- What the Multiengine Flight Instructor Rating Actually Is
- Core Prerequisites Before You Add the Rating
- Knowledge Testing: What Applies and What Doesn't
- How the ACS Defines What You Must Demonstrate
- The Additional Multiengine Instructor Rating Table
- The 14 ACS Areas Through a Multiengine Lens
- Mastering the Multiengine Operations Area
- A Practical Qualification Path
- Sequencing Your Preparation by Area
- Who Hires Multiengine-Rated Instructors
- Frequently Asked Questions
- The MEI is an added rating on a flight instructor certificate, assessed against the FAA-S-ACS-25 Flight Instructor Airplane ACS.
- The ACS lists 14 Areas, but they are not percentage-weighted domains, and not every Area applies to every candidate.
- The additional multiengine instructor rating table on printed page 98 sets required Tasks based on ratings you already hold.
- 14 CFR 61.191(b) exempts you only from the fundamentals-of-instructing knowledge test, not from every knowledge test.
What the Multiengine Flight Instructor Rating Actually Is
The Multiengine Flight Instructor Rating (MEI) is an FAA-issued rating that authorizes a certificated flight instructor to provide training in multiengine airplanes. It is not a standalone certificate and it is not a freestanding multiple-choice credential. It is an added rating on a flight instructor certificate, and the Federal Aviation Administration is the governing body for every step of it.
That distinction shapes everything about how you qualify. You are not registering for a single exam and receiving a score report. Instead, you are demonstrating, in a practical test with an evaluator, that you can teach and fly multiengine maneuvers to the standard published in the Flight Instructor Airplane Airman Certification Standards (FAA-S-ACS-25, published November 2023 and effective May 31, 2024).
If you are new to the terminology, our explainers on what the MEI is and what MEI stands for cover the basics. This article focuses on the practical question: what do you need to qualify, and in what order?
Core Prerequisites Before You Add the Rating
Because the MEI is an added rating, the logical starting point is that you must already hold the underlying instructor privileges it attaches to. In broad terms, candidates arrive at this rating in one of a few ways:
- You already hold a flight instructor certificate with an airplane rating and want to add multiengine instructor privileges.
- You hold a flight instructor certificate in another category, such as a glider rating, and are adding airplane instruction.
- You are completing an initial instructor certification and plan to add the multiengine rating as part of that progression.
Underlying all of these, you will need to be qualified to act as pilot in command in the multiengine airplane in which you will test. In practice, that means holding the pilot ratings that support multiengine operations and having meaningful time and proficiency in the aircraft. The exact certificate and aeronautical experience requirements are written into 14 CFR Part 61, Subpart H, and you should read the current text rather than rely on a summary. For a fuller picture of how total investment adds up, see our MEI certification cost breakdown.
Key Takeaway
Before spending money on aircraft time, confirm in writing with your evaluator or flight school which ratings you hold, which ones you need, and which ACS Tasks they expect you to demonstrate. That one conversation prevents the most common planning mistakes.
Knowledge Testing: What Applies and What Doesn't
Knowledge-test questions generate the most confusion around this rating, so precision matters here.
The 61.191(b) exemption is narrow
14 CFR 61.191(b) provides an exemption from the fundamentals of instructing knowledge test under certain circumstances. It is not a blanket exemption from every knowledge test. Do not read it as "added ratings never need a knowledge test." Whether any other test applies to you depends on which ratings you hold and what you are adding.
AFA versus FIA
The FAA Testing Matrix distinguishes two instructor knowledge tests relevant to airplane instructors. The current matrix (revised September 25, 2026) lists:
| Test | Questions | Time Allowed | Who It Is For (in Brief) |
|---|---|---|---|
| AFA | 25 questions | 1 hour | Added-rating situation for existing instructors, subject to the matrix's applicability and exclusions |
| FIA | 100 questions | 2.5 hours | Initial airplane instructor knowledge test; also used by glider-rated instructors adding airplane privileges |
Two cautions apply. First, these figures are only meaningful alongside the applicability and exclusion language in the Testing Matrix. Second, AFA is not a universal MEI knowledge test. It is an added-rating test with specific eligibility conditions, and added-rating tests are not for sport-only instructor holders. Optional unscored validation questions are excluded from the listed question counts but are included in the testing time.
For a candid look at difficulty and results, see how hard the MEI is and what the data says in our pass-rate discussion. If you want to drill the knowledge side, our practice test platform is built for that.
How the ACS Defines What You Must Demonstrate
The FAA-S-ACS-25 organizes the instructor practical standard into 14 Areas. Each Area contains Tasks, and each Task links knowledge, risk management, and skill elements. This is the document your evaluator uses, so it is the document you should study.
A crucial point that candidates often miss: these 14 headings are overarching ACS Areas, not percentage-weighted exam domains. There is no published scoring weight that says one Area is worth a set share of the outcome. And you should not assume all 14 Areas are required for every candidate. Which Tasks you are actually tested on depends on the ratings you already hold, which is exactly what the next section explains. For a deeper walk-through of each Area, read our complete guide to the 14 content areas.
The Additional Multiengine Instructor Rating Table
The mechanism that determines your required Tasks is the additional multiengine instructor rating table on printed page 98 of the ACS. Rather than prescribing one fixed list for everyone, the table maps the Tasks you must perform to the ratings you already hold.
Three rules govern how it works:
- Required Tasks depend on held ratings. A candidate who already holds certain instructor and pilot ratings will face a different required-Task set than one adding the multiengine rating with a thinner background.
- Least restrictive applies. Where multiple held ratings produce different requirements, the least restrictive requirement governs.
- Evaluators may assess more. Even after the table sets your required Tasks, the evaluator may assess remaining Areas and Tasks. Treat the table as the floor, not a ceiling on what you might be asked.
Key Takeaway
Print page 98 of the ACS, mark which of your held ratings feed into it, and bring that annotated page to your pre-checkride briefing. It turns a vague "what will I be tested on?" into a concrete, verifiable list.
The 14 ACS Areas Through a Multiengine Lens
Below are the 14 Areas as they appear in the ACS, with the multiengine-specific angle a candidate should bring to each. Remember: which Tasks within them are required depends on the page 98 table.
Fundamentals of Instructing
The teaching foundation: the learning process, human behavior, effective communication, assessment, planning instructional activity. Note that 14 CFR 61.191(b) addresses only the fundamentals-of-instructing knowledge test, not this practical Area.
- Be ready to teach multiengine concepts, not just fly them
- Expect scenario-based questions on how you would correct a student's misunderstanding
Technical Subject Areas
Aeronautical knowledge you must teach accurately, including aircraft systems, performance, and weight and balance.
- Multiengine systems: fuel crossfeed, propeller controls, electrical and hydraulic redundancy
- Performance with one engine inoperative and its effect on climb capability
Preflight Preparation
Planning and documentation before the flight, including weather, airworthiness, and loading.
- Weight and balance for the specific multiengine airplane you will use
- Performance planning that accounts for engine-out margins
Preflight Lesson on a Maneuver to be Performed in Flight
You deliver an actual lesson to the evaluator as if teaching a student, then perform the maneuver.
- For multiengine, expect lesson topics tied to engine-out procedures or Vmc demonstration
- Structure matters: objective, content, common errors, completion standards
Preflight Procedures
Cockpit management, engine starts, taxi, and before-takeoff checks.
- Multiengine-specific checklist discipline and systems checks
Airport and Seaplane Base Operations
Runway incursion avoidance, communications, and airport environment procedures.
Takeoffs, Landings, and Go-Arounds
Normal, crosswind, and short-field operations, plus go-arounds.
- Pay particular attention to multiengine-specific takeoff and landing variants and the decision points built into them
Fundamentals of Flight
Aerodynamic principles you must teach and demonstrate, including their multiengine implications such as asymmetric thrust.
Performance and Ground Reference Maneuvers
Precision maneuvering and instructional demonstration from the instructor's seat, including how you position yourself for student observation and safety.
Slow Flight, Stalls, and Spins
Recognition, recovery, and the instructor's role in managing risk during these maneuvers.
- In multiengine airplanes, your instructional approach to stalls differs from single-engine, and your risk management must reflect that
Basic Instrument Maneuvers
Attitude instrument flying and the ability to teach it effectively.
Emergency Operations
Systems malfunctions, abnormal and emergency procedures, and your ability to teach and simulate them safely.
Multiengine Operations
The Area that most directly defines this rating. Covered in detail in the next section.
Postflight Procedures
Post-flight tasks, securing the aircraft, and debrief and record-keeping. In instruction, the debrief is itself a teaching event.
Mastering the Multiengine Operations Area
If any Area is the heart of the rating, it is Multiengine Operations. Everything else in the ACS is shared with the broader airplane instructor standard. This is the Area where your multiengine-specific competence and teaching ability are under the most direct scrutiny.
Concepts you must be able to teach, not just perform
- Engine-out aerodynamics: why asymmetric thrust creates yaw and roll, and how that shapes control technique.
- Minimum control speed (Vmc): what factors affect it, why those factors matter, and how to demonstrate it safely without turning a lesson into a hazard.
- Engine-out performance: the real climb performance picture on one engine, including why some conditions leave an airplane unable to climb on one engine at all.
- Systems management: propeller feathering, fuel management, and the electrical and other systems that complicate a multiengine airplane.
- Decision-making: the go/no-go and continue/abort decisions around engine failures during takeoff and flight.
For targeted review material, our study guide and one-page cheat sheet are useful complements to your aircraft-specific manuals.
A Practical Qualification Path
Because qualification is stage-based rather than exam-date-based, think of it as a sequence:
- Audit your held ratings. List every pilot and instructor rating you currently hold. This drives both the page 98 table and any knowledge-test question.
- Confirm the knowledge-test situation. Check the current FAA Testing Matrix and confirm with your instructor whether AFA, FIA, or no additional test applies to your case. Remember the 61.191(b) exemption is limited to fundamentals of instructing.
- Map your required ACS Tasks. Use the page 98 table, apply the least-restrictive rule where relevant, and note that the evaluator may still assess other Areas.
- Train in the airplane you will test in. Build proficiency in both the flying and the teaching, with an emphasis on engine-out operations.
- Obtain the required endorsements and complete the practical test with an authorized evaluator, to the ACS standard.
Scheduling specifics vary by evaluator and testing facility, so see our notes on MEI exam dates and scheduling for how to think about timing. Also review what a passing performance means in practice in our guide to the MEI passing score.
Sequencing Your Preparation by Area
One short note on scheduling. Rather than studying all 14 Areas evenly, sequence them by dependency and risk. The block below is a suggested approach, not a prescribed program; adjust it based on your page 98 required Tasks.
Foundations and Gap Analysis
- Read the ACS front matter and the page 98 table
- Review Fundamentals of Instructing and Technical Subject Areas
Multiengine Technical Depth
- Systems, performance, and weight and balance for your specific airplane
- Engine-out aerodynamics and Vmc factors
Maneuver Lessons and Emergency Operations
- Draft and rehearse preflight lessons for engine-out maneuvers
- Rehearse Emergency Operations scenarios and instructor risk management
Integration and Mock Evaluation
- Full mock flight with an instructor playing evaluator
- Close any gaps in remaining Areas the evaluator may assess
Who Hires Multiengine-Rated Instructors
The multiengine instructor rating opens doors in specific segments of aviation training. Typical employers and settings include:
- Flight schools and Part 141 and Part 61 training operations that offer multiengine add-on and commercial multiengine training.
- Airlines and regional carriers' training pipelines, where multiengine time and instructional experience are valued by candidates building toward those careers.
- Corporate and charter operators that use instructors for type and proficiency training.
- Universities with aviation programs that maintain multiengine fleets.
Because specific pay figures vary widely by region, employer, and aircraft, we avoid quoting numbers here. For a broader discussion, see our analyses of earnings, whether the rating is worth it, and MEI jobs. If you are interested in the training side, see our overview of MEI training.
Key Takeaway
The rating's value is concentrated where multiengine aircraft are actually flown for training. Identify two or three local schools or operators that operate multiengine fleets and ask what they look for before you invest in the rating.
Frequently Asked Questions
No. It is an added rating on a flight instructor certificate, assessed through a practical test against the FAA-S-ACS-25 standard. Any knowledge test that applies to you depends on the ratings you hold and what you are adding.
Not necessarily. The additional multiengine instructor rating table on printed page 98 sets required Tasks according to ratings you already hold, and the least restrictive requirement applies where held ratings differ. The evaluator may still assess remaining Areas and Tasks.
Only partly. It provides a fundamentals-of-instructing exemption, not a blanket exemption from every knowledge test. Check the FAA Testing Matrix and confirm with your instructor.
Per the FAA Testing Matrix, AFA is 25 questions in 1 hour and FIA is 100 questions in 2.5 hours, each subject to applicability and exclusions. Optional unscored validation questions are excluded from the question counts but included in testing time. AFA is not a universal MEI test.
Glider-rated instructors adding airplane privileges use the FIA. Added-rating tests are not for sport-only instructor holders. Always confirm against the current Testing Matrix.
For more on how the rating fits into your broader goals, see our overview of MEI certification and the main practice test site for knowledge-review tools.