Understanding the Three AME Specialty Ratings

Transport Canada's AME licensing system, governed by CAR Part V and outlined in the TP14038E syllabus, recognizes three distinct specialty ratings. Each rating authorizes the holder to certify maintenance in a specific domain of aircraft maintenance. Unlike the M1 and M2 sub-ratings (which define the weight and complexity of aircraft you can work on), the E, S, and M ratings define the type of work you are qualified to certify.

It is also possible — and increasingly common — to hold multiple ratings. Many experienced AMEs eventually obtain two or all three ratings to maximize their career flexibility and earning potential. However, most candidates start with a single rating and add others as their career progresses.

AME M Rating (Airframe/Powerplant)

The M rating is the most common and versatile AME specialty. It covers the airframe (the aircraft's physical structure and mechanical systems) and the powerplant (engines and related systems). M-rated engineers are the general practitioners of aircraft maintenance — they work on everything from landing gear and flight controls to engines and fuel systems.

What M-Rated AMEs Do

Perform scheduled inspections (50-hour, 100-hour, annual, etc.) on airframes and engines
Troubleshoot and repair mechanical systems including landing gear, brakes, flight controls, and hydraulic systems
Overhaul and repair reciprocating and turbine engines
Conduct structural repairs on fuselages, wings, and control surfaces
Certify maintenance releases for airframe and powerplant work

Exams Required for M Rating

To obtain an M rating, you must pass the CARS exam, Standards exam, Airframe exam, Powerplant exam, and Electrical exam — all five written exams. This is the most comprehensive exam requirement of any rating, reflecting the broad scope of the M rating's responsibilities.

Career Outlook and Salary

M-rated AMEs are in high demand across all sectors of aviation. General aviation, airlines, charter operators, and MROs all need M-rated engineers. Entry-level salaries range from $45,000 to $55,000 CAD, with experienced M-rated engineers earning $70,000 to $95,000. M2-rated engineers (qualified on turbine aircraft) at major airlines can earn $100,000 or more.

AME E Rating (Electronics)

The E rating focuses on aircraft electrical and electronic systems, including avionics, communication systems, navigation equipment, autopilots, and instrument systems. E-rated engineers are the specialists who keep modern aircraft's increasingly complex electronic systems functioning safely.

What E-Rated AMEs Do

Install, test, and troubleshoot avionics equipment (VHF, VOR, ILS, ADF, DME, transponders, weather radar)
Maintain autopilot and flight management systems
Work on instrument systems including pitot-static, gyroscopic, and electronic flight instrument systems (EFIS)
Troubleshoot complex electrical and electronic faults using schematic diagrams and test equipment
Perform software updates and configuration management on avionics systems

Exams Required for E Rating

The E rating requires passing three written exams: the CARS exam, the Standards exam, and the Electrical exam. Because E-rated engineers do not certify airframe or powerplant work, they are not required to take the Airframe or Powerplant exams. However, the Electrical exam for the E rating is more in-depth than the electrical component of the M rating exam.

Career Outlook and Salary

With the rapid advancement of avionics technology — including glass cockpits, satellite communications, and advanced navigation systems — demand for E-rated AMEs is growing faster than any other specialty. Salaries are competitive with M-rated engineers, typically ranging from $50,000 to $90,000 CAD depending on experience and employer. E-rated engineers with expertise in modern integrated avionics systems (such as Garmin G1000 or Honeywell Primus Epic) are particularly well-compensated.

AME S Rating (Structures)

The S rating specializes in aircraft structural maintenance and repair. S-rated engineers are experts in sheet metal work, composite materials, welding, and structural inspection. They are the professionals who repair and modify the physical airframe — from fixing corrosion damage on a Cessna 172 to performing major structural repairs on a Boeing 787's composite fuselage.

What S-Rated AMEs Do

Perform structural repairs on fuselage skins, wing panels, stringers, ribs, and bulkheads
Work with both metallic (aluminum, steel, titanium) and composite (carbon fibre, fibreglass) materials
Conduct corrosion assessment and treatment
Perform NDT (non-destructive testing) including dye penetrant, eddy current, ultrasonic, and radiographic inspection
Execute approved modifications and Supplemental Type Certificate (STC) installations

Exams Required for S Rating

The S rating requires passing the CARS exam, Standards exam, and Airframe exam. The Airframe exam for the S rating places heavier emphasis on structural topics — including repair techniques, materials science, and NDT methods — than the M rating's Airframe exam.

Career Outlook and Salary

S-rated AMEs are critical in MRO facilities, especially those specializing in heavy maintenance and structural repairs. Salaries are generally comparable to M and E ratings, ranging from $45,000 to $85,000 CAD. S-rated engineers with advanced composite repair skills are increasingly in demand as modern aircraft use more composite materials. The growing number of composite-intensive aircraft like the Boeing 787 and Airbus A350 makes this a future-proof specialty.

Side-by-Side Comparison

Factor	M Rating	E Rating	S Rating
Focus Area	Airframe + Powerplant	Electronics / Avionics	Structures / Sheet Metal
Written Exams	5 exams (all)	3 exams	3 exams
Experience Required	48 months (min)	48 months (min)	48 months (min)
Salary Range	$45K–$100K+	$50K–$90K	$45K–$85K
Key Skills	Mechanical, broad	Electrical, analytical	Precision, materials
Growing Demand	Steady	High growth	Strong (composites)

How to Choose the Right Rating for You

Your choice of rating should be guided by three factors: your natural aptitudes, your career goals, and the opportunities available in your region.

Choose M Rating If You

Enjoy working with your hands on mechanical systems — engines, landing gear, flight controls
Want the broadest range of job opportunities across all aviation sectors
Prefer variety in your daily work — no two days are the same for an M-rated AME
Are willing to study for all five written exams (the most demanding preparation)

Choose E Rating If You

Have a strong interest in electronics, circuits, and computer systems
Enjoy troubleshooting complex faults using schematics and diagnostic tools
Want to specialize in the fastest-growing area of aviation maintenance
Prefer working with smaller, precision components rather than large mechanical assemblies

Choose S Rating If You

Excel at precision work and take pride in craftsmanship — sheet metal repairs require skill and patience
Are interested in materials science, including composites and advanced alloys
Want to work in heavy maintenance and structural modification facilities
Enjoy seeing tangible results — a structurally repaired aircraft is a visible accomplishment

Can You Hold Multiple Ratings?

Yes. Transport Canada allows AMEs to hold multiple specialty ratings. Many experienced engineers eventually obtain two or even all three ratings. Holding multiple ratings increases your employability, allows you to certify a wider range of work, and typically commands a salary premium.

The typical path is to obtain one rating first — usually M, as it is the most versatile — gain experience, and then add additional ratings by taking the required exams and meeting the experience requirements. Each additional rating requires passing the relevant written exams and demonstrating practical experience in that specialty.

Prepare for Your Rating Exams with Sky Licence

Whatever rating you choose, Sky Licence has you covered. Our AI-powered platform provides targeted practice for all Transport Canada AME written exams, organized by rating and aligned with the TP14038E syllabus:

For M rating candidates — All five exams with full syllabus coverage
For E rating candidates — CARS, Standards, and Electrical exams with in-depth avionics and electronics content
For S rating candidates — CARS, Standards, and Airframe exams with emphasis on structural topics

Start preparing for your rating exams with Sky Licence →