Electrical Exam FAQ: EA Maintenance Questions Answered
The Electrical (EA) exam — also known as the Electronics exam — is the written test required for the AME License E rating. It covers the full breadth of aircraft electrical and avionics systems, from basic DC theory to advanced integrated flight management systems. This FAQ answers the most common questions about the exam format, content coverage, study approach, and how Sky Licence prepares you for success on the License E exam.
Sky Licence Team
AME exam preparation specialists — helping engineers earn their Transport Canada license since 2025
Overview of the Electrical (License E) Exam
The Electrical exam is the primary written test for the AME License E (Electronics) rating, one of the three main AME license categories in Canada alongside License M (Airframe & Powerplant) and License S (Structures). The exam ensures that every License E candidate has comprehensive knowledge of aircraft electrical power systems, avionics, communication and navigation equipment, instruments, and wiring maintenance standards. As modern aircraft become increasingly reliant on electrical and electronic systems — fly-by-wire flight controls, glass cockpits, integrated modular avionics, and more-electric aircraft architectures — the role of the License E AME has become more critical than ever.
The TP14038E syllabus for License E is organized into 10 chapters covering basic electricity (DC and AC theory, circuit analysis), aircraft batteries, DC power systems, AC power systems, power distribution and protection, wiring and connector practices, communication systems, navigation systems, aircraft instruments, and autoflight/flight management systems. The depth of coverage in each chapter is significant — for example, the communication systems chapter covers VHF, HF, audio systems, SELCAL, and satellite communications in enough detail that you could diagnose and repair each system.
One of the unique challenges of the Electrical exam is the breadth of technology it covers. You need to understand legacy systems still flying on older aircraft — such as carbon-pile voltage regulators and vacuum-gyro instruments — alongside cutting-edge technologies like solid-state power controllers, GPS-based navigation, fly-by-wire flight control computers, and integrated modular avionics (IMA). This technological span means that your study materials must cover both vintage and modern systems. Sky Licence addresses this by including questions that span the full technology spectrum, from basic electromechanical systems to advanced digital avionics.
Depth of Knowledge Required
The Electrical exam requires a significantly deeper level of electrical knowledge than the general electrical content found in the License M syllabus. For example, while a License M candidate might need to know that a generator produces DC power and has voltage regulator, a License E candidate needs to understand the generator's internal construction (field coils, armature, commutator, brushes), the voltage regulator's operating principles (carbon-pile or solid-state, sensing circuits, voltage adjustment), protection circuits (overvoltage, undervoltage, reverse current, differential protection), and troubleshooting procedures. This depth reflects the real-world responsibilities of a License E AME, who may be called upon to diagnose complex electrical system faults that a general License M engineer would not be expected to handle. Sky Licence tailors its question depth specifically to the License E standard, ensuring you are prepared for the level of detail expected on the exam.
Frequently Asked Questions
What is the Electrical (EA) exam and who needs to take it?
The Electrical (EA) exam — also referred to as the Electronics exam or License E exam — is the written test required for the AME License E (Electronics) rating. It covers aircraft electrical power systems, avionics, communication and navigation systems, instruments, autoflight systems, and wiring maintenance. The TP14038E syllabus organizes this material into 10 chapters covering everything from basic DC/AC theory to advanced integrated avionics systems. While License E is a separate rating from License M, many AMEs hold both. Sky Licence covers all 10 electrical/electronics chapters with over 600 practice questions, making it the most comprehensive License E preparation tool available.
How many questions are on the Electrical exam and what is the format?
The Electrical exam follows the standard Transport Canada AME written exam format: 50 multiple-choice questions with a 90-minute time limit and a 70% pass mark (35 out of 50 correct). The exam is computer-based at approved testing centers. Questions cover DC and AC electrical theory, aircraft electrical power generation and distribution systems, batteries, avionics systems, communications equipment, navigation aids, instruments, autoflight systems, and wiring/connector maintenance. The questions range from theoretical (Ohm's law calculations, circuit analysis) to practical (troubleshooting a generator failure, identifying correct wiring practices). Sky Licence provides timed practice exams that replicate the exact exam format and difficulty distribution.
What are the most important topics on the Electrical exam?
Based on the TP14038E syllabus and exam blueprints, the most heavily tested topics include: DC and AC electrical theory (Ohm's law, Kirchhoff's laws, AC circuit theory, transformers, rectifiers); aircraft batteries (lead-acid, nickel-cadmium, lithium-ion; charging methods, servicing, safety); DC power systems (generators, voltage regulators, parallel operation, load sharing); AC power systems (alternators, constant-speed drives, integrated drive generators, APU generators); bus systems (essential, non-essential, emergency, tie bus, split bus); power distribution (circuit breakers, fuses, contactors, relays, solid-state power controllers); wiring practices (wire types, sizes, identification, shielding, bonding, crimping, soldering); communication systems (VHF/HF comm, audio panels, intercoms, SELCAL); navigation systems (VOR, ILS, DME, ADF, GPS, RNAV); and instruments (pitot-static, gyroscopic, electronic flight instrument systems).
How does the License E exam differ from License M technical exams?
The License E (Electrical/Electronics) exam is fundamentally different from the License M (Airframe & Powerplant) technical exams. While License M focuses on mechanical systems — structures, hydraulics, landing gear, engines — License E focuses entirely on electrical and electronic systems. The depth of electrical knowledge required for License E far exceeds what is tested on the License M airframe or powerplant exams. For example, a License M candidate only needs a basic understanding of how a generator works, while a License E candidate needs to understand generator construction, voltage regulation principles, parallel operation, protection circuits, and troubleshooting procedures in detail. If you are pursuing License E, you need dedicated study of electronics material that goes well beyond the general electrical content in the License M syllabus.
Do I need a strong math background for the Electrical exam?
A solid understanding of basic electrical math is essential for the Electrical exam. You should be comfortable with Ohm's law calculations (V = IR), power calculations (P = VI), series and parallel circuit analysis, Kirchhoff's current and voltage laws, and basic AC theory including impedance, reactance, and phase angles. For more advanced topics, you may encounter calculations involving transformer ratios, rectifier output voltages, filter cutoff frequencies, and instrument errors. That said, the math on the exam is applied — you need to use it to solve real electrical problems, not just perform abstract calculations. Sky Licence includes formula references and step-by-step calculation explanations in its practice questions to help you build confidence with electrical math.
What types of electrical systems are covered for aircraft?
The Electrical exam covers both DC and AC aircraft electrical systems comprehensively. DC systems include generators (shunt-wound, compound-wound), voltage regulators (carbon-pile, solid-state), overvoltage and undervoltage protection, reverse current cutout relays, and load sharing between parallel generators. AC systems include alternators, brushless generators, integrated drive generators (IDGs), constant-speed drives (CSDs), AC bus systems (115V AC, 26V AC, 400 Hz), and AC power distribution. Modern aircraft systems include variable-frequency generators (used on Boeing 787 and Airbus A350), solid-state power controllers (SSPCs), electrical load management systems, and ram air turbine (RAT) emergency systems. The exam also covers emergency power systems including batteries, auxiliary power units (APUs), and external/ground power systems.
What avionics and communication systems are on the exam?
Avionics systems form a major portion of the Electrical exam. Communication systems covered include VHF communication transceivers (118–137 MHz), HF communication systems (2–30 MHz) for long-range operations, audio integrating systems (audio panels, intercoms, passenger address), and SELCAL (selective calling). Navigation systems include VOR (VHF omnidirectional range), ILS (instrument landing system — localizer, glide slope, markers), DME (distance measuring equipment), ADF (automatic direction finder), GPS (global positioning system), and RNAV (area navigation / FMS). You should understand the operating principles, frequency ranges, accuracy, and limitations of each system, as well as how they interface with the flight crew through displays and controls. Advanced systems like SBAS (WAAS), GBAS, and ADS-B are increasingly appearing on the exam.
How much wiring and connector maintenance is on the exam?
Wiring and connector maintenance is a significant topic on the Electrical exam, reflecting its importance in real-world aircraft maintenance. You need to know wire types (MIL-W-22759, MIL-W-81381), wire gauges (American Wire Gauge system), wire identification (part number interpretation, wire marking), and the proper use of shielding, bonding, and grounding. Connector types (circular, rectangular, coaxial, ARINC, USB/ethernet in modern aircraft) and their maintenance — including pin removal/insertion, crimp tool selection, contact inspection, and sealing — are tested. You should understand soldering techniques and standards (NASA/IPC J-STD-001), crimp termination standards, and wire bundle installation practices (clamping, routing, separation from fluid lines, bend radius requirements). Wire fault troubleshooting — including opens, shorts, high resistance, and intermittent faults — is also a common exam topic.
What types of batteries are covered on the exam?
Aircraft batteries are a dedicated topic on the Electrical exam. You need to understand lead-acid batteries (construction, electrolyte, specific gravity, charging characteristics, servicing requirements, safety concerns), nickel-cadmium (Ni-Cd) batteries (construction, thermal runaway risk, memory effect, deep cycling, servicing), and lithium-ion batteries (increasingly common on modern aircraft like the Boeing 787 and Airbus A350 — construction, battery management systems, thermal runaway, containment requirements). For each battery type, you should know the charging methods (constant voltage, constant current), charging limits, temperature effects, capacity testing procedures, storage requirements, and safety precautions. The thermal runaway phenomenon in Ni-Cd batteries — its causes, prevention, and emergency procedures — is a frequent exam question.
How should I study for the Electrical exam?
The Electrical exam requires a structured approach because of the logical progression from basic to advanced topics. Start with DC and AC theory fundamentals — without a solid grasp of Ohm's law, circuit analysis, and basic AC principles, you will struggle with later topics. Then move to aircraft electrical power systems (generation, distribution, protection). Follow with instruments and avionics (communication, navigation, autoflight). Finally, cover wiring practices and troubleshooting. Throughout your study, practice calculations regularly — the math on the exam is not difficult, but it requires accuracy and speed. Sky Licence follows this progressive structure with chapter-level adaptive difficulty and topic-specific performance tracking, so you can identify where your foundation needs strengthening before moving to advanced material.
Can I take the Electrical exam if I am pursuing License M?
The Electrical exam is specifically required for the License E (Electronics) rating. If you are pursuing only License M (Airframe & Powerplant), you do not need to take the dedicated Electrical exam. However, many AMEs choose to pursue both ratings, as License E is considered a valuable endorsement that opens additional career opportunities. If you hold License M and want to add License E, you would need to pass the Electrical exam and meet the experience requirements for the E rating. Sky Licence supports multi-license candidates by providing separate modules for License M and License E content, so you can study for both on a single platform.
How does Sky Licence help me prepare for the Electrical exam?
Sky Licence offers a comprehensive Electrical exam module with over 600 practice questions covering all 10 TP14038E electronics chapters. Key features include AI-powered adaptive difficulty that adjusts to your performance across each topic area — from basic DC theory to advanced integrated avionics. Every answer choice includes a detailed explanation explaining why it is correct or incorrect. Timed mock exams replicate the real 90-minute/50-question format. Performance analytics track your accuracy by chapter and topic, so you can see exactly where you need to focus. Whether you are studying for License E as a primary rating or adding it to an existing License M, Sky Licence adapts to your level. Create a free account at Sky Licence to start practicing today.
For more about the AME licensing process and other exam types, check out our Standards exam FAQ and Human Factors exam FAQ. Visit the main Sky Licence FAQ for platform-related questions.
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