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AI.II.P — One Engine Inoperative (OEI) Performance (AMEL, AMES)

AI.II.P for the Flight Instructor Airplane ACS: official objective, references, and 16 exact knowledge, risk-management, and skill descriptions.

FAA-S-ACS-25, November 2023. This study page does not replace the current FAA publication or an examiner's plan of action.

Official task context

AI.II.P official ACS context
Certificate or ratingFlight Instructor
Aircraft categoryAirplane
Area of operationArea of Operation II. Technical Subject Areas
TaskTask P. One Engine Inoperative (OEI) Performance (AMEL, AMES)
Task code prefixAI.II.P
Official referencesFAA-H-8083-2, FAA-H-8083-3, FAA-H-8083-9, FAA-H-8083-25; FAA-P-8740-66; POH/AFM
FAA documentFAA-S-ACS-25 — Flight Instructor for Airplane Category Airman Certification Standards
FAA source libraryOpen the official ACS library

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.

What the ACS code means

  • AI identifies the ACS standard family used for this Flight Instructor Airplane document.
  • II identifies Technical Subject Areas, the Area of Operation.
  • P identifies One Engine Inoperative (OEI) Performance (AMEL, AMES), the Task within that Area.
  • K, R, and S identify knowledge, risk-management, and skill elements. The number selects the item; a trailing lowercase letter identifies a listed sub-element.

Knowledge elements

Official ACS knowledge items and mock-oral treatment
ACS codeOfficial descriptionHow a mock oral can probe it
AI.II.P.K1Proficient use of appropriate performance charts, tables, graphs, or other data to determine airplane performance and limitations for all phases of flight.Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant.
AI.II.P.K2Effects of exceeding limitations.Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant.
AI.II.P.K3Effects of atmospheric conditions on performance.Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant.
AI.II.P.K4Factors to be considered to determine required performance is within the airplane's single and multiengine cababilities.Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant.
AI.II.P.K5Aerodynamics of OEI operation including:Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant.
AI.II.P.K5aCritical engineExplain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant.
AI.II.P.K5bEffects of bank angle on VMCExplain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant.
AI.II.P.K5cZero side slipExplain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant.
AI.II.P.K5dReasons for loss of directional controlExplain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant.
AI.II.P.K6The relationship between minimum control speed (VMC) and stall speed and the effect of density altitude on that relationship.Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant.
AI.II.P.K7How to determine the best course of action after an engine failure.Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant.

Risk management elements

Official ACS risk management items and mock-oral treatment
ACS codeOfficial descriptionHow a mock oral can probe it
AI.II.P.R1Exceeding the critical angle of attack.Work through a scenario by identifying the hazard, evaluating the risk, and explaining a practical mitigation or decision.
AI.II.P.R2Loss of directional control.Work through a scenario by identifying the hazard, evaluating the risk, and explaining a practical mitigation or decision.
AI.II.P.R3Flying over terrain that exceeds the single engine service ceiling.Work through a scenario by identifying the hazard, evaluating the risk, and explaining a practical mitigation or decision.
AI.II.P.R4Fuel management.Work through a scenario by identifying the hazard, evaluating the risk, and explaining a practical mitigation or decision.

Skills elements

Official ACS skills items and mock-oral treatment
ACS codeOfficial descriptionHow a mock oral can probe it
AI.II.P.S1Compute the expected single engine climb performance.Describe the procedure, interpretation, or decision process that can be discussed during an oral. Physical aircraft performance remains part of the practical test.

Difficulty data

Difficulty calibration is ongoing for this Task. A difficulty estimate is published only with a sufficiently large, privacy-preserving first directly recorded assessment sample. Any observed difficulty comes from Checkride AI mock-oral practice assessments and is a practice-data proxy, not an FAA practical-test pass or fail rate.

Difficulty calibration remains ongoing until an item clears the private reporting threshold. Percentages, when available, describe the share who needed review on their first directly recorded assessment. Underlying sample sizes are never published, and historical final states are not backfilled into this measure.

How to use this in a mock oral

A mock examiner can ask you to explain the published elements, apply them to the configured aircraft and airport scenario, identify risks, and defend a decision. The prompts are practice scenarios; they are not claimed to be actual FAA examiner scripts or a prediction of the questions you will receive.

Practice in a mock oral

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