# AI.II.P — One Engine Inoperative (OEI) Performance (AMEL, AMES) — Flight Instructor Airplane ACS

> AI.II.P from FAA-S-ACS-25, including the official objective, references, notes, and 16 exact knowledge, risk-management, and skill descriptions.

Canonical HTML: [https://www.check-ride.ai/acs/airplane/flight-instructor/ai-ii-p](https://www.check-ride.ai/acs/airplane/flight-instructor/ai-ii-p)

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

## Official Task context

- FAA document: Flight Instructor for Airplane Category Airman Certification Standards
- Identifier: FAA-S-ACS-25
- Published source date: November 2023
- Aircraft category: Airplane
- Certificate or rating: Flight Instructor
- Area of Operation: Area of Operation II. Technical Subject Areas
- Task: Task P. One Engine Inoperative (OEI) Performance (AMEL, AMES)
- Task code prefix: AI.II.P
- Official references: FAA-H-8083-2, FAA-H-8083-3, FAA-H-8083-9, FAA-H-8083-25; FAA-P-8740-66; POH/AFM
- FAA source library: https://www.faa.gov/training_testing/testing/acs

## Official Task objective

To determine the applicant understands elements related to multiengine performance, can apply that knowledge, manage associated risks, demonstrate appropriate skills, and provide effective instruction.

## Knowledge elements

- **AI.II.P.K1** — Proficient use of appropriate performance charts, tables, graphs, or other data to determine airplane performance and limitations for all phases of flight.
- **AI.II.P.K2** — Effects of exceeding limitations.
- **AI.II.P.K3** — Effects of atmospheric conditions on performance.
- **AI.II.P.K4** — Factors to be considered to determine required performance is within the airplane's single and multiengine cababilities.
- **AI.II.P.K5** — Aerodynamics of OEI operation including:
- **AI.II.P.K5a** — Critical engine
- **AI.II.P.K5b** — Effects of bank angle on VMC
- **AI.II.P.K5c** — Zero side slip
- **AI.II.P.K5d** — Reasons for loss of directional control
- **AI.II.P.K6** — The relationship between minimum control speed (VMC) and stall speed and the effect of density altitude on that relationship.
- **AI.II.P.K7** — How to determine the best course of action after an engine failure.

## Risk management elements

- **AI.II.P.R1** — Exceeding the critical angle of attack.
- **AI.II.P.R2** — Loss of directional control.
- **AI.II.P.R3** — Flying over terrain that exceeds the single engine service ceiling.
- **AI.II.P.R4** — Fuel management.

## Skills elements

- **AI.II.P.S1** — Compute the expected single engine climb performance.

## 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.