# IL.II.F — Performance and Limitations — Flight Instructor Powered Lift ACS

> IL.II.F from FAA-S-ACS-27, including the official objective, references, notes, and 18 exact knowledge, risk-management, and skill descriptions.

Canonical HTML: [https://www.check-ride.ai/acs/powered-lift/flight-instructor/il-ii-f](https://www.check-ride.ai/acs/powered-lift/flight-instructor/il-ii-f)

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

## Official Task context

- FAA document: Flight Instructor for Powered-Lift Category Airman Certification Standards
- Identifier: FAA-S-ACS-27
- Published source date: November 2023
- Aircraft category: Powered Lift
- Certificate or rating: Flight Instructor
- Area of Operation: Area of Operation II. Technical Subject Areas
- Task: Task F. Performance and Limitations
- Task code prefix: IL.II.F
- Official references: FAA-H-8083-1, FAA-H-8083-2, FAA-H-8083-9, FAA-H-8083-25; Flight Manual
- FAA source library: https://www.faa.gov/training_testing/testing/acs

## Official Task objective

To determine the applicant understands aircraft performance and limitations, can apply that knowledge, manage associated risks, demonstrate appropriate skills, and provide effective instruction.

## Knowledge elements

- **IL.II.F.K1** — Elements related to performance and limitations by explaining the use of charts, tables, and data to determine performance.
- **IL.II.F.K2** — Factors affecting performance, including:
- **IL.II.F.K2a** — a. Atmospheric conditions
- **IL.II.F.K2b** — b. Pilot technique
- **IL.II.F.K2c** — c. Aircraft configuration
- **IL.II.F.K2d** — d. Airport, heliport, helipad, or unprepared surface environment
- **IL.II.F.K2e** — e. Loading and weight and balance
- **IL.II.F.K3** — Weight and balance terms, including: basic empty weight, maximum gross weight, arm, moment, reference datum, center of gravity (CG) and CG limits, and useful load.
- **IL.II.F.K4** — Methods for computing CG.
- **IL.II.F.K5** — Height/Velocity (H/V) diagram according to the flight manual.
- **IL.II.F.K6** — Aerodynamics.

## Risk management elements

- **IL.II.F.R1** — Use of performance charts, tables, and data.
- **IL.II.F.R2** — Aircraft limitations.
- **IL.II.F.R3** — Possible differences between calculated performance and actual performance.
- **IL.II.F.R4** — Operations within “avoid areas” of the H/V diagram.
- **IL.II.F.R5** — Other hazards specific to the powered-lift make and model.

## Skills elements

- **IL.II.F.S1** — Use of the appropriate manufacturer’s approved performance charts, tables, and data.
- **IL.II.F.S2** — Compute the weight and balance, correct out-of-center of gravity loading errors and determine if the weight and balance remains within limits during all phases of flight and aircraft configurations.

## 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.