# AA.I.C — Weather Information (ATP) — Airline Transport Pilot Airplane ACS

> AA.I.C from FAA-S-ACS-11A, including the official objective, references, notes, and 35 exact knowledge, risk-management, and skill descriptions.

Canonical HTML: [https://www.check-ride.ai/acs/airplane/airline-transport-pilot/aa-i-c](https://www.check-ride.ai/acs/airplane/airline-transport-pilot/aa-i-c)

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

## Official Task context

- FAA document: Airline Transport Pilot and Type Rating for Airplane Category Airman Certification Standards
- Identifier: FAA-S-ACS-11A
- Published source date: November 2023
- Aircraft category: Airplane
- Certificate or rating: Airline Transport Pilot
- Area of Operation: Area of Operation I. Preflight Preparation
- Task: Task C. Weather Information (ATP)
- Task code prefix: AA.I.C
- Official references: 14 CFR part 91; AC 61-107, AC 61-138, AC 91-74, AC 91-92; AIM; FAA-H-8083-2, FAA-H-8083-3, FAA-H-8083-16, FAA-H-8083-25, FAA-H-8083-28
- 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 obtaining, understanding, and applying weather information for a flight under IFR.

## Knowledge elements

- **AA.I.C.K1** — Sources of weather data (e.g., National Weather Service, Flight Service) for flight planning purposes.
- **AA.I.C.K2** — Acceptable weather products and resources required for preflight planning, current and forecast weather for departure, en route, and arrival phases of flight such as:
- **AA.I.C.K2a** — a. Airport Observations (METAR and SPECI) and Pilot Observations (PIREP)
- **AA.I.C.K2b** — b. Surface Analysis Chart, Ceiling and Visibility Chart (CVA)
- **AA.I.C.K2c** — c. Terminal Aerodrome Forecasts (TAF)
- **AA.I.C.K2d** — d. Graphical Forecasts for Aviation (GFA)
- **AA.I.C.K2e** — e. Wind and Temperature Aloft Forecast (FB)
- **AA.I.C.K2f** — f. Convective Outlook (AC)
- **AA.I.C.K2g** — g. Inflight Aviation Weather Advisories including Airmen's Meteorological Information (AIRMET), Significant Meteorological Information (SIGMET), and Convective SIGMET
- **AA.I.C.K3** — Meteorology applicable to the departure, en route, alternate, and destination for flights conducted under Instrument Flight Rules (IFR) to include expected climate and hazardous conditions such as:
- **AA.I.C.K3a** — a. Atmospheric composition and stability
- **AA.I.C.K3b** — b. Wind (e.g., windshear, mountain wave, factors affecting wind, etc.)
- **AA.I.C.K3c** — c. Temperature and heat exchange
- **AA.I.C.K3d** — d. Moisture/precipitation
- **AA.I.C.K3e** — e. Weather system formation, including air masses and fronts
- **AA.I.C.K3f** — f. Clouds
- **AA.I.C.K3g** — g. Turbulence
- **AA.I.C.K3h** — h. Thunderstorms and microbursts
- **AA.I.C.K3i** — i. Icing and freezing level information
- **AA.I.C.K3j** — j. Fog/mist
- **AA.I.C.K3k** — k. Frost
- **AA.I.C.K3l** — l. Obstructions to visibility (e.g., smoke, haze, volcanic ash, etc.)
- **AA.I.C.K4** — Flight deck displays of digital weather and aeronautical information, their use to navigate around weather, and equipment limitations.
- **AA.I.C.K5** — Low-visibility operations (e.g., surface movement, category II and III approaches). (ATP)(AMEL, AMES).
- **AA.I.C.K6** — Flight Risk Assessment Tools.

## Risk management elements

- **AA.I.C.R1** — Weather conditions involved in departure and in-flight decision making, to include:
- **AA.I.C.R1a** — a. Circumstances requiring a change in course or destination
- **AA.I.C.R1b** — b. Known or forecast icing, winds or turbulence aloft, volcanic ash, destination weather, etc.
- **AA.I.C.R1c** — c. Personal weather minimums
- **AA.I.C.R1d** — d. Operator specified or aircraft operational limitations, if applicable
- **AA.I.C.R2** — Use and limitations of:
- **AA.I.C.R2a** — a. Installed onboard weather equipment
- **AA.I.C.R2b** — b. Aviation weather reports and forecasts
- **AA.I.C.R2c** — c. Inflight weather resources

## Skills elements

- **AA.I.C.S1** — Interpret weather information, apply principles of aeronautical decision-making, and use a Flight Risk Assessment Tool, if available.

## 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: If K2 is selected, the evaluator must assess the applicant’s knowledge of at least three sub-elements.
- Note: If K3 is selected, the evaluator must assess the applicant’s knowledge of at least three sub-elements.
- Note: See Appendix 1: Practical Test Roles, Responsibilities, and Outcomes and 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.