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AI.XIII.A — Maneuvering with One Engine Inoperative (AMEL, AMES)

AI.XIII.A for the Flight Instructor Airplane ACS: official objective, references, and 20 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.XIII.A official ACS context
Certificate or ratingFlight Instructor
Aircraft categoryAirplane
Area of operationArea of Operation XIII. Multiengine Operations
TaskTask A. Maneuvering with One Engine Inoperative (AMEL, AMES)
Task code prefixAI.XIII.A
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 one engine inoperative, 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.
  • XIII identifies Multiengine Operations, the Area of Operation.
  • A identifies Maneuvering with One Engine Inoperative (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.XIII.A.K1Factors affecting minimum controllable speed (VMC).Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant.
AI.XIII.A.K2VMC (red line) and best single-engine rate of climb airspeed (VYSE) (blue line).Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant.
AI.XIII.A.K3How to identify, verify, feather, and secure an inoperative engine.Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant.
AI.XIII.A.K4Importance of drag reduction, including propeller feathering, gear and flap retraction, the manufacturer’s recommended control input and its relation to zero sideslip.Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant.
AI.XIII.A.K5Feathering, securing, unfeathering, and restarting.Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant.
AI.XIII.A.K6Common errors related to this Task.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.XIII.A.R1Potential engine failure during flight.Work through a scenario by identifying the hazard, evaluating the risk, and explaining a practical mitigation or decision.
AI.XIII.A.R2Collision hazards.Work through a scenario by identifying the hazard, evaluating the risk, and explaining a practical mitigation or decision.
AI.XIII.A.R3Configuring the airplane.Work through a scenario by identifying the hazard, evaluating the risk, and explaining a practical mitigation or decision.
AI.XIII.A.R4Low altitude maneuvering, including stall, spin, or controlled flight into terrain (CFIT).Work through a scenario by identifying the hazard, evaluating the risk, and explaining a practical mitigation or decision.
AI.XIII.A.R5Distractions, task prioritization, loss of situational awareness, or disorientation.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.XIII.A.S1Recognize an engine failure, maintain control, use manufacturer’s memory item procedures, and use appropriate emergency procedures.Describe the procedure, interpretation, or decision process that can be discussed during an oral. Physical aircraft performance remains part of the practical test.
AI.XIII.A.S2Set the engine controls, identify and verify the inoperative engine, and feather the appropriate propeller.Describe the procedure, interpretation, or decision process that can be discussed during an oral. Physical aircraft performance remains part of the practical test.
AI.XIII.A.S3Use flight controls in the proper combination as recommended by the manufacturer, or as required to maintain best performance, and trim as required.Describe the procedure, interpretation, or decision process that can be discussed during an oral. Physical aircraft performance remains part of the practical test.
AI.XIII.A.S4Attempt to determine and resolve the reason for the engine failure.Describe the procedure, interpretation, or decision process that can be discussed during an oral. Physical aircraft performance remains part of the practical test.
AI.XIII.A.S5Secure the inoperative engine and monitor the operating engine and make necessary adjustments.Describe the procedure, interpretation, or decision process that can be discussed during an oral. Physical aircraft performance remains part of the practical test.
AI.XIII.A.S6Restart the inoperative engine using manufacturer’s restart procedures.Describe the procedure, interpretation, or decision process that can be discussed during an oral. Physical aircraft performance remains part of the practical test.
AI.XIII.A.S7Maintain altitude ±100 feet or minimum sink rate if applicable, airspeed ±10 knots, and selected headings ±10°.Describe the procedure, interpretation, or decision process that can be discussed during an oral. Physical aircraft performance remains part of the practical test.
AI.XIII.A.S8Complete the appropriate checklist(s).Describe the procedure, interpretation, or decision process that can be discussed during an oral. Physical aircraft performance remains part of the practical test.
AI.XIII.A.S9Analyze and correct common errors related to this Task.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.

Official task notes

  • Note: See Appendix 2: Safety of Flight.

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

Related ACS tasks