Aircraft Engineer Licence in Australia: CASA Part 66 Explained
If you are searching for how an aircraft engineer licence in Australia works, start with the right premise.
A licence is a CASA regulatory outcome under Part 66. It is not simply a course enrolment, not simply a diploma, and not simply a set of exams.
At Sigma Aerospace College, we explain this directly because a lot of engineers lose time at the first step. They hear “get your licence” and then start chasing isolated pieces of the pathway without understanding how the full outcome is built. In practice, the path is layered. There is a trade foundation, there are licence-relevant units of competency, there are CASA knowledge examinations, there is practical maintenance experience on operating aircraft, and in many cases there is later aircraft type training on top.
What CASR Part 66 actually covers
Part 66 is the licensing framework used by CASA for aircraft maintenance engineers.
The system is built around licence categories and subcategories, not around one generic “engineer licence”. That is why the first real question is not whether you want a licence. It is which licence category you are actually targeting.
In plain terms, Category A is the line maintenance certifying mechanic pathway. Category B1 is the mechanical certifying engineer pathway. Category B2 is the avionics certifying engineer pathway. Category C is the base maintenance certifying engineer pathway for large aircraft. Each category carries different privileges, different training requirements and different experience requirements. Our Aircraft Engineer Licence (CASA) page breaks those pathways down in practical terms.
What people usually get wrong
The most common mistake is assuming the qualification is the licence. It is not.
A Certificate IV in Aeroskills is typically the trade foundation. A Diploma of Aeroskills is often the qualification packaging used for higher-level B-category progression. But CASA does not issue a licence because you hold a testamur. CASA looks at the actual Part 66 requirements.
The second common mistake is assuming the exams are the whole pathway. They are not. The CASA Part 66 exams matter, but they sit inside a wider pathway that includes MEA units, practical evidence, and the maintenance experience required for the outcome.
The third common mistake is ignoring aircraft type ratings. The initial licence and the aircraft type rating are not the same thing. If the aircraft is type-rated and you want to certify maintenance under your Part 66 privileges on that aircraft, you will usually need the relevant type endorsement. That is why Sigma also delivers aircraft type training courses for common Australian fleet types.
How the standard path is usually built
For most engineers, the cleanest pathway starts with the trade base: the Cert IV.
That usually means the right Aeroskills stream, often through an apprenticeship or traineeship. From there, the engineer moves into the licence-relevant units and knowledge requirements for the specific category being targeted. After that, the CASA exams are completed, the practical experience requirement is met, and the licence application is prepared properly.
That sequence matters. It is much more efficient to plan the pathway from the target licence backwards than to accumulate random training and hope it all lines up later.
How Sigma approaches the licence pathway
At Sigma Aerospace College, we do not treat licensing as a generic classroom product.
We work backwards from the intended outcome. If you are starting from zero, we look at the right trade entry point. If you are already employed in maintenance, we look at the most direct compliant training path. However, if you are experienced and already hold prior qualifications or evidence, we use our RPL and gap process to identify what can be recognised and what remains outstanding.
That matters because different engineers arrive with different starting points. An apprentice, a current AME, a Defence engineer, and an overseas licence holder do not need the same delivery model. What they do need is a pathway that stays aligned to the actual Part 66 outcome.
Before you choose a course, choose the category
If your goal is licensing, the better question is not “what course should I do first?” The better question is “what certification privilege am I actually trying to get to?”
Once that is clear, the training decisions make a lot more sense.
If you are targeting mechanical fixed-wing turbine work, that points to a different pathway than piston general aviation, rotary mechanical, or fixed-wing avionics. This is one reason Sigma publishes separate B1.1, B1.2, B1.3, B1.4 and B2 pathways rather than one vague “licence course”.
The practical point
If you are serious about an aircraft engineer licence, do not build the path from guesswork.
Start with the correct category. Build the trade base properly. Complete the right MEA units. Sit the right exams. Record the right experience. Then apply to CASA with a pathway that actually stands up.
That is how Sigma treats licensing. Not as a slogan. As a structured regulatory outcome.