What is one of the requirements for a CFI's teaching limitations?

The requirement for a Certified Flight Instructor (CFI) to teach only in aircraft for which they are rated is fundamental to ensuring the safety and effectiveness of flight instruction. This limitation is put in place to guarantee that the instructor possesses the necessary knowledge, experience, and understanding of the specific aircraft's systems, performance characteristics, and operational procedures. When instructors are limited to teaching in aircraft for which they are rated, it ensures they can safely guide students through the complexities of flight instruction, thereby promoting a safer learning environment.

Additionally, each aircraft type can have unique handling and performance characteristics, and having the appropriate ratings ensures that the instructor can adequately prepare the student for real-world flying. This requirement also fosters a deeper understanding of the aircraft itself, enhancing the quality of instruction provided.