# CH.VIII.E — Vortex Ring State (VRS) — Commercial Pilot Rotorcraft ACS

> CH.VIII.E from FAA-S-ACS-16, including the official objective, references, notes, and 18 exact knowledge, risk-management, and skill descriptions.

Canonical HTML: [https://www.check-ride.ai/acs/rotorcraft/commercial-pilot/ch-viii-e](https://www.check-ride.ai/acs/rotorcraft/commercial-pilot/ch-viii-e)

Site reference: [https://www.check-ride.ai/llms.txt](https://www.check-ride.ai/llms.txt)

## Official Task context

- FAA document: Commercial Pilot for Rotorcraft Category Helicopter Rating Airman Certification Standards
- Identifier: FAA-S-ACS-16
- Published source date: November 2023
- Aircraft category: Rotorcraft
- Certificate or rating: Commercial Pilot
- 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 source library: https://www.faa.gov/training_testing/testing/acs

## Official Task objective

To determine the applicant exhibits satisfactory knowledge, risk management, and skills associated with main rotor Vortex Ring State (VRS).

## Knowledge elements

- **CH.VIII.E.K1** — Elements of vortex ring state.
- **CH.VIII.E.K2** — Effects of wind, weight, temperature, and density altitude.
- **CH.VIII.E.K3** — Requirements for the formation of VRS.
- **CH.VIII.E.K4** — Aerodynamics and indications of VRS.
- **CH.VIII.E.K5** — Flight scenarios under which VRS can occur.
- **CH.VIII.E.K6** — Effective recovery techniques.

## Risk management elements

- **CH.VIII.E.R1** — Pilot recognition and response to VRS.
- **CH.VIII.E.R2** — Entering the maneuver at a lower altitude than planned.
- **CH.VIII.E.R3** — Application of power or exceeding powerplant limitations.
- **CH.VIII.E.R4** — Collision hazards.
- **CH.VIII.E.R5** — Distractions, task prioritization, loss of situational awareness, or disorientation.
- **CH.VIII.E.R6** — Loss of tail rotor effectiveness (LTE).

## Skills elements

- **CH.VIII.E.S1** — Complete the appropriate checklist(s).
- **CH.VIII.E.S2** — Clear the area.
- **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.
- **CH.VIII.E.S4** — Establish conditions leading to VRS entry.
- **CH.VIII.E.S5** — Promptly recognize, announce, and recover at the first indication of VRS.
- **CH.VIII.E.S6** — Use single-pilot resource management (SRM) or crew resource management (CRM), as appropriate.

## Difficulty methodology

Difficulty calibration is ongoing for this Task. Observed difficulty is a privacy-thresholded check-ride.ai mock-oral practice proxy, not an FAA practical-test pass or fail rate. Underlying sample sizes and the private reporting threshold are not published.

## Official Task notes

- Note: See Appendix 3: Aircraft, Equipment, and Operational Requirements & Limitations for information related to this Task.

## Use in practice

A mock examiner can ask a pilot to explain the published elements, apply them to the configured aircraft and airport context, identify risks, and defend a decision. Practice prompts are not represented as actual FAA examiner scripts or predictions of the questions a candidate will receive.