Instrument Rating Airman Certification Standards - Federal Aviation Administration - Bog

The Airman Certification Standards (ACS) is the guide for aviation students, instructors, and FAA-designated examiners to know what pilot and industry license applicants must know, do, and consider for their FAA Knowledge Exam and practical (checkride) to earn a certificate or rating. The new ACS (effective June 2018) replaces the Practical Test Standards (PTS) and it is basically an enhanced version of the PTS. It adds task-specific knowledge and risk management elements to each PTS "Area of Operation" and "Task."
This Federal Aviation Administration (FAA) Instrument Rating - Airplane ACS provides the aeronautical knowledge, risk management, and flight proficiency standards for instrument rating certification in the airplane category, single-engine land and sea, as well as multi-engine land and sea classes.