This category is further divided into 2 streams
- B1 Mechanical
Aircraft Maintenance License shall permit the holder to issue certificates of release to service following maintenance, including aircraft structure, powerplant and mechanical and electrical systems. Replacement of avionic line replaceable units, requiring simple tests to prove their serviceability, shall also be included in the privileges. Category B1 shall automatically include the appropriate A subcategory.
Categories A and B1 are subdivided into subcategories relative to combinations of aero planes, helicopters, turbine and piston engines. The subcategories are:
- A1 and B1.1 Aero planes Turbine
- A2 and B1.2 Aero planes Piston
- A3 and B1.3 Helicopters Turbine
- A4 and B1.4 Helicopters Piston
- B2 Avionics
Aircraft Maintenance License shall permit the holder to issue certificates of release to service following maintenance on avionic and electrical systems.