The Multi-Engine Instructor Certificate 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.