CAET Exam Domains 2026: Complete Guide to All 8 Content Areas

CAET Exam Structure at a Glance

The Certified Aircraft Electronics Technician (CAET) credential is a Level 1 assessment created by the Aircraft Electronics Association (AEA) and delivered through Unmanned Safety Institute (USI). Before diving into the eight domains, it helps to understand the shape of the exam itself: 100 multiple-choice questions, a 90-minute time limit, and a 70% passing threshold. There are no formal prerequisites, so the domains themselves are the real gatekeeper - not a work-history requirement or a college degree.

Because the exam is domain-based rather than weighted toward a single specialty, candidates who treat every content area with equal seriousness tend to walk in far more prepared than those who guess at what matters most. If you haven't yet reviewed the baseline eligibility picture, the CAET requirements overview is a useful companion to this guide.

The 8 CAET Exam Domains Explained

Every CAET question falls under one of eight official topic areas. Below is what each domain typically demands from a candidate preparing for the base Level 1 CAET assessment (not the AET upgrade or CAET-Advanced track).

For a deeper dive into how tough each of these areas actually is in practice, see How Hard Is the CAET Exam?, which walks through where most candidates lose points.

Question Style and Format

Every question on the CAET exam is multiple-choice, drawn from the eight domains above. With 100 questions in a 90-minute window, you have roughly 54 seconds per question on average - enough time to think carefully, but not enough to second-guess every answer repeatedly. Because the passing score is 70%, you can afford to miss a meaningful number of questions and still certify, which is worth knowing if you tend to freeze up on a handful of unfamiliar items.

The exam doesn't isolate domains into separate timed sections - questions from Domain 2 (Basic Electrical Theory & Systems) can appear right next to a question from Domain 8 (Safety, Housekeeping & Best Practices). That mixed format rewards candidates who've built broad familiarity across all eight areas rather than mastering one or two and hoping the rest sorts itself out. For the exact numeric threshold and how it's calculated, check the CAET passing score breakdown.

Registration, Fees, and Attempt Policy

Registering for the CAET exam means choosing between two proctoring paths. AEA identifies GMetrix as its virtual proctoring provider, and virtual proctoring costs $119. If you'd rather test in person, AEA also permits approved physical proctors, which brings the fee down to $109.

If you go the remote route, note that Chromebooks and tablets are unsupported - you'll need a standard computer setup. A non-phone calculator is allowed during the exam, which matters for any electrical calculations that show up in Domain 2 or Domain 4 questions.

Your purchase includes up to three total attempts. If you don't pass on the first try, there's a mandatory 24-hour wait before attempt two, and a two-week wait before attempt three. All testing must be completed within 90 days of purchase, so plan your study timeline accordingly. For a complete cost comparison including what happens if you need to retest beyond your included attempts, read the CAET certification cost breakdown.

Who Hires CAET-Certified Technicians

The CAET credential exists because avionics shops, MRO facilities, and aircraft manufacturers need a standardized way to verify that a technician understands the fundamentals across communication, navigation, electrical systems, wiring, and safety practices - not just one narrow specialty. Because the certification has no formal prerequisites, it's often used as an entry validator for technicians moving into avionics-focused roles, while more experienced techs use it to formally document skills they've already built on the job.

If you're evaluating whether this credential fits your career path, the CAET salary guide and the CAET jobs overview both break down where this certification tends to show up in job postings and how it factors into hiring conversations. For a broader look at whether the investment of time and testing fees pays off, Is the CAET Certification Worth It? weighs the tradeoffs directly.

Mapping a Study Timeline to the Domains

Generic study advice rarely helps unless it's tied to the actual content you're being tested on. With eight domains and no published weighting, a straightforward approach is to dedicate focused blocks of time to each domain in sequence, then circle back for a full mixed-question review before your scheduled attempt.

This kind of sequencing works well because it moves from theory (electrical fundamentals) toward systems (CNS, instruments, databus), then finishes with the hands-on and procedural domains that are easiest to retain right before test day. For a more detailed week-by-week study plan built specifically around this exam, the CAET study guide expands on this structure considerably. It also helps to know exactly when testing windows open so your review schedule lines up - see the CAET exam dates guide for scheduling details.

Once you've worked through each domain individually, running full-length practice exams over at CAET Exam Prep is one of the fastest ways to find out which of the eight domains still need attention before your attempt. A quick pre-test review of the CAET cheat sheet can also help you lock in the details that tend to slip right before an exam.

Frequently Asked Questions