Becoming a Certified Flight Instructor (CFI) is probably the most challenging and rewarding experience for any pilot. The ability to spread your knowledge, excitement and love for aviation with new (and experienced) pilots is extremely rewarding. Once you have reached this stage in your flight training, you have already learned everything you need to know as a pilot about aeronautical knowledge and flight maneuvers. What you will learn during the Certified Flight Instructor Course is how to teach that knowledge to others.
The Certified Flight Instructor - Instrument (CFII) adds instrument instruction privileges to your current Flight Instructor Certificate. Similar to the CFI certificate, there are no flight time requirements outside the 3 hours of test preparation. The success of this course is largely dependent on your current instrument proficiency and your ability to teach in this advanced environment.
The Multi-Engine Instructor Certificate (MEI) adds multi-engine privileges to your current Certified Flight Instructor Certificate. This add-on can be accomplished with or without instrument instructor privileges; however it is most common to add this rating onto a CFII. Like the CFI and CFII, there are no flight time requirements outside the 3 hours test preparation. The success of this course is largely dependent on your current multi-engine aircraft knowledge, flight proficiency and your ability to teach in a sophisticated and complex aircraft.