# IH.II.A — Aircraft Systems Related to Instrument Flight Rules (IFR) Operations — Instrument Rating Rotorcraft ACS

> IH.II.A from FAA-S-ACS-14, including the official objective, references, notes, and 7 exact knowledge, risk-management, and skill descriptions.

Canonical HTML: [https://www.check-ride.ai/acs/rotorcraft/instrument-rating/ih-ii-a](https://www.check-ride.ai/acs/rotorcraft/instrument-rating/ih-ii-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 II. Preflight Procedures
- Task: Task A. Aircraft Systems Related to Instrument Flight Rules (IFR) Operations
- Task code prefix: IH.II.A
- Official references: 14 CFR part 91; AC 91-74; FAA-H-8083-2, FAA-H-8083-15, 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 anti-icing or deicing systems, and other systems related to IFR flight.

## Knowledge elements

- **IH.II.A.K1** — The general operational characteristics and limitations of applicable anti-icing and deicing systems, including airframe, rotor, intake, fuel, and pitot-static systems.
- **IH.II.A.K2** — Flight control systems.

## Risk management elements

- **IH.II.A.R1** — Operations in icing conditions.
- **IH.II.A.R2** — Limitations of anti-icing and deicing systems.
- **IH.II.A.R3** — Use of automated systems in instrument conditions.

## Skills elements

- **IH.II.A.S1** — Demonstrate familiarity with anti-icing or deicing procedures or information published by the manufacturer specific to the helicopter used on the practical test.
- **IH.II.A.S2** — Demonstrate familiarity with the automatic flight control system (AFCS) procedures or information published by the manufacturer specific to the aircraft used on the practical test, if 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.