- What the Eight Areas Actually Are
- IHR, IRH and Nearby Tests: Getting the Scope Right
- Domain 1: Preflight Preparation
- Domain 2: Preflight Procedures
- Domain 3: ATC Clearances and Procedures
- Domain 4: Flight by Reference to Instruments
- Domain 5: Navigation Systems
- Domain 6: Instrument Approach Procedures
- Domain 7: Emergency Operations
- Domain 8: Postflight Procedures
- Written Test Mechanics You Should Know
- Sequencing Your Preparation Around the Domains
- Frequently Asked Questions
- The eight domains are the FAA's Areas of Operation in the Instrument Rating - Helicopter ACS (FAA-S-ACS-14), not weighted written-test sections.
- The FAA IRH written test has 60 questions, a 2.0-hour limit, and a 70 passing score.
- No official percentage weights exist for the eight areas, so any claimed "heaviest domain" is guesswork.
- Passing the written test alone does not award the rating; a separate practical with an authorized evaluator or examiner is required.
What the Eight Areas Actually Are
Candidates often assume that eight content areas means eight slices of a written exam, each carrying a published percentage. For the Instrument-Helicopter Rating, that is not how the FAA structures things. The eight domains on this page are the Areas of Operation in the Instrument Rating - Helicopter Airman Certification Standards, FAA-S-ACS-14. The ACS integrates three things for every task: the knowledge you need, the risk management you apply, and the skill you demonstrate in the aircraft or approved device.
That has two practical consequences. First, the written knowledge test and the practical assessment both draw on the same standard, so material you learn for one carries into the other. Second, the FAA has not published weights or item allocations for these eight areas. You will see some prep sites imply that one domain dominates the exam. Nothing in the FAA's published materials supports that, so this guide does not rank domains by weight. For a broader strategy built on top of these areas, see our IHR study guide.
IHR, IRH and Nearby Tests: Getting the Scope Right
On this site, "IHR" is shorthand for the Instrument-Helicopter Rating issued by the Federal Aviation Administration. The FAA's own knowledge-test code is IRH (Instrument Rating Helicopter), and the standards document is titled Instrument Rating - Helicopter. If you are searching for FAA materials, use "IRH" and "Instrument Rating - Helicopter."
This is not the same as several tests with similar names:
- The Instrument Rating Airplane knowledge test.
- The Flight Instructor Instrument Helicopter test.
- The Canadian-conversion test (ICH).
- Any EASA or other non-U.S. IR(H) examination.
If you want the foundational definition first, start with What Is IHR? and then come back to the domain breakdown below. For prerequisites, see IHR requirements.
Domain 1: Preflight Preparation
The ACS groups three tasks here: pilot qualifications, weather information, and cross-country flight planning. This is where an instrument flight is won or lost before the rotors turn.
Pilot Qualifications
You must know what makes you legal and safe to fly IFR, which goes beyond holding a rating.
- Instrument currency under 14 CFR 61.57: in the preceding six calendar months, six approaches, holding procedures, and intercepting and tracking navigation courses, with the appropriate aircraft or device conditions.
- What happens if you slip beyond that window: a further six-calendar-month period, after which an instrument proficiency check is required.
- Personal risk assessment, including fatigue, stress and recent experience in actual instrument conditions.
Weather Information
Helicopters operate at lower altitudes and often in more varied terrain than airplanes, so weather interpretation carries extra weight.
- Interpreting reports, forecasts and graphical products to decide whether an IFR flight is sensible.
- Recognizing icing, convective activity and low-ceiling hazards, and how they affect a helicopter's options.
- Knowing when a legal flight is still a poor decision.
Cross-Country Flight Planning
Plan the route, the fuel, the alternates and the contingencies.
- Route selection, charts and publications, and performance and weight-and-balance for the helicopter you will fly.
- Fuel requirements and alternate planning under IFR.
- The rating-completion cross-country under 61.65: an instructed IFR-filed flight of at least 100 nautical miles, an instrument approach at each airport, and three different kinds of approaches using navigation systems.
Domain 2: Preflight Procedures
This area covers aircraft systems related to IFR operations, helicopter flight instruments and navigation equipment, and the instrument flight deck check. It is the area where candidates most often underestimate how much a helicopter differs from an airplane.
Systems, Instruments and the Flight Deck Check
- How your helicopter's electrical, hydraulic, fuel and flight control systems affect IFR operation, including what a failure does to your ability to continue.
- The principles and limitations of the gyroscopic, pitot-static and magnetic instruments, plus any autopilot, stability augmentation and avionics you will use.
- Confirming that the instruments and navigation equipment are working and appropriate before you commit to a flight in the system.
Understanding why an instrument fails, and how you would recognize it, feeds directly into the loss-of-primary-instruments scenario in Domain 7.
Domain 3: Air Traffic Control (ATC) Clearances and Procedures
Two tasks live here: compliance with ATC clearances and holding procedures. They look simple on paper and cause real workload problems in practice.
Clearances and Holding
- Copying, reading back and complying with clearances, including amendments, and knowing what to do when a clearance is unclear.
- Entering and flying holding patterns, including entry selection and wind correction.
- Maintaining situational awareness while communicating, which is a skill as much as a knowledge item.
Holding is also one of the three items in the 61.57 currency requirement, which makes it a recurring skill rather than a one-time checkride task.
Domain 4: Flight by Reference to Instruments
The ACS tasks here are instrument flight and recovery from unusual flight attitudes. This is the core of the rating: controlling a helicopter by instruments alone.
Instrument Flight and Unusual Attitudes
- Cross-checking, interpreting and controlling using the primary and supporting instruments.
- Understanding how helicopter handling affects instrument flying: inherent instability, workload and the effect of small control inputs.
- Recognizing and recovering from unusual attitudes safely, including disorientation awareness.
Domain 5: Navigation Systems
This area covers intercepting and tracking navigational systems and DME arcs, plus departure, en route and arrival operations.
Intercepting, Tracking and Terminal Operations
- Intercepting and tracking courses using the navigation systems you are trained on, including DME arcs.
- Flying published departure, en route and arrival procedures accurately.
- Monitoring and cross-checking navigation sources, and recognizing when your position or the information has gone wrong.
Modern glass-cockpit and GPS-based navigation changes the workload, but the ACS expects you to understand the underlying methods and limitations, not just to follow a magenta line. Intercepting and tracking is also a named component of instrument currency.
Domain 6: Instrument Approach Procedures
This is the largest area by task count and the one most associated with the practical. The four tasks are non-precision approach, precision approach, missed approach, and landing from an instrument approach.
Approaches, Missed Approaches and Landing
- Selecting, briefing and flying non-precision and precision approaches, with correct minimums and decision points.
- Executing a missed approach on time and to the published procedure.
- Transitioning from instrument to visual references for landing, including helicopter-specific considerations when the approach ends at a point in space or to a runway.
Approach selection also ties back to the 61.65 requirement for three different kinds of approaches using navigation systems during the cross-country. We do not claim this area carries the heaviest written-test weight, because the FAA does not publish area weights. It simply contains the most tasks in the ACS.
Domain 7: Emergency Operations
Three tasks: loss of communications, instrument approach and landing with an inoperative engine (simulated, multiengine helicopter only), and approach with loss of primary flight instrument indicators.
Abnormal and Emergency Scenarios
- Loss of communications: knowing the regulatory procedures and exercising sound judgment on route, altitude and approach.
- Approach with loss of primary flight instrument indicators: continuing safely with partial panel or alternate sources.
- Inoperative engine approach: applies only if you are training and testing in a multiengine helicopter. A single-engine candidate does not perform it.
Key Takeaway
The inoperative-engine task is conditional. Confirm with your evaluator which aircraft category your practical will use so you do not spend preparation time on a task that does not apply, or neglect one that does.
Domain 8: Postflight Procedures
The final area contains a single task: checking instruments and equipment. It is easy to overlook because it comes after the flight, but it reflects how the ACS views the whole IFR operation as a loop.
Checking Instruments and Equipment
- Noting any instrument or equipment discrepancies observed in flight and recording them correctly.
- Understanding how what you found feeds the next flight's airworthiness and risk decision.
Because it is a single short task, do not budget a lot of study time here, but do not skip it. It is a straightforward area to demonstrate cleanly in the oral portion.
Written Test Mechanics You Should Know
The domains describe what you must master. The knowledge test is a separate event with its own logistics.
| Item | What the FAA publishes |
|---|---|
| Test code | IRH (Instrument Rating Helicopter) |
| Questions | 60, plus unscored validation questions not disclosed |
| Time allowed | 2.0 hours (includes time for any unscored questions) |
| Passing score | 70 |
| Minimum age for the written test | 15 |
| Format | Computer-based, delivered at FAA-approved testing centers |
You may see a 2.5-hour figure in an older ACS appendix. The FAA's correction table and the current testing matrix both put the IRH allotment at 2.0 hours, and a publisher update confirmed the change. Work from 2.0 hours. For the scoring detail, see IHR passing score, and for scheduling, IHR exam dates.
To sit for the test you need a Federal Tracking Number from IACRA and acceptable identification. For a first attempt, the authorization is either a completion document from an FAA-certificated school's ground course or a readiness endorsement from an authorized instructor. A retest after a failure requires the failed test report and an endorsement after additional instruction. The test is not open book, though permitted calculators and navigation aids are allowed under proctor control. The FAA does not release live questions, so be wary of any source that claims to sell "actual" exam items.
On difficulty, the FAA's 2025 data reports 597 IRH tests with a 94.14% pass rate and an 84.47% average score. Those are test-administration figures, not a first-attempt or checkride rate. We discuss them in IHR pass rate and how hard the IHR exam is.
Sequencing Your Preparation Around the Domains
The ACS is not a study syllabus, but the logical order of flight gives you a sensible way to schedule preparation. Here is one example tied to the content above, not a prescription.
Domains 1 and 2
- Weather products, planning, and currency rules under 61.57.
- Systems and instruments for your specific helicopter.
Domains 3, 4 and 5
- Clearances, holding entries, and navigation interception and tracking.
- Instrument interpretation and unusual-attitude recovery concepts.
Domains 6, 7 and 8
- Approach types, minimums, missed approaches and the conditional emergency tasks.
- Take timed practice sets on the main IHR practice test site and review weak spots.
If you already hold an instrument rating in another aircraft category, 61.65(a)(7) exempts you from another knowledge test, but you still need the helicopter practical and experience. For quick end-of-study review, a condensed IHR cheat sheet can help, and our practice questions let you test recall under a realistic time limit.
Cost and value questions are separate from domain mastery. Written-test fees, tuition, aircraft time and examiner charges vary by school and region, so see IHR certification cost and whether the rating is worth it before you budget. The FAA does not publish a single universal booking price.
Frequently Asked Questions
No official weights were published. The eight domains are ACS Areas of Operation, not weighted written-test sections, so avoid sources that claim a specific percentage for each.
The current FAA testing matrix lists 60 questions and 2.0 hours, with a passing score of 70. Unscored validation questions may appear in addition to the published count, and the time allowance includes them.
No. You also need the experience required under 14 CFR 61.65 and a successful practical assessment with an authorized evaluator or designated pilot examiner.
Only if you are testing in a multiengine helicopter. The ACS marks that task as multiengine only, so single-engine candidates do not perform it.
No. The six-month figure relates to instrument currency under 61.57, not rating validity. Beyond the currency windows you need an instrument proficiency check to resume IFR privileges.