CH.VIII.E — Vortex Ring State (VRS)
CH.VIII.E for the Commercial Pilot Rotorcraft ACS: official objective, references, and 18 exact knowledge, risk-management, and skill descriptions.
FAA-S-ACS-16, November 2023. This study page does not replace the current FAA publication or an examiner's plan of action.
Official task context
| Certificate or rating | Commercial Pilot |
|---|---|
| Aircraft category | Rotorcraft |
| Area of operation | Area of Operation VIII. Emergency Operations |
| Task | Task E. Vortex Ring State (VRS) |
| Task code prefix | CH.VIII.E |
| Official references | FAA-H-8083-2, FAA-H-8083-21, FAA-H-8083-25; POH/RFM |
| FAA document | FAA-S-ACS-16 — Commercial Pilot for Rotorcraft Category Helicopter Rating Airman Certification Standards |
| FAA source library | Open the official ACS library |
Official task objective
To determine the applicant exhibits satisfactory knowledge, risk management, and skills associated with main rotor Vortex Ring State (VRS).
What the ACS code means
- CH identifies the ACS standard family used for this Commercial Pilot Rotorcraft document.
- VIII identifies Emergency Operations, the Area of Operation.
- E identifies Vortex Ring State (VRS), the Task within that Area.
- K, R, and S identify knowledge, risk-management, and skill elements. The number selects the item; a trailing lowercase letter identifies a listed sub-element.
Knowledge elements
| ACS code | Official description | How a mock oral can probe it |
|---|---|---|
| CH.VIII.E.K1 | Elements of vortex ring state. | Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant. |
| CH.VIII.E.K2 | Effects of wind, weight, temperature, and density altitude. | Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant. |
| CH.VIII.E.K3 | Requirements for the formation of VRS. | Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant. |
| CH.VIII.E.K4 | Aerodynamics and indications of VRS. | Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant. |
| CH.VIII.E.K5 | Flight scenarios under which VRS can occur. | Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant. |
| CH.VIII.E.K6 | Effective recovery techniques. | Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant. |
Risk management elements
| ACS code | Official description | How a mock oral can probe it |
|---|---|---|
| CH.VIII.E.R1 | Pilot recognition and response to VRS. | Work through a scenario by identifying the hazard, evaluating the risk, and explaining a practical mitigation or decision. |
| CH.VIII.E.R2 | Entering the maneuver at a lower altitude than planned. | Work through a scenario by identifying the hazard, evaluating the risk, and explaining a practical mitigation or decision. |
| CH.VIII.E.R3 | Application of power or exceeding powerplant limitations. | Work through a scenario by identifying the hazard, evaluating the risk, and explaining a practical mitigation or decision. |
| CH.VIII.E.R4 | Collision hazards. | Work through a scenario by identifying the hazard, evaluating the risk, and explaining a practical mitigation or decision. |
| CH.VIII.E.R5 | Distractions, task prioritization, loss of situational awareness, or disorientation. | Work through a scenario by identifying the hazard, evaluating the risk, and explaining a practical mitigation or decision. |
| CH.VIII.E.R6 | Loss of tail rotor effectiveness (LTE). | Work through a scenario by identifying the hazard, evaluating the risk, and explaining a practical mitigation or decision. |
Skills elements
| ACS code | Official description | How a mock oral can probe it |
|---|---|---|
| CH.VIII.E.S1 | Complete the appropriate checklist(s). | Describe the procedure, interpretation, or decision process that can be discussed during an oral. Physical aircraft performance remains part of the practical test. |
| CH.VIII.E.S2 | Clear the area. | Describe the procedure, interpretation, or decision process that can be discussed during an oral. Physical aircraft performance remains part of the practical test. |
| CH.VIII.E.S3 | Select an altitude that allows recovery to be completed no lower than 1,000 feet AGL or as recommended by the manufacturer, whichever is higher. | Describe the procedure, interpretation, or decision process that can be discussed during an oral. Physical aircraft performance remains part of the practical test. |
| CH.VIII.E.S4 | Establish conditions leading to VRS entry. | Describe the procedure, interpretation, or decision process that can be discussed during an oral. Physical aircraft performance remains part of the practical test. |
| CH.VIII.E.S5 | Promptly recognize, announce, and recover at the first indication of VRS. | Describe the procedure, interpretation, or decision process that can be discussed during an oral. Physical aircraft performance remains part of the practical test. |
| CH.VIII.E.S6 | Use single-pilot resource management (SRM) or crew resource management (CRM), as appropriate. | Describe the procedure, interpretation, or decision process that can be discussed during an oral. Physical aircraft performance remains part of the practical test. |
Difficulty data
Difficulty calibration is ongoing for this Task. A difficulty estimate is published only with a sufficiently large, privacy-preserving first directly recorded assessment sample. Any observed difficulty comes from Checkride AI mock-oral practice assessments and is a practice-data proxy, not an FAA practical-test pass or fail rate.
Difficulty calibration remains ongoing until an item clears the private reporting threshold. Percentages, when available, describe the share who needed review on their first directly recorded assessment. Underlying sample sizes are never published, and historical final states are not backfilled into this measure.
Official task notes
- Note: See Appendix 3: Aircraft, Equipment, and Operational Requirements & Limitations for information related to this Task.
How to use this in a mock oral
A mock examiner can ask you to explain the published elements, apply them to the configured aircraft and airport scenario, identify risks, and defend a decision. The prompts are practice scenarios; they are not claimed to be actual FAA examiner scripts or a prediction of the questions you will receive.
Related ACS tasks
- All Commercial Pilot Rotorcraft ACS tasks
51 task-level resources from FAA-S-ACS-16.
- CH.VIII.D — Systems and Equipment Malfunctions
Area of Operation VIII. Emergency Operations
- CH.VIII.F — Low Rotor Revolutions Per Minute (RPM) Recognition and Recovery
Area of Operation VIII. Emergency Operations
- CH.VIII.A — Powerplant Failure in a Hover in a Single-Engine Helicopter
Area of Operation VIII. Emergency Operations
- CH.VIII.B — Powerplant Failure at Altitude in a Single-Engine Helicopter
Area of Operation VIII. Emergency Operations
- CH.VIII.C — Approach and Landing with One Engine Inoperative (OEI) (Simulated) (Multiengine Helicopter Only)
Area of Operation VIII. Emergency Operations