# CP.IX.D — Vortex Ring State (VRS) Avoidance — Commercial Pilot Powered Lift ACS

> CP.IX.D from FAA-S-ACS-2, including the official objective, references, notes, and 15 exact knowledge, risk-management, and skill descriptions.

Canonical HTML: [https://www.check-ride.ai/acs/powered-lift/commercial-pilot/cp-ix-d](https://www.check-ride.ai/acs/powered-lift/commercial-pilot/cp-ix-d)

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

## Official Task context

- FAA document: Commercial Pilot for Powered-Lift Category Airman Certification Standards
- Identifier: FAA-S-ACS-2
- Published source date: November 2023
- Aircraft category: Powered Lift
- Certificate or rating: Commercial Pilot
- Area of Operation: Area of Operation IX. Emergency Operations
- Task: Task D. Vortex Ring State (VRS) Avoidance
- Task code prefix: CP.IX.D
- Official references: FAA-H-8083-2, FAA-H-8083-25; Flight Manual
- FAA source library: https://www.faa.gov/training_testing/testing/acs

## Official Task objective

To determine the applicant exhibits satisfactory knowledge and risk management associated with

preventing the aircraft from entering and the procedure for recovering from Vortex Ring State (VRS).

## Knowledge elements

- **CP.IX.D.K1** — Elements of vortex ring state.
- **CP.IX.D.K2** — Effects of wind, weight, temperature, and density altitude.
- **CP.IX.D.K3** — Requirements for the formation of VRS.
- **CP.IX.D.K4** — Aircraft systems that aid the pilot in avoiding VRS, if applicable.
- **CP.IX.D.K5** — Aerodynamics and indications of VRS.
- **CP.IX.D.K6** — Flight scenarios under which VRS can occur.
- **CP.IX.D.K7** — Asymmetric VRS, if applicable.
- **CP.IX.D.K8** — Effective recovery techniques.
- **CP.IX.D.K9** — Control inputs and configuration changes to recover from VRS.

## Risk management elements

- **CP.IX.D.R1** — Conditions for entering VRS.
- **CP.IX.D.R2** — Pilot recognition and response to VRS.
- **CP.IX.D.R3** — Loss of control.
- **CP.IX.D.R4** — Collision hazards.
- **CP.IX.D.R5** — Distractions, task prioritization, loss of situational awareness, or disorientation.

## Skills elements

- **CP.IX.D.S1** — [Intentionally left blank].

## 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

- Evaluator assesses this Task orally only.

## 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.