The Multi-Engine Instructor (MEI) rating is one of the most valuable additions a flight instructor can earn, opening doors to a broader range of students and career opportunities in aviation. Whether pursued as an initial CFI certificate or as an additional rating, the MEI checkride requires focused preparation across regulatory knowledge, aircraft-specific maneuvers, and the ability to teach complex multi-engine concepts from the right seat. This outline breaks down the key areas CFI candidates must master before sitting for the MEI checkride, including ACS task requirements, MEI-specific flight training techniques, light twin performance considerations, aeronautical knowledge requirements, and the regulatory framework governing what an MEI certificate authorizes.

1. MEI Checkride Pathways and ACS Overview

   Summary The MEI checkride can be completed as either an initial CFI certificate or as an additional rating, with the additional rating being the most common route. Applicants are evaluated against the CFI ACS for Multi-Engine, and the checkride typically runs less than four hours with no IFR component required.
   

   Supporting Points

   1. The MEI can be pursued as an initial CFI certificate, meaning a prior single-engine CFI is not required before attempting the multi-engine instructor rating.

   2. When adding the MEI as an additional rating, applicants must reference the ratings task table in the appendix of the CFI ACS to identify which areas of operation are required.

   3. All applicants must be prepared to demonstrate knowledge of the Fundamentals of Instruction, as the FOI is a required component of the MEI checkride.

   4. Area of Operation XIII, Task C — Demonstration of Effects of Various Airspeeds and Configurations during Engine Inoperative Performance — is a task not previously tested on the multi-engine pilot checkride and will be new material for most applicants.
      

   Conclusion Understanding which ACS tasks apply to your specific certification pathway is the first step in building a focused and efficient MEI checkride preparation plan.
   

2. AO XIII Task C: Engine Inoperative Performance Demonstration
   

   Summary AO XIII Task C — formerly called the Drag Demonstration — requires the applicant to demonstrate and explain the effects of various airspeeds and configurations during engine inoperative flight. The objective is to show that Vyse with a clean configuration and zero sideslip produces the maximum rate of climb on a single engine.

   Supporting Points

   1. The applicant must demonstrate smooth control inputs while transitioning between configurations including landing gear extended, wing flaps extended, gear and flaps extended, and a windmilling propeller on the inoperative engine.

   2. The applicant is required to maintain appropriate airspeed, attitude, and altitude combinations throughout each configuration change during the demonstration.

   3. After completing the configurations, the applicant must return to normal cruise flight at the altitude and heading specified by the evaluator.

   4. The applicant must also be able to analyze and correct common errors related to this task, demonstrating the instructional competency required of an MEI candidate.
      

   Conclusion Mastery of AO XIII Task C is essential for MEI applicants because it directly reflects the instructor's ability to teach one of the most safety-critical concepts in multi-engine flight — single-engine performance management.
   

3. Feathering, Securing, and Engine Restart
   

   Summary MEI candidates must be proficient in the procedures for feathering and securing an engine as well as restarting after feathering, as these are core instructional maneuvers unique to multi-engine training. These procedures carry specific safety considerations that distinguish MEI instruction from standard single-engine flight training.
   

   Supporting Points

   1. Feathering and securing should not be performed below 3,000 feet AGL, and a suitable airport must be within range before shutting down an engine during training.

   2. Shutdown time should be limited to protect the engine from thermal stress, and instructors should plan restarts efficiently to avoid prolonged single-engine operation.

   3. If the aircraft is equipped with unfeathering accumulators, the instructor must know they are single-use per flight, requiring a deliberate and timely restart sequence.

   4. When the engine catches during restart, prop controls must be adjusted immediately to prevent an overspeed condition, and if a restart cannot be accomplished, the situation becomes an emergency requiring immediate action.
      

   Conclusion Proficiency in feathering, securing, and restarting procedures is foundational to MEI instruction because these are the maneuvers students are most likely to encounter incorrectly without proper guidance from a qualified instructor.
   

4. Instructor Techniques for Failing Engines in Training
   

   Summary Teaching engine failures in a multi-engine training environment requires deliberate technique by the MEI to ensure student learning while maintaining flight safety. The method used to fail the engine — and the altitude and configuration at which it is done — directly affects both safety and instructional effectiveness.
   

   Supporting Points

   1. Above 3,000 feet AGL, engine failures can be simulated using the mixture control or fuel selector; below that altitude, the throttle is used to avoid the risk associated with actual engine shutdown.

   2. Instructors should initially fail engines slowly using the throttle to gauge the student's reaction before progressing to more realistic failure scenarios.

   3. The power quadrant must be guarded at all times during simulated engine failures to prevent accidental feathering of a live engine.

   4. Zero thrust manifold pressure, approximately 12 to 15 inches, should be established on the failed engine to simulate realistic asymmetric thrust without actual engine shutdown.

   Conclusion Proper engine failure technique is a direct reflection of the MEI's instructional judgment, and understanding how to safely introduce asymmetric thrust scenarios is one of the most important skills a multi-engine instructor develops.
   

5. Engine Failure During Takeoff Roll Prior to Half Vmc
   

   Summary Failing an engine during the takeoff roll prior to reaching half of Vmc is one of the most safety-sensitive demonstrations an MEI will teach, requiring precise setup and execution. The goal is to demonstrate to the student that an engine failure at low speed requires immediate abort, not a continued takeoff attempt.
   

   Supporting Points

   1. The instructor should keep speeds low and manageable during the demonstration, ensuring the nosewheel is tracking straight before introducing the engine failure.

   2. Engines should be failed using the mixture control rather than the throttle to avoid a potential backfire that could startle the student or create a hazardous condition.

   3. The good engine's mixture should be returned to rich just behind the failed engine's control to allow for an immediate full-power abort and rollout.

   4. A long and wide runway should be selected whenever possible to provide maximum margin for stopping the aircraft following the simulated engine failure.
      

   Conclusion Teaching engine failure on the takeoff roll is among the highest-risk instructional maneuvers in multi-engine training, and proper setup, technique, and abort planning are non-negotiable elements of safe MEI instruction.
   

6. Vmc Demonstration Techniques
   

   Summary The Vmc demonstration is a required checkride maneuver that teaches the student the speed at which directional control can no longer be maintained with one engine inoperative and the other at full power. MEI candidates must know how to introduce this maneuver progressively and safely, understanding that real Vmc is rarely reached during training.
   

   Supporting Points

   1. Initial Vmc demonstrations should be conducted with wings level rather than the standard five-degree bank, which prevents the aircraft from reaching true Vmc and provides a margin of safety for student introductory training.

   2. Blocking rudder travel is another technique used to prevent the aircraft from reaching actual Vmc while still demonstrating the onset of directional control loss to the student.

   3. The instructor must ensure the student is not over-anticipating and reacting too quickly, as premature inputs can mask the actual aerodynamic cues the demonstration is designed to teach.

   4. If a stall indication or uncontrolled yaw begins, both throttles must be closed immediately and pitch attitude lowered to recover the aircraft below Vmc speed.
      

   Conclusion Teaching the Vmc demonstration safely and effectively is a defining test of MEI instructional competency, as it requires the instructor to balance genuine aerodynamic risk with the student's need to recognize and respond to the onset of directional control loss.
   

7. Light Twin Performance Considerations
   

   Summary Multi-engine instructors must have a thorough understanding of light twin performance limitations, particularly the dramatic impact of a single engine failure on climb capability. These performance realities must be communicated clearly to students before and during all multi-engine training flights.
   

   Supporting Points

   1. Approximately 80 percent of climb performance is lost when one engine fails on a light twin, and most light twins are incapable of maintaining a positive rate of climb on a single engine under real-world conditions.

   2. After calculating accelerate-go distance, the MEI should also calculate single-engine rate of climb to give students a concrete understanding of actual performance margins — for example, a 200 ft/min climb at 90 knots equates to only 133 feet of altitude gain per mile.

   3. Aircraft weight directly impacts single-engine performance, and lighter loading produces measurably better results, making weight management a key pre-flight consideration for all multi-engine training.

   4. Most light twins were never spin tested, and the emergency checklist procedures in multi-engine aircraft are recommendations rather than certified recovery techniques, a critical distinction instructors must convey to students.
      

   Conclusion Understanding the performance limitations of light twins — especially under single-engine conditions — is essential knowledge that every MEI must be prepared to teach accurately and immediately in both the preflight briefing and the cockpit.
   

8. MEI Aeronautical Knowledge Requirements

   Summary MEI candidates are expected to demonstrate deep aeronautical knowledge of Vmc determination, multi-engine systems, and aircraft-specific limitations as tested in the oral portion of the checkride. This knowledge must be translatable into effective instruction, not just recitation of facts.
   

   Supporting Points

   1. Applicants must be able to explain how Vmc is determined during aircraft certification and how factors such as altitude, weight, and bank angle cause Vmc to change in flight.

   2. The relationship between Vmc and stall speed in non-turbocharged engines must be clearly articulated, as density altitude causes Vmc to decrease while stall speed remains relatively constant, creating a scenario where stall occurs before Vmc is reached at high altitude.

   3. MEI candidates must be able to explain aircraft systems in context, connecting system knowledge directly to normal and emergency checklist procedures and demonstrating instructional fluency with the POH.

   4. Some aircraft have specific altitude restrictions for Vmc demonstrations listed in the limitations or supplements section of the POH, and the MEI must be familiar with and adhere to those aircraft-specific constraints.
      

   Conclusion Sentence Aeronautical knowledge mastery is not just a checkride requirement — it is the foundation of credible MEI instruction, giving future students confidence that their instructor understands the aircraft and its systems at the level required to keep them safe.
   

9. MEI Certificate Privileges and Regulatory Requirements
   

   Summary The MEI certificate carries specific privileges, prerequisites, and limitations defined under Part 61 that every candidate must understand before and after certification. Knowing what the certificate authorizes — and what it does not — is directly tested on the checkride and governs every instructional flight thereafter.
   

   Supporting Points

   1. The MEI certificate requires a minimum of 15 hours of PIC time in an AMEL aircraft before the applicant is eligible to take the checkride, per FAR 61.183(j).

   2. When providing instruction toward a certificate or rating, the MEI must have at least 5 hours of multi-engine flight time with a student in a make and model authorized under FAR 61.195(f), though this requirement does not apply to flight reviews, IPCs, WINGS activities, or currency flights.

   3. With the MEI certificate, an instructor may conduct initial certification and training for Private Pilot AMEL, Commercial Pilot AMEL, and ATP candidates, with no logbook endorsements required for ATP training.

   4. An MEI who also holds a CFII rating may conduct Instrument Proficiency Checks in AMEL aircraft, further expanding the scope of instruction available to multi-engine pilots.
      

   Conclusion

   A thorough understanding of MEI certificate privileges and regulatory requirements is not just necessary for the checkride — it defines the boundaries of safe and legal instructional practice for every multi-engine flight conducted after certification.