# IH.IV.A — Instrument Flight — Instrument Rating Rotorcraft ACS

> IH.IV.A from FAA-S-ACS-14, including the official objective, references, notes, and 8 exact knowledge, risk-management, and skill descriptions.

Canonical HTML: [https://www.check-ride.ai/acs/rotorcraft/instrument-rating/ih-iv-a](https://www.check-ride.ai/acs/rotorcraft/instrument-rating/ih-iv-a)

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

## Official Task context

- FAA document: Instrument Rating – Helicopter Airman Certification Standards
- Identifier: FAA-S-ACS-14
- Published source date: November 2023
- Aircraft category: Rotorcraft
- Certificate or rating: Instrument Rating
- Area of Operation: Area of Operation IV. Flight by Reference to Instruments
- Task: Task A. Instrument Flight
- Task code prefix: IH.IV.A
- Official references: FAA-H-8083-2, FAA-H-8083-15, FAA-H-8083-16, FAA-H-8083-21, FAA-H-8083-25
- 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 performing basic flight maneuvers solely by reference to instruments.

## Knowledge elements

- **IH.IV.A.K1** — Elements related to attitude instrument flying during straight-and-level flight, climbs, turns, and descents while conducting various instrument flight procedures.
- **IH.IV.A.K2** — Interpretation, operation, and limitations of pitch, bank, and power instruments.
- **IH.IV.A.K3** — Normal and abnormal instrument indications and operations.

## Risk management elements

- **IH.IV.A.R1** — Situations that can affect physiology and degrade instrument cross-check.
- **IH.IV.A.R2** — Spatial disorientation and optical illusions.
- **IH.IV.A.R3** — Flying unfamiliar helicopter or operating with unfamiliar flight display systems and avionics.

## Skills elements

- **IH.IV.A.S1** — Maintain altitude ±100 feet during level flight, selected headings ±10°, airspeed ±10 knots, and bank angles ±5° during turns.
- **IH.IV.A.S2** — Use proper instrument cross-check and interpretation, and apply the appropriate pitch, bank, power, and trim corrections when applicable.

## 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.

## 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.