Definition
The FAA publication that sets the official knowledge, risk management, and flight proficiency standards a pilot must meet to be issued an instrument rating, and that examiners use as the basis for the instrument rating practical test (checkride). It also serves as the reference document for instrument proficiency checks (IPCs), specifying the tasks and performance standards an instrument-rated pilot must demonstrate to remain current and proficient.
Plain English
It is the FAA's official rulebook that lists exactly what a pilot has to know and be able to do to earn (or keep current) an instrument rating. Examiners and instructors use it as the checklist for testing.
Context Anchor
Seen when preparing for an instrument rating practical test, planning instrument training, or conducting an instrument proficiency check.
Derivation
Airman Certification Standards replaced the older Practical Test Standards (PTS) in 2016. The change added explicit knowledge and risk management elements alongside the existing flight skill standards, so the document covers what a pilot must know, manage, and do — not just fly.
Why Pilots Care
It sets the exact standards a pilot must meet during an IPC or instrument checkride, directly affecting legal currency and safety in instrument conditions.
Intuition Check
Do not read rating as a score or review. In FAA use, a rating is an added privilege on a pilot certificate; the Instrument Rating ACS is the standard for that instrument-flying privilege.
Example Sentence 1
Before the checkride, the applicant reviewed each task in the Instrument Rating ACS to confirm she could meet the listed tolerances.
Example Sentence 2
The instructor aligned lesson plans with the Instrument Rating ACS so the student would be ready for the checkride.