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Category B licences are aimed at line maintenance. They can also be used within base maintenance, in inspection or supervisory roles. Category B licences are separated into Mechanical and Avionics disciplines, identified and B1 and B2 respectively.

The following are the sub-categories within Licences B1 and B2:

• Category B1.1 – Turbine Engine Aeroplanes
• Category B1.2 – Piston Engine Aeroplanes
• Category B1.3 – Turbine Engine Helicopters
• Category B1.4 – Piston Engine Helicopters
• Category B1.5 – reserved for airships (to be developed)
• Category B2 – Line Maintenance Certifying Technician (Avionics)

To be eligible for a licence, an individual must have completed the relevant modular examinations and have a prescribed period of aircraft maintenance experience.

A minimum of Grade C GCSE’s or equivalent in maths and a science subject is required. Practical maintenance experience will also be a benefit, in both assisting understanding and ensuring all experience requirements will be fulfilled within the specified 5 year period.

Once passed, the modules are held in credit for 5 years. All experience and relevant examinations must be gained within this time period, otherwise module examinations will have to be retaken.

Experience required:

• 5 years – where no previous experience of formal training has been achieved
• 4 years – where the applicant has already qualified as a ‘skilled worker’ in another profession
• 2 years – where the applicant has successfully completed a JAR-147 approved cost of basic training at a category B1 or B2 level

The wider responsibilities of the Category B technician requires a more detailed knowledge than for Category A and, hence, a longer period of experience.

Category B1 is mechanically oriented and covers aircraft structure, airframe systems, engines and propellers, or rotors, as appropriate. Category B1 licence holder will be also be able to certify all electrical work, including power and distribution systems and control and indication systems.

Category B2 is avionic based and confers privileges similar to those of the mechanical technician to cover electrical power and distribution and control and indication systems associated with avionic systems.