What must a Certified Flight Instructor teach according to the ACS?

The correct response emphasizes the comprehensive nature of the ACS (Airman Certification Standards) for Certified Flight Instructors. The ACS outlines the knowledge and skills necessary for pilot certification, detailing a range of topics that an instructor must cover. This includes not only specific flight maneuvers and operational safety but also an understanding of aircraft systems and various other relevant subjects.

Teaching everything outlined in the ACS ensures that students are well-prepared for their flying careers and knowledgeable about all aspects needed for safe and effective flight. This holistic approach is vital to developing students into proficient and competent pilots, as every component contributes to their overall training and safety in aviation.

In contrast, focusing solely on operational safety, flight maneuvers, or aircraft systems would limit the instruction to only parts of the necessary knowledge base, failing to ensure that the student meets the overall competency required for certification. The comprehensive nature of the ACS mandates that instructors address the full spectrum of topics essential for an aspiring pilot's education.