B1 vs B2 Aircraft Maintenance Engineer: Difference, Compensation and Career Paths
Aircraft maintenance engineers play a critical role in keeping aircraft safe, compliant and operational. As airlines, MRO organisations and aircraft operators continue to compete for experienced technical professionals, understanding the different aircraft maintenance licence categories is increasingly important for anyone planning a career in aviation engineering.
Two of the most recognised EASA Part-66 categories are B1 and B2 aircraft maintenance licences.
Although both roles are involved in aircraft maintenance and can lead to strong international career opportunities, their areas of responsibility are different. Understanding the distinction between B1 and B2 can help aspiring engineers choose the right career path and help experienced engineers identify the opportunities that best match their qualifications.
What Is a B1 Aircraft Maintenance Engineer?
A B1 aircraft maintenance engineer focuses primarily on the mechanical and physical systems of an aircraft.
Under EASA Part-66, B1 privileges cover areas including aircraft structure, powerplant, mechanical and electrical systems, as well as certain avionics work involving simple tests. B1 licences are divided into different subcategories depending on the aircraft and propulsion type.
In practical terms, a B1 engineer may work with:
- Aircraft engines and powerplants
- Airframe structures
- Landing gear
- Flight controls
- Hydraulic systems
- Pneumatic systems
- Mechanical systems
- Electrical systems
- Certain avionics systems where only simple testing is required
B1 engineers are therefore closely associated with the mechanical and structural side of aircraft maintenance.
What Is a B2 Aircraft Maintenance Engineer?
A B2 aircraft maintenance engineer specialises in aircraft avionics and electrical systems.
EASA defines B2 privileges around maintenance of avionics and electrical systems, including certain avionics and electrical tasks within mechanical and powerplant systems.
A B2 engineer may work on systems such as:
- Communication systems
- Navigation systems
- Flight instruments
- Autopilot systems
- Aircraft computers
- Radar and surveillance systems
- Electrical systems
- Avionics interfaces and associated equipment
As modern aircraft become increasingly dependent on sophisticated electronics, software and integrated digital systems, avionics expertise has become an increasingly important part of aircraft maintenance.
B1 vs B2: What Is the Difference?
The simplest way to understand the difference is to think of mechanical systems versus avionics systems.
A B1 engineer is primarily responsible for the aircraft's mechanical, structural and propulsion-related systems, while a B2 engineer specialises in avionics and electrical systems.
Both are highly skilled technical professionals and both can play an essential role within a Part-145 maintenance organisation. The right choice depends largely on your technical interests, education, experience and long-term career goals.
What Are the Requirements to Become a B1 or B2 Engineer?
Obtaining an EASA Part-66 Aircraft Maintenance Licence involves meeting the relevant knowledge and experience requirements.
For a B1 or B2 licence, EASA states that applicants need to demonstrate basic knowledge and basic experience. The precise requirements can vary depending on factors such as the licence category, previous technical education and training.
The process generally includes:
1. Build the required technical knowledge
Candidates must demonstrate knowledge across the relevant Part-66 modules.
Training may be completed through an approved maintenance training organisation or through other routes recognised under the applicable regulatory framework.
2. Gain practical maintenance experience
Practical experience is an important part of progressing toward an aircraft maintenance licence. The amount and type of experience required depends on the individual's circumstances and licence category.
3. Complete the relevant examinations
Candidates must successfully demonstrate the required technical knowledge through the applicable Part-66 examinations.
4. Obtain the Aircraft Maintenance Licence
Once the applicable requirements have been met, the applicant can apply for the relevant Part-66 licence through the competent authority.
5. Add aircraft type ratings
A basic Part-66 licence is only part of the career journey for many engineers working on commercial aircraft.
Engineers can add aircraft type ratings to their licence by completing the relevant type training and, where required, practical training and on-the-job training.
For B1 and B2 engineers, EASA requires OJT for the first aircraft type in a licence category or subcategory, subject to the applicable regulatory provisions.
B1 and B2 Aircraft Type Ratings
Aircraft type ratings are particularly important for engineers seeking commercial airline and MRO opportunities.
For example, an engineer may pursue experience and qualifications related to aircraft such as:
- Airbus A320 family
- Airbus A330
- Airbus A350
- Boeing 737
- Boeing 777
- Boeing 787
The specific training and endorsement requirements depend on the aircraft type and the engineer's existing licence and ratings.
For larger aircraft, EASA requirements include theoretical and practical type training, with OJT applicable to the first type rating in the relevant licence category or subcategory.
This means that gaining a licence is not necessarily the end goal. Building relevant aircraft experience and adding strategically valuable type ratings can be an important part of developing a successful aviation engineering career.
B1 vs B2 Compensation: What Can Engineers Expect?
There is no single compensation figure for B1 or B2 aircraft maintenance engineers.
Pay can vary considerably depending on:
- Country
- Airline or MRO
- Aircraft type
- Licence category
- Type ratings
- Previous experience
- Line or base maintenance
- Contract structure
- Working pattern
- Overtime and allowances
- Location of the role
Engineers with valuable aircraft type ratings, strong recent experience and the right certification privileges may access different opportunities from engineers earlier in their careers.
For this reason, compensation should be evaluated alongside the complete hiring package, including allowances, accommodation, travel arrangements, working patterns, training and contract terms.
Which Has Better Career Opportunities: B1 or B2?
There is no universal answer.
Both B1 and B2 engineers can build long-term careers across airlines, MRO organisations, aircraft operators and aviation service providers.
Your best option will depend on your technical background and the type of work you enjoy.
A B1 career may be particularly attractive if you are interested in: Aircraft mechanics, engines, structures, flight controls and mechanical systems.
A B2 career may be more suitable if you are interested in: Avionics, electronics, aircraft computers, navigation, communication and electrical systems.
For professionals already working in aviation, the decision may instead come down to which additional licence category or aircraft rating would strengthen their existing qualifications.
Line Maintenance vs Base Maintenance
B1 and B2 engineers can work across different maintenance environments.
Line maintenance takes place around an aircraft's normal operation and often involves inspections, troubleshooting, defect rectification and maintenance tasks between flights.
Base maintenance involves more extensive scheduled maintenance and can require aircraft to remain in a maintenance facility for longer periods.
The exact responsibilities of an engineer will depend on the organisation, aircraft type, authorisations and scope of work.
This is one reason that two engineers with the same basic licence category can have quite different day-to-day roles.
What Skills Do Employers Look For in B1 and B2 Engineers?
Regulatory qualifications are essential, but employers also look closely at practical experience and professional capabilities.
Commonly valued qualities include:
Aircraft type experience
Relevant experience on the aircraft operated by an airline or MRO can be a major advantage.
Recent maintenance experience
Employers need engineers who can demonstrate current, relevant experience.
Technical knowledge
Strong understanding of aircraft systems and maintenance procedures is fundamental.
Troubleshooting ability
The ability to identify and resolve technical issues efficiently is particularly valuable in operational environments.
Attention to detail
Aircraft maintenance requires accuracy, discipline and strict adherence to procedures.
Communication skills
Engineers work closely with other maintenance professionals, flight crews, engineers and operational teams.
Regulatory awareness
Understanding applicable aviation regulations and maintenance procedures is essential in a highly regulated industry.
B1 or B2: Which Career Path Is Right for You?
Choosing between B1 and B2 should start with your technical strengths and career objectives.
If you are most interested in engines, mechanical systems, structures and aircraft maintenance from a physical systems perspective, B1 may be the natural fit.
If you are more interested in avionics, electronics, communication, navigation and aircraft electrical systems, B2 may be the stronger choice.
For experienced engineers, however, the question may not be B1 or B2. Depending on your qualifications and career goals, developing competencies across both areas can potentially broaden your opportunities.
Building an International Aircraft Engineering Career
One of the major advantages of aircraft maintenance is the international nature of the aviation industry.
Qualified engineers can find opportunities across different markets, particularly when they combine recognised licensing, relevant aircraft type ratings and recent practical experience.
International opportunities can also involve different hiring models, including permanent positions, contract assignments and project-based work.
Understanding the licensing, documentation, work eligibility and hiring requirements of the market you are targeting is therefore an important part of planning an international aviation career.
Find Your Next Aircraft Engineering Opportunity
The aviation industry continues to rely on skilled maintenance professionals to support safe and efficient aircraft operations.
Whether you are an experienced B1 or B2 engineer looking for your next role, or you are planning the next stage of your aviation career, understanding your licence, type ratings and experience can help you identify opportunities that match your qualifications.
At MHC Aviation, we support aviation professionals and organisations across international recruitment and workforce solutions.
Explore current aircraft engineering opportunities and discover where your experience could take your career next.
Frequently Asked Questions
Is B1 better than B2?
Neither licence is universally better. B1 and B2 cover different areas of aircraft maintenance, so the best option depends on your technical background and career goals.
Can a B1 engineer work on avionics?
B1 privileges include certain avionics-related work involving simple tests, but the scope is different from the specialist avionics privileges associated with a B2 licence.
Can a B2 engineer work on mechanical systems?
B2 privileges focus primarily on avionics and electrical systems, with specific privileges for certain avionics and electrical tasks within other aircraft systems.
Do B1 and B2 engineers need type ratings?
For engineers seeking certification privileges on specific aircraft types, the relevant type-rating requirements apply. EASA specifies type training and, for the first type rating in the applicable B1/B2 category or subcategory, OJT subject to the applicable rules.
Can a B1 engineer become B2 qualified?
Additional licence categories can be pursued by meeting the applicable Part-66 knowledge and experience requirements. The exact pathway depends on the engineer's existing licence, qualifications and experience.
Final Thoughts
B1 and B2 aircraft maintenance engineers both have an important role in modern aviation, but they specialise in different areas of aircraft maintenance.
Understanding the difference between the two categories is an important first step for anyone looking to enter or progress their careers within the aircraft maintenance industry.
With the right combination of licensing, aircraft type ratings, practical experience and technical expertise, both B1 and B2 engineers can build rewarding careers and access opportunities across the international aviation market.
MHC Aviation works with aviation professionals and organisations to connect the right people with the right opportunities across the industry.
