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CP.IX.C — Inflight Powerplant(s) Failure and Restart in Multi-Powerplant Aircraft

CP.IX.C for the Commercial Pilot Powered Lift ACS: official objective, references, and 21 exact knowledge, risk-management, and skill descriptions.

FAA-S-ACS-2, November 2023. This study page does not replace the current FAA publication or an examiner's plan of action.

Official task context

CP.IX.C official ACS context
Certificate or ratingCommercial Pilot
Aircraft categoryPowered Lift
Area of operationArea of Operation IX. Emergency Operations
TaskTask C. Inflight Powerplant(s) Failure and Restart in Multi-Powerplant Aircraft
Task code prefixCP.IX.C
Official referencesFAA-H-8083-2, FAA-H-8083-25; Flight Manual
FAA documentFAA-S-ACS-2 — Commercial Pilot for Powered-Lift 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 an inflight powerplant(s) failure and restart, if applicable, in a multi-powerplant powered-lift aircraft.

What the ACS code means

  • CP identifies the ACS standard family used for this Commercial Pilot Powered Lift document.
  • IX identifies Emergency Operations, the Area of Operation.
  • C identifies Inflight Powerplant(s) Failure and Restart in Multi-Powerplant Aircraft, 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
CP.IX.C.K1Flight characteristics and controllability associated with maneuvering the aircraft with powerplant(s) inoperative, including the importance of drag reduction and appropriate aircraft configuration.Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant.
CP.IX.C.K2Aircraft/powerplant limitations.Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant.
CP.IX.C.K3Powerplant restart procedures and conditions where a restart attempt is appropriate.Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant.
CP.IX.C.K4Causes of asymmetric thrust conditions and appropriate responses.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
CP.IX.C.R1Potential powerplant(s) failure during flight.Work through a scenario by identifying the hazard, evaluating the risk, and explaining a practical mitigation or decision.
CP.IX.C.R2Following checklist procedures for a powerplant(s) failure or a powerplant(s) restart.Work through a scenario by identifying the hazard, evaluating the risk, and explaining a practical mitigation or decision.
CP.IX.C.R3Identifying the powerplant(s) that failed.Work through a scenario by identifying the hazard, evaluating the risk, and explaining a practical mitigation or decision.
CP.IX.C.R4Collision hazards.Work through a scenario by identifying the hazard, evaluating the risk, and explaining a practical mitigation or decision.
CP.IX.C.R5Aircraft configuration.Work through a scenario by identifying the hazard, evaluating the risk, and explaining a practical mitigation or decision.
CP.IX.C.R6Factors and situations that could lead to loss of control with an inflight powerplant(s) failure.Work through a scenario by identifying the hazard, evaluating the risk, and explaining a practical mitigation or decision.
CP.IX.C.R7Distractions, 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
CP.IX.C.S1Recognize and correctly identify powerplant(s) failure, complete memory items (if applicable), 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.
CP.IX.C.S2Coordinate with crew, if applicable, and complete the appropriate emergency procedures and checklist(s) for powerplant shutdown.Describe the procedure, interpretation, or decision process that can be discussed during an oral. Physical aircraft performance remains part of the practical test.
CP.IX.C.S3Use flight controls and configure the aircraft 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.
CP.IX.C.S4Determine the cause for the powerplant(s) failure and if a restart is a viable option.Describe the procedure, interpretation, or decision process that can be discussed during an oral. Physical aircraft performance remains part of the practical test.
CP.IX.C.S5Maintain the operating powerplant(s) within acceptable operating limits.Describe the procedure, interpretation, or decision process that can be discussed during an oral. Physical aircraft performance remains part of the practical test.
CP.IX.C.S6Maintain the airspeed ±10 knots, the specified heading ±10°, and altitude ±100 feet as specified by the evaluator and within the aircraft’s capability.Describe the procedure, interpretation, or decision process that can be discussed during an oral. Physical aircraft performance remains part of the practical test.
CP.IX.C.S7Consider a powerplant restart and, if appropriate, demonstrate the powerplant restart procedures in accordance with the manufacturer or operator specified procedures and checklists.Describe the procedure, interpretation, or decision process that can be discussed during an oral. Physical aircraft performance remains part of the practical test.
CP.IX.C.S8Select the nearest suitable airport or landing area.Describe the procedure, interpretation, or decision process that can be discussed during an oral. Physical aircraft performance remains part of the practical test.
CP.IX.C.S9Communicate with air traffic control (ATC) and the evaluator, as appropriate for the situation.Describe the procedure, interpretation, or decision process that can be discussed during an oral. Physical aircraft performance remains part of the practical test.
CP.IX.C.S10Use 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

  • Note: 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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