- The CAET exam has 100 multiple-choice questions, a 90-minute limit, and a 70% passing score.
- AEA's Level 1 CAET covers eight domains, from wiring and hardware to digital databus systems.
- Virtual proctoring via GMetrix costs $119; an approved physical proctor drops the fee to $109.
- Your purchase covers up to three attempts within 90 days - plan your prep around that window.
What the CAET Exam Actually Tests
The Certified Aircraft Electronics Technician (CAET) credential is administered by the Aircraft Electronics Association (AEA) and delivered through the Unmanned Safety Institute (USI). This guide focuses specifically on the base Level 1 CAET assessment - not the AET upgrade path and not the separate CAET-Advanced assessment. If you're still sorting out what the letters mean or how the program is structured, our overview at What Is CAET? and the deeper breakdown in CAET Certification are good starting points before you dive into study mode.
There are no formal prerequisites to sit for the Level 1 exam, which makes it accessible to entry-level bench technicians, avionics apprentices, and career-changers alike. For a full rundown of eligibility mechanics, see CAET Requirements 2026. Once you're eligible, the exam itself is straightforward in format: 100 multiple-choice questions, a 90-minute time limit, and a passing score of 70%. That's roughly 54 seconds per question if you use every minute, though most well-prepared candidates move faster on the questions they know cold and save time for wiring diagrams and calculation-based items.
The Eight CAET Domains Explained
AEA organizes the CAET exam into eight official topic areas. Each one pulls from real bench and line-maintenance tasks rather than abstract theory, which is why rote memorization alone tends to fail candidates. For a domain-by-domain deep dive with subtopic lists, read CAET Exam Domains 2026: Complete Guide to All 8 Content Areas. Here's a condensed view of what each domain demands.
Domain 1: Maintenance Procedures & Regulatory Requirements
Covers documentation, work orders, and the regulatory framework technicians operate under in maintenance environments.
- Know how maintenance records and sign-offs tie to airworthiness
Domain 2: Basic Electrical Theory & Systems
Foundational Ohm's Law, circuit analysis, AC/DC behavior, and component function - the bedrock the rest of the exam builds on.
- Practice series and parallel circuit calculations until they're automatic
Domain 3: CNS - Communication, Navigation & Surveillance Systems
Radios, transponders, navigation receivers, and surveillance equipment as installed and tested on aircraft.
- Understand signal paths from antenna to display or audio panel
Domain 4: Flight Instrument & Pitot-Static Systems
Static ports, pitot tubes, altimeters, and airspeed indicators - plus how leaks or blockages produce specific failure symptoms.
- Be able to trace a pitot-static leak to its likely cause
Domain 5: Digital Databus Systems
Modern avionics communication protocols and how digital data moves between line-replaceable units.
- Know the general architecture of databus signal flow, not just terminology
Domain 6: Aircraft Wiring, Hardware & Installation
Wire gauge, connectors, crimping, routing, and installation practices that keep systems reliable and compliant.
- Memorize proper wire bend radius and connector torque concepts
Domain 7: Tools, Test Equipment & Measurement Techniques
Multimeters, signal generators, and other bench tools, plus correct measurement technique for accurate readings.
- Understand when a non-phone calculator helps with test-equipment math during the exam
Domain 8: Safety, Housekeeping & Best Practices
Shop safety, ESD precautions, and general best practices that keep both technicians and aircraft systems protected.
- Connect safety practices to real consequences, not just rule recall
Key Takeaway
Domains 2, 3, and 6 tend to carry the most technical density on the CAET exam. Budget extra study time there rather than spreading effort evenly across all eight.
Registration, Fees, and Attempt Rules
AEA identifies GMetrix as the virtual proctoring provider and also permits approved physical proctors, so you have two paths to sit the exam. The fee difference is small but worth knowing before you register - full pricing context is in CAET Certification Cost 2026: Complete Pricing Breakdown.
| Proctoring Option | Fee | Setup Needed |
|---|---|---|
| Virtual proctoring (GMetrix) | $119 | Webcam, microphone, room scan, proctoring software |
| Approved physical proctor | $109 | In-person proctor location, government photo ID |
Your purchase includes up to three attempts. If you don't pass on the first try, there's a 24-hour wait before attempt two, and a two-week wait before attempt three. All testing - across every attempt - must be completed within 90 days of purchase, so don't buy your exam access before you're genuinely close to ready. For the exact scoring math behind that 70% threshold, see CAET Passing Score 2026: Exactly What You Need to Pass, and for scheduling windows and deadlines, check CAET Exam Dates 2026: Testing Windows, Deadlines & Scheduling.
Remote Testing Setup Requirements
If you choose virtual proctoring, the technical requirements matter as much as your content knowledge. You'll need government photo identification, a working webcam, a microphone, and you'll be asked to perform a room scan before the proctoring software locks in. Chromebooks and tablets are explicitly unsupported, so confirm your testing device is a standard Windows or Mac laptop or desktop well before exam day - discovering a compatibility issue at your scheduled time wastes an attempt slot unnecessarily.
A non-phone calculator is allowed during the exam, which matters for the arithmetic-heavy questions in Domain 2 (electrical theory) and some Domain 7 (test equipment) scenarios. Bring a basic calculator you're already comfortable using rather than learning a new one the night before.
A Domain-by-Domain Study Timeline
Generic study techniques only help when they're mapped to CAET's actual content weighting. Rather than a one-size-fits-all weekly template, sequence your prep so foundational domains come first and applied/procedural domains come last, since Domains 3 through 6 build directly on the electrical theory in Domain 2.
Foundations
- Drill Domain 2 (Basic Electrical Theory & Systems) with circuit practice problems
- Review Domain 1 regulatory and documentation basics
Applied Systems
- Study Domain 3 (CNS) signal paths and Domain 4 (pitot-static) failure scenarios
- Use spaced repetition flashcards for CNS component names and functions
Digital & Physical Systems
- Cover Domain 5 (Digital Databus Systems) architecture
- Practice Domain 6 wiring, connector, and hardware installation standards
Tools & Full Review
- Focus on Domain 7 test equipment technique and Domain 8 safety practices
- Run full-length timed practice exams to build 90-minute pacing
Whichever pace you choose, don't schedule your first attempt until timed practice sessions on CAET Exam Prep consistently land above the 70% passing threshold - ideally with margin, since exam-day nerves cost a few extra points for most candidates.
Question Format and What Trips Candidates Up
Every question on the CAET exam is multiple choice, but "multiple choice" covers a wide range of difficulty. Some questions are straight recall - name the component, identify the regulation. Others present a short scenario (a symptom, a reading, a failure description) and ask you to identify the most likely cause or correct next step. These scenario-based items are where candidates who only memorized definitions tend to lose points, because they require connecting Domain 2 theory to Domain 3, 4, or 6 real-world symptoms.
- Wiring and hardware questions often describe a physical condition (a crimp, a bend radius, a connector type) and ask what's wrong or what standard applies.
- Pitot-static questions frequently describe instrument readings and ask you to diagnose the fault location.
- Test equipment questions may ask you to interpret a meter reading rather than just name a tool.
If you want a broader sense of how difficult candidates generally find the exam and where the real friction points are, How Hard Is the CAET Exam? Complete Difficulty Guide 2026 and CAET Pass Rate 2026: What the Data Shows go into more depth than a single study guide can. For a fast pre-exam refresher, keep CAET Cheat Sheet 2026: One-Page Review of Must-Know Facts handy the night before.
Key Takeaway
Don't just memorize domain lists - practice applying Domain 2 electrical theory to scenario questions in Domains 3, 4, and 6. That's where the exam differentiates prepared candidates from crammers.
Who Hires CAET-Certified Technicians
Employers in avionics shops, MRO facilities, and aircraft maintenance operations use the CAET credential as a baseline signal of competency for entry-level and early-career electronics technicians. Because there are no formal prerequisites, it's also a common target for technicians transitioning from adjacent electrical or electronics trades into aviation-specific work. If you're evaluating whether the certification is worth pursuing for your career stage, Is the CAET Certification Worth It? Complete ROI Analysis 2026 and CAET Salary Guide 2026: Complete Earnings Analysis lay out the considerations without relying on inflated claims. For active listings and role expectations, CAET Jobs is a useful companion read, and if you're still building foundational skills before testing, look at CAET Training options.
Renewal After You Pass
Passing the exam isn't the finish line - CAET certification renews every three years. To recertify, you need 18 Continuing Education Hours (CEHs) within that cycle. Alternatively, earning an approved higher CAET credential or completing the online recertification exam also satisfies the requirement for that cycle. Build a habit of logging CEH-eligible training as you go, rather than scrambling in year three.
Frequently Asked Questions
The Level 1 CAET exam has 100 multiple-choice questions with a 90-minute time limit. You need a 70% score to pass.
Yes. Virtual proctoring through GMetrix costs $119, while using an approved physical proctor brings the fee down to $109.
Your purchase covers up to three attempts. You must wait 24 hours before a second attempt and two weeks before a third, and all attempts must be completed within 90 days of purchase.
No. Chromebooks and tablets are unsupported for remote virtual proctoring. You'll need a standard laptop or desktop with a webcam and microphone, plus government photo ID for verification.
No formal prerequisites exist for the base Level 1 CAET assessment, which is why it's commonly used as an entry point for aircraft electronics technicians.