B1 vs B2 Licence: Which Aircraft Maintenance Path Should You Choose?

B1 or B2 is one of the earliest and most important choices an aircraft maintenance student makes. Both are respected certifying licences — they simply point at different parts of the aircraft.

Two licences, two specialisations

Under both the DGCA CAR-66 and EASA Part-66 frameworks, the Category B licence is split into B1 and B2. Broadly, B1 is the mechanical stream and B2 is the avionics stream. Both allow the holder to certify maintenance and issue a release to service, but within different technical boundaries.

What B1 covers

A B1 engineer works across the aircraft’s structure, powerplant, and mechanical and electrical systems. B1 is further divided by technology — turbine and piston, aeroplane and helicopter — and its holders certify airframe, engine and general electrical tasks. If you enjoy engines, hydraulics, landing gear and hands-on structural work, B1 is your natural home.

What B2 covers

A B2 engineer specialises in avionics and electrical systems: instruments, autoflight, communications and navigation, and the increasingly software-driven systems at the heart of modern aircraft. As aircraft become more electric and more digital, B2 skills are in growing demand, and avionics specialists are often in shorter supply.

How the paths differ in practice

The two licences shape different daily work and different career flavours. B1 engineers tend to touch a broader range of physical systems; B2 engineers go deeper into electronics and troubleshooting. Both are essential — a line maintenance team typically needs both certifying capabilities to release an aircraft.

Can you hold both?

Yes. Many engineers begin with one category and later add the other, and holding both B1 and B2 makes you exceptionally versatile and valuable. It is a longer road, requiring the knowledge modules and experience for each, but it maximises the range of tasks you can certify.

How to choose

Follow your aptitude and interest. If you gravitate to mechanical systems and structures, start with B1; if electronics, wiring and digital systems fascinate you, start with B2. Consider local demand too — talk to working engineers and MROs about which category they struggle most to hire. Whichever you choose, the fundamentals in the shared modules carry across both.

There is no wrong answer — only the path that best fits how you like to work and where the demand is strongest.