: L1C: composite sailplanes, See points 66.A.3 and 66.A.20 of Annex III (Part-66) to Regulation (EU) No 1321/2014 can be found on the Agency website https://www.easa.europa.eu/regulations#regulations-continuing-airworthi… or in the eRules https://www.easa.europa.eu/document-library/easy-access-rules/easy-acce…) Last updated 28/01/2021
Answer
LICENCE CATEGORY For certifying the release to service of work performed on aircraft: What: A Minor scheduled line maintenance and simple defect rectification Line Maintenance B1 Maintenance on aircraft structure, power plant and mechanical and electrical systems, avionic systems requiring simple tests to prove their serviceability and no troubleshooting
B1.2 for piston engine aeroplanes,
B1.3 for Turbine helicopter and
B1.4 for piston engine helicopterLine Maintenance B3 Maintenance on aeroplane structure, power plant and mechanical and electrical systems; and on avionics systems requiring only simple tests to prove their serviceability and not requiring troubleshooting limited to non-pressurized aeroplanes of 2 000 kg MTOM and below. Line Maintenance B2 Maintenance performed on avionic and electrical systems and electric and avionics tasks within powerplant and mechanical systems requiring only simple test and minor scheduled line maintenance and simple defect rectification Line Maintenance B2L The same as B2 but limited to the systems endorsed on the licence:
instruments,
auto flight,
surveillance,
airframe systems.Line Maintenance L
work on other avionics systems requiring simple tests to prove their serviceability
L1: sailplanes,
L2C: composite powered sailplanes and composite ELA1 aeroplanes,
L2: powered sailplanes and ELA1 aeroplanes,
L3H: hot-air balloons,
L3G: gas balloons,
L4H: hot-air airships,
L4G: ELA2 gas airships,
L5: gas airships other than ELA2.Line Maintenance C Base maintenance
C with respect to other than complex motor-powered aircraftLine Maintenance Support staff for: B1 Maintenance on aircraft structure, power plant and mechanical and electrical systems, avionic systems requiring simple tests to prove their serviceability and no troubleshooting (subdivided into B1.1 for turbine aeroplanes, B1.2 for piston engine aeroplanes, B1.3 for Turbine helicopter and B1.4 for piston engine helicopter) Base Maintenance B2 Maintenance on avionic and electrical systems and electric and avionics tasks within power plant and mechanical systems requiring only simple test and minor scheduled line maintenance and simple defect rectification Base Maintenance B2L The same as B2 but limited to the systems endorsed on the licence: B3 Maintenance on aeroplane structure, power plant and mechanical and electrical systems; and on avionics systems requiring only simple tests to prove their serviceability and not requiring troubleshooting limited to non-pressurized aeroplanes of 2 000 kg MTOM and below. Base Maintenance L
work on other avionics systems requiring simple tests to prove their serviceability
L1: sailplanes,
L2C: composite powered sailplanes and composite ELA1 aeroplanes,
L2: powered sailplanes and ELA1 aeroplanes,
L3H: hot-air balloons,
L3G: gas balloons,
L4H: hot-air airships,
L4G: ELA2 gas airships,
L5: gas airships other than ELA2.Base Maintenance
