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CA.X.C — One Engine Inoperative (Simulated) (solely by Reference to Instruments) During Straight-and-Level Flight and Turns (AMEL, AMES)

CA.X.C for the Commercial Pilot Airplane ACS: official objective, references, and 17 exact knowledge, risk-management, and skill descriptions.

FAA-S-ACS-7B, November 2023. This study page does not replace the current FAA publication or an examiner's plan of action.

Official task context

CA.X.C official ACS context
Certificate or ratingCommercial Pilot
Aircraft categoryAirplane
Area of operationArea of Operation X. Multiengine Operations
TaskTask C. One Engine Inoperative (Simulated) (solely by Reference to Instruments) During Straight-and-Level Flight and Turns (AMEL, AMES)
Task code prefixCA.X.C
Official referencesFAA-H-8083-2, FAA-H-8083-3, FAA-H-8083-15, FAA-H-8083-25; FAA-P-8740-66; POH/AFM
FAA documentFAA-S-ACS-7B — Commercial Pilot for Airplane Category Airman Certification Standards
FAA source libraryOpen the official ACS library

Official task objective

To determine the applicant exhibits satisfactory knowledge, risk management, and skills associated with flight solely by reference to instruments with one engine inoperative.

What the ACS code means

  • CA identifies the ACS standard family used for this Commercial Pilot Airplane document.
  • X identifies Multiengine Operations, the Area of Operation.
  • C identifies One Engine Inoperative (Simulated) (solely by Reference to Instruments) During Straight-and-Level Flight and Turns (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
CA.X.C.K1Procedures used if engine failure occurs during straight-and-level flight and turns while on instruments.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
CA.X.C.R1Identification of the inoperative engine.Work through a scenario by identifying the hazard, evaluating the risk, and explaining a practical mitigation or decision.
CA.X.C.R2Inability to climb or maintain altitude with an inoperative engine.Work through a scenario by identifying the hazard, evaluating the risk, and explaining a practical mitigation or decision.
CA.X.C.R3Low 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.
CA.X.C.R4Distractions, 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.
CA.X.C.R5Fuel management during single-engine operation.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
CA.X.C.S1Promptly recognize an engine failure and maintain positive aircraft control.Describe the procedure, interpretation, or decision process that can be discussed during an oral. Physical aircraft performance remains part of the practical test.
CA.X.C.S2Set the engine controls, reduce drag, identify and verify the inoperative engine, and simulate feathering of the propeller on the inoperative engine (evaluator should then establish zero thrust on the inoperative engine).Describe the procedure, interpretation, or decision process that can be discussed during an oral. Physical aircraft performance remains part of the practical test.
CA.X.C.S3Establish the best engine-inoperative airspeed and trim the airplane.Describe the procedure, interpretation, or decision process that can be discussed during an oral. Physical aircraft performance remains part of the practical test.
CA.X.C.S4Use 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.
CA.X.C.S5Verify the prescribed checklist procedures used for securing the inoperative engine.Describe the procedure, interpretation, or decision process that can be discussed during an oral. Physical aircraft performance remains part of the practical test.
CA.X.C.S6Attempt 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.
CA.X.C.S7Monitor engine functions 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.
CA.X.C.S8Maintain the specified altitude ±100 feet or minimum sink rate if applicable, airspeed ±10 knots, and the specified heading ±10°.Describe the procedure, interpretation, or decision process that can be discussed during an oral. Physical aircraft performance remains part of the practical test.
CA.X.C.S9Assess the aircraft’s performance capability and decide an appropriate action to ensure a safe landing.Describe the procedure, interpretation, or decision process that can be discussed during an oral. Physical aircraft performance remains part of the practical test.
CA.X.C.S10Avoid loss of airplane control or attempted flight contrary to the engine-inoperative operating limitations of the airplane.Describe the procedure, interpretation, or decision process that can be discussed during an oral. Physical aircraft performance remains part of the practical test.
CA.X.C.S11Use single-pilot resource management (SRM) or crew resource management (CRM), as appropriate.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

  • See Appendix 2: Safety of Flight and Appendix 3: Aircraft, Equipment, and Operational Requirements & Limitations for information related to this Task.

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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