MEI Certification

What the Multiengine Flight Instructor Rating Actually Is

The Multiengine Flight Instructor Rating, commonly shortened to MEI, is an FAA rating that authorizes a certificated flight instructor to teach in multiengine airplanes. It is not a standalone credential and it is not a membership designation. It is an added rating, which means it builds on a flight instructor certificate you already hold and extends your instructional privileges to a more complex class of aircraft.

Because the acronym is shared by several unrelated credentials in other industries, it is worth being precise: everything in this article concerns the airplane instructor rating regulated by the Federal Aviation Administration. If you are still orienting yourself to the terminology, our explainers on what MEI is and what MEI stands for cover the basics, and MEI requirements walks through eligibility and prerequisites in detail.

The practical meaning is straightforward. A flight instructor with only single-engine privileges cannot give multiengine instruction for a certificate or rating. The MEI removes that limit. It is the credential that lets an instructor train pilots for the multiengine rating, instruct in multiengine aircraft, and conduct the specialized emergency work that defines this category of flying.

Who Governs It and What Standard Applies

The governing body is the Federal Aviation Administration. The evaluation standard is the FAA-S-ACS-25 Flight Instructor Airplane Airman Certification Standards, published in November 2023 and effective May 31, 2024. The ACS defines what an evaluator may assess and what level of performance is acceptable. It integrates knowledge, risk management, and skill elements for each Task, which is why preparation for an MEI is never purely a memorization exercise.

You can find the current standard and related material at the FAA ACS page (faa.gov/training_testing/testing/acs) and the Airplane CFI ACS document itself (cfi_airplane_acs_25.pdf). Treat the PDF as the authoritative source whenever a forum post, a study aid, or this article seems to conflict with it.

The 14 ACS Areas, Explained for MEI Candidates

The Airplane ACS organizes content under 14 overarching Areas. These are headings, not percentage-weighted exam domains. There is no published scheme that says Area X is worth a set share of your evaluation, so avoid any study resource that presents the list as if it were a weighted blueprint. For a broader walk-through of how these headings fit together, see our complete guide to all 14 MEI content areas.

Notice that Area 13, Multiengine Operations, is the area most obviously tied to the rating, but it does not stand alone. Area 12, Emergency Operations, and Area 7, Takeoffs, Landings, and Go-Arounds, carry much of the multiengine-specific risk, and Area 1, Fundamentals of Instructing, shapes how you are expected to present everything else.

The Additional Rating Table: Why Your Tasks Vary

This is the single most misunderstood feature of the MEI evaluation. The ACS includes an additional multiengine instructor rating table on printed page 98. That table determines which Tasks are required based on the ratings you already hold. It exists because an instructor who already holds, for example, instrument or other privileges has already demonstrated certain competencies, and the evaluation does not need to duplicate all of them.

Two rules from the standard are worth internalizing:

• Where multiple held ratings give different requirements, the least restrictive applies. You are not penalized for holding a more complicated set of ratings.
• Evaluators may still assess the remaining Areas and Tasks. The table sets the required minimum, not a ceiling on what an evaluator may probe.

Before you schedule anything, sit down with the table and your own certificate and mark exactly which Tasks apply to you. This single exercise prevents wasted study time and removes a great deal of checkride anxiety. If you want a view of how demanding the process tends to feel in practice, read how hard the MEI exam is.

Knowledge Tests: AFA, FIA, and the 61.191(b) Exemption

Knowledge testing around flight instructor ratings is where candidates most often get tangled, so precision matters. The FAA Testing Matrix (revised September 25, 2026) is the reference to consult; it is available at faa.gov/training_testing/testing/testing_matrix.

The matrix distinguishes two instructor knowledge tests that are sometimes conflated:

Several qualifications apply to those figures. Optional unscored validation questions are excluded from the listed question counts but are included in the testing time. Applicability and exclusions matter: the matrix states who each test is for, and added-rating tests are not for holders of only a sport instructor certificate. Do not treat the AFA as a universal MEI knowledge test. Whether a knowledge test is required for your particular path depends on your current certificates and ratings.

What 61.191(b) does and does not do

Title 14 CFR 61.191(b) provides an exemption relating to the fundamentals-of-instructing knowledge test. It is a narrow exemption, not a blanket waiver of every knowledge test. Read the regulation directly at the eCFR (14 CFR 61.191) rather than relying on summaries, since the specific conditions determine whether it applies to you.

Multiengine Topics You Must Be Able to Teach

The distinguishing feature of an MEI evaluation is that you are judged as an instructor. It is not enough to fly the maneuver well. You must explain it, demonstrate it, recognize and correct a student's errors, and manage risk while doing so. The following blocks outline the multiengine-specific content that tends to define the rating.

Teaching skill still decides the outcome

Area 1, Fundamentals of Instructing, and Area 4, the Preflight Lesson on a Maneuver to be Performed in Flight, are where the instructor-specific evaluation lives. Expect to deliver a coherent ground lesson on a multiengine maneuver, with clear objectives, an accurate explanation, a realistic assessment of common student errors, and a plan for in-flight demonstration and critique. A technically perfect flight paired with a muddled lesson is a common reason candidates struggle.

Who Hires MEIs and Why the Rating Matters

The multiengine instructor rating matters most to people building a career in flight training and to pilots working toward professional flying. Demand tends to be concentrated in a few settings:

• Flight schools and academies that offer multiengine ratings to commercial and career-track students and need instructors authorized to teach them.
• University aviation programs whose curricula include multiengine training.
• Independent instructors serving private owners who need a multiengine rating, a checkout, or recurrent training in their own aircraft.
• Operators and training providers that value instructors with complex-aircraft experience.

The rating also has a strategic role: it widens the pool of students an instructor can serve and can make an instructor more useful to a school with limited multiengine staff. We avoid quoting income figures here because they vary widely by region, employer, and aircraft availability; for a more structured discussion, see the MEI salary guide, MEI jobs, and whether the MEI is worth it. Costs, which depend heavily on aircraft rental rates and the amount of training you need, are covered in the MEI certification cost breakdown.

Sequencing Your Preparation Around Multiengine Content

Rather than generic scheduling advice, build your preparation around the structure of the rating itself. The idea is to resolve the "what applies to me" question first, then spend time where instructor performance is hardest to fake.

For a fuller preparation framework, use the MEI study guide, and keep the MEI cheat sheet handy for quick review. If you want practice questions to support the knowledge side, our practice test is a place to start, and you can try additional question sets on the main practice site as your preparation progresses. You may also want to look at MEI training options before choosing a provider.

Frequently Asked Questions