# IR.II.B — Aircraft Flight Instruments and Navigation Equipment — Instrument Rating Airplane ACS

> IR.II.B from FAA-S-ACS-8C, including the official objective, references, notes, and 16 exact knowledge, risk-management, and skill descriptions.

Canonical HTML: [https://www.check-ride.ai/acs/airplane/instrument-rating/ir-ii-b](https://www.check-ride.ai/acs/airplane/instrument-rating/ir-ii-b)

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

## Official Task context

- FAA document: Instrument Rating – Airplane Airman Certification Standards
- Identifier: FAA-S-ACS-8C
- Published source date: November 2023
- Aircraft category: Airplane
- Certificate or rating: Instrument Rating
- Area of Operation: Area of Operation II. Preflight Procedures
- Task: Task B. Aircraft Flight Instruments and Navigation Equipment
- Task code prefix: IR.II.B
- Official references: 14 CFR part 91; AC 90-100, AC 90-105, AC 90-107, AC 91-78, AC 91.21-1; AIM; FAA-H-8083-2, FAA-H-8083-3, FAA-H-8083-15, 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 managing instruments appropriate for an IFR flight.

## Knowledge elements

- **IR.II.B.K1** — Operation of the aircraft’s applicable flight instrument system(s), including:
- **IR.II.B.K1a** — a. Pitot-static instrument system and associated instruments
- **IR.II.B.K1b** — b. Gyroscopic/electric/vacuum instrument system and associated instruments
- **IR.II.B.K1c** — c. Electrical systems, electronic flight instrument displays [primary flight display (PFD), multifunction display (MFD)], transponder and automatic dependent surveillance - broadcast (ADS-B)
- **IR.II.B.K1d** — d. Magnetic compass
- **IR.II.B.K2** — Operation of the aircraft’s applicable navigation system(s), including:
- **IR.II.B.K2a** — a. Very high frequency (VHF) Omnidirectional Range (VOR), distance measuring equipment (DME), instrument landing system (ILS), marker beacon receiver/indicators
- **IR.II.B.K2b** — b. Area navigation (RNAV), global positioning system (GPS), Wide Area Augmentation System (WAAS), flight management system (FMS), autopilot
- **IR.II.B.K3** — Use of an electronic flight bag (EFB), if used.

## Risk management elements

- **IR.II.B.R1** — Monitoring and management of automated systems.
- **IR.II.B.R2** — Difference between approved and non-approved navigation devices.
- **IR.II.B.R3** — Modes of flight and navigation instruments, including failure conditions.
- **IR.II.B.R4** — Use of an electronic flight bag.
- **IR.II.B.R5** — Use of navigation databases.

## Skills elements

- **IR.II.B.S1** — Operate and manage installed instruments and navigation equipment.
- **IR.II.B.S2** — Operate and manage an applicant supplied electronic flight bag (EFB), if used.

## 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.