- What This Cheat Sheet Covers (and What It Doesn't)
- The Standards Snapshot: ACS, Dates, and Authority
- The 14 ACS Areas at a Glance
- The Additional Multiengine Instructor Rating Table
- Knowledge Test Facts: AFA, FIA, and the Fundamentals Exemption
- Multiengine Operations: The Material You Must Teach Cold
- Instructing Skills: Domains 1 Through 4
- A Domain-Driven Prep Sequence
- Cheat Sheet Traps to Avoid
- Frequently Asked Questions
- MEI here means the Multiengine Flight Instructor Rating, assessed under the FAA's FAA-S-ACS-25 Flight Instructor Airplane ACS.
- FAA-S-ACS-25 is dated November 2023 and became effective May 31, 2024.
- The 14 listed headings are ACS Areas, not percentage-weighted exam domains.
- The additional rating table on printed page 98 sets required Tasks based on ratings you already hold.
What This Cheat Sheet Covers (and What It Doesn't)
This page is a compressed review of the facts that matter most when you are preparing to add a multiengine instructor rating to a flight instructor certificate. It is built around the FAA's own standards document rather than around folklore from the hangar. If you want the long-form version of any section, the MEI study guide expands on preparation, and the complete guide to all 14 content areas goes deeper on each heading.
One clarification up front, because the acronym is crowded: in this article, MEI means exactly one thing, the Multiengine Flight Instructor Rating issued under FAA rules. Everything below comes from FAA standards and regulations. If you have landed here looking for a different credential that shares the letters, the facts on this page will not apply to it. The pages What Is MEI? and What Does MEI Stand For? cover the naming question directly.
The Standards Snapshot: ACS, Dates, and Authority
The governing body is the Federal Aviation Administration. The governing document for the flight instructor airplane practical test is FAA-S-ACS-25, the Flight Instructor Airplane Airman Certification Standards. These are the facts worth memorizing:
| Item | Fact |
|---|---|
| Governing body | Federal Aviation Administration |
| Standards document | FAA-S-ACS-25, Flight Instructor Airplane ACS |
| Document date | November 2023 |
| Effective date | May 31, 2024 |
| Multiengine instructor table location | Printed page 98 |
| Regulatory reference for the fundamentals exemption | 14 CFR 61.191(b) |
The ACS is the document your evaluator works from. It lists Areas of Operation, the Tasks within each, and the knowledge, risk management, and skill elements for each Task. Studying from anything older than the current edition is a common and avoidable mistake. The FAA keeps the current version on its ACS page, and the PDF for the airplane flight instructor standard is the authoritative copy.
For the full list of eligibility conditions that sit around the rating, including prerequisites and endorsements, see MEI requirements: eligibility, prerequisites, and how to qualify.
The 14 ACS Areas at a Glance
The flight instructor airplane ACS organizes its content under 14 overarching Areas. This is the most frequently misread part of the standard, so state it plainly: these are Areas of Operation, not percentage-weighted exam domains. There is no published weighting that says one Area counts for a certain share of a score, and you should be skeptical of any resource that claims otherwise. It is also incorrect to say all 14 are universally required for every candidate. Which Tasks apply to you depends on the table discussed in the next section.
| # | Area | What it centers on |
|---|---|---|
| 1 | Fundamentals of Instructing | Teaching theory, learning process, and instructor responsibilities |
| 2 | Technical Subject Areas | Aeromedical factors, regulations, and other subject knowledge you must teach |
| 3 | Preflight Preparation | Lesson planning and student readiness |
| 4 | Preflight Lesson on a Maneuver to be Performed in Flight | Delivering a ground lesson on a specific maneuver |
| 5 | Preflight Procedures | Aircraft inspection, cockpit management, and starting procedures |
| 6 | Airport and Seaplane Base Operations | Surface operations and airport environment |
| 7 | Takeoffs, Landings, and Go-Arounds | Instructing and demonstrating the full takeoff and landing set |
| 8 | Fundamentals of Flight | Basic control and flight principles |
| 9 | Performance and Ground Reference Maneuvers | Maneuvering relative to the ground and performance maneuvers |
| 10 | Slow Flight, Stalls, and Spins | Teaching recognition, entry, and recovery |
| 11 | Basic Instrument Maneuvers | Attitude instrument flying fundamentals |
| 12 | Emergency Operations | Abnormal and emergency procedures |
| 13 | Multiengine Operations | The multiengine-specific Tasks |
| 14 | Postflight Procedures | Closing out the flight and the lesson |
For a candidate adding the multiengine rating, Area 13 is the center of gravity, but it does not stand alone. Your evaluator assesses your ability to teach and demonstrate, so the instructing Areas and the maneuver Areas still shape how the multiengine content is judged. See how hard the MEI exam is for a discussion of where candidates tend to struggle.
The Additional Multiengine Instructor Rating Table
This is the single most important mechanism on the whole cheat sheet. The ACS includes an additional rating table, which for the multiengine instructor rating appears on printed page 98. It tells the evaluator which Tasks must be covered, and the answer depends on the ratings you already hold.
In practice this means two candidates adding the same rating can face different practical tests. A candidate who already holds a related instructor rating may have a narrower list of required Tasks than one coming in with a thinner set of ratings. Do not assume your list matches a friend's. Read the table against your own certificate, and confirm the plan with your evaluator before test day.
What to verify before scheduling
Work through the table deliberately with your own certificate in hand.
- List every instructor rating and aircraft category/class rating you currently hold.
- Locate the multiengine instructor rating table on printed page 98 and map your held ratings to the required Tasks.
- Note any conflict between held ratings and apply the least restrictive result.
- Ask your evaluator which remaining Areas or Tasks they intend to assess.
Cost and timeline depend on how much training you need to close gaps found in this exercise; see MEI certification cost for the pricing breakdown and MEI training for how programs structure the work.
Knowledge Test Facts: AFA, FIA, and the Fundamentals Exemption
Candidates frequently arrive with a vague belief that there is a single multiengine instructor knowledge test. The FAA's structure is more specific, and the facts below keep you from preparing for the wrong exam.
| Test | Format per the FAA Testing Matrix | Notes |
|---|---|---|
| AFA | 25 questions, 1 hour | Distinct from FIA; applicability and exclusions apply |
| FIA | 100 questions, 2.5 hours | Used by glider-rated instructors adding airplane |
The FAA Testing Matrix, revised September 25, 2026, distinguishes the two. If you discuss those figures, keep the surrounding conditions attached: applicability and exclusions matter, and the matrix itself is the source of record. Do not treat AFA as a universal multiengine knowledge test. Whether a knowledge test applies to you at all depends on your existing certificates and ratings.
Rules that trip candidates up
Several details are easy to garble when they are passed along secondhand.
- Glider-rated instructors adding airplane use the FIA test.
- Added-rating tests are not for holders of sport-only instructor certificates.
- Unscored validation questions: optional unscored questions are excluded from the listed question counts but are included in the testing time.
- 14 CFR 61.191(b) provides an exemption from the fundamentals-of-instructing knowledge test, not a blanket exemption from every knowledge test.
Because the exemption is narrow, never read it as "no knowledge testing required." Confirm your exact situation against the regulation and the testing matrix. The MEI passing score article discusses how scoring is reported, and MEI exam dates covers scheduling windows. For the broader picture of outcomes, see what the pass rate data shows.
Multiengine Operations: The Material You Must Teach Cold
Area 13, Multiengine Operations, is where the rating earns its name. The ACS frames each Task around knowledge, risk management, and skill, and as an instructor you must be able to teach and demonstrate to the standard, not merely perform. The topics below are the core subject matter that this Area exists to examine; confirm the exact Task list against your copy of the ACS.
Engine-out thinking
Everything in multiengine instruction is organized around losing an engine, and you must explain the why behind each procedure.
- How asymmetric thrust affects control, and why directional control is the first priority.
- Identification, verification, and securing of the failed engine as a disciplined sequence rather than a reflex.
- Recognizing the conditions under which continued flight is and is not assured, and how that shapes the go/no-go decision.
Performance and minimum control concepts
Instructors are expected to explain the relationships among the airspeeds and configurations that govern engine-out handling.
- The meaning and use of the key multiengine reference airspeeds from the airplane's operating documents.
- Why low-speed asymmetric flight is hazardous and how to teach safe demonstration of the limits.
- How density altitude, weight, and configuration change available performance with one engine inoperative.
Systems and operational management
Multiengine airplanes add systems complexity that a single-engine instructor may not have taught before.
- Fuel management and crossfeed considerations for the specific airplane.
- Propeller control and feathering concepts.
- Electrical and hydraulic redundancy as described in the airplane's flight manual.
This is also where hiring interest concentrates. Flight schools and training operations that teach multiengine students rely on instructors holding the rating, and the MEI jobs page describes who tends to hire. For the financial side, the salary guide and the ROI analysis discuss earning potential qualitatively.
Instructing Skills: Domains 1 Through 4
A multiengine instructor rating is still an instructor credential. Evaluators care whether you can teach, so the instructing Areas are not filler. They are where an otherwise strong pilot can lose points.
Fundamentals of Instructing
Expect to demonstrate command of how people learn and how an instructor conducts a lesson.
- Learning theory, student motivation, and communication in a briefing.
- Instructor responsibilities, professionalism, and the student-evaluation process.
Technical Subject Areas
The subject matter you are responsible for teaching, delivered accurately.
- Regulatory, aeromedical, and operational knowledge relevant to the lesson at hand.
Preflight Preparation and the Preflight Lesson
Domains 3 and 4 are where lesson structure shows.
- A lesson plan with a clear objective, completion standard, and sequence.
- A preflight lesson on a single maneuver, delivered as you would to a real student, including common errors and how you would correct them.
The common failure pattern here is performing the maneuver beautifully but explaining it poorly. Practice the briefing aloud, and have someone play the student.
A Domain-Driven Prep Sequence
Rather than a generic schedule, order your preparation by what the standard emphasizes and by what is hardest to fix late. This sequence is a suggestion built around the Areas, not a published requirement.
Standards and Rating Table
- Read the ACS and the page 98 table against your own certificate.
- Confirm which knowledge test, if any, applies using the FAA Testing Matrix and 14 CFR 61.191(b).
Multiengine Operations Knowledge
- Study the airplane's flight manual for reference speeds, limitations, and engine-out procedures.
- Rehearse your explanation of asymmetric thrust and engine-out decision making.
Instructing Areas
- Build and deliver preflight lessons on maneuvers from Domains 7 through 12.
- Record yourself and review where your explanations break down.
Integration and Mock Evaluation
- Run a full mock evaluation with an instructor who plays the evaluator.
- Close any gaps in the remaining Areas an evaluator may assess.
Check your recall along the way with questions at the practice test site, and confirm timing for your own test on the exam dates page.
Cheat Sheet Traps to Avoid
The compressed format of a cheat sheet invites oversimplification. These are the mistakes the facts above are designed to prevent.
- Treating the 14 Areas as weighted domains. They are not percentage-weighted, and no published weighting should be assumed.
- Assuming all 14 Areas are required for everyone. The page 98 table determines the required Tasks for your situation.
- Believing the least restrictive rule is a guarantee. Evaluators may assess remaining Areas or Tasks.
- Calling AFA the multiengine knowledge test. AFA and FIA are distinct tests with different formats, and applicability and exclusions apply.
- Reading 14 CFR 61.191(b) as a full exemption. It covers the fundamentals-of-instructing test only.
- Using a stale standard. Confirm you are studying the current FAA-S-ACS-25.
Key Takeaway
Your personal requirements come from two places only: the page 98 additional rating table matched to the ratings you already hold, and the FAA Testing Matrix as it applies to your certificates. Settle both before you spend time on anything else, then confirm the plan with your evaluator.
If you are still deciding whether this path fits your goals, the MEI certification overview is a good starting point.
Frequently Asked Questions
The FAA's FAA-S-ACS-25, the Flight Instructor Airplane Airman Certification Standards, dated November 2023 and effective May 31, 2024. Always confirm you are using the current edition from the FAA's ACS page.
No. The 14 headings are overarching ACS Areas, not percentage-weighted exam domains. They also are not all universally required, because the additional rating table determines which Tasks apply to you.
It sets the required Tasks for adding the multiengine instructor rating according to the ratings you already hold. When multiple held ratings give different requirements, the least restrictive applies, though evaluators may still assess remaining Areas or Tasks.
Per the FAA Testing Matrix, revised September 25, 2026, AFA is 25 questions in 1 hour and FIA is 100 questions in 2.5 hours. Applicability and exclusions apply, glider-rated instructors adding airplane use FIA, and optional unscored validation questions are excluded from the counts but included in testing time.
No. It provides an exemption from the fundamentals-of-instructing knowledge test only. It is not a blanket exemption, so confirm which tests apply to your certificates using the regulation and the FAA Testing Matrix.