CH.II.C — Powerplant Starting and Rotor Engagement
CH.II.C for the Commercial Pilot Rotorcraft ACS: official objective, references, and 11 exact knowledge, risk-management, and skill descriptions.
FAA-S-ACS-16, November 2023. This study page does not replace the current FAA publication or an examiner's plan of action.
Official task context
| Certificate or rating | Commercial Pilot |
|---|---|
| Aircraft category | Rotorcraft |
| Area of operation | Area of Operation II. Preflight Procedures |
| Task | Task C. Powerplant Starting and Rotor Engagement |
| Task code prefix | CH.II.C |
| Official references | FAA-H-8083-2, FAA-H-8083-21, FAA-H-8083-25; POH/RFM |
| FAA document | FAA-S-ACS-16 — Commercial Pilot for Rotorcraft Category Helicopter Rating Airman Certification Standards |
| FAA source library | Open the official ACS library |
Official task objective
To determine the applicant exhibits satisfactory knowledge, risk management, and skills associated with recommended powerplant starting and rotor engagement procedures.
What the ACS code means
- CH identifies the ACS standard family used for this Commercial Pilot Rotorcraft document.
- II identifies Preflight Procedures, the Area of Operation.
- C identifies Powerplant Starting and Rotor Engagement, 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
| ACS code | Official description | How a mock oral can probe it |
|---|---|---|
| CH.II.C.K1 | Starting under various conditions. | Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant. |
| CH.II.C.K2 | Starting procedures, including the use of external power if applicable. | Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant. |
| CH.II.C.K3 | Limitations associated with starting. | Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant. |
| CH.II.C.K4 | Conditions leading to and procedures for an aborted start. | Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant. |
Risk management elements
| ACS code | Official description | How a mock oral can probe it |
|---|---|---|
| CH.II.C.R1 | Rotor engagement, if applicable. | Work through a scenario by identifying the hazard, evaluating the risk, and explaining a practical mitigation or decision. |
| CH.II.C.R2 | Use of external power unit. | Work through a scenario by identifying the hazard, evaluating the risk, and explaining a practical mitigation or decision. |
| CH.II.C.R3 | Limitations during starting. | Work through a scenario by identifying the hazard, evaluating the risk, and explaining a practical mitigation or decision. |
Skills elements
| ACS code | Official description | How a mock oral can probe it |
|---|---|---|
| CH.II.C.S1 | Position the helicopter properly considering structures, surface conditions, other aircraft, wind, and the safety of nearby persons and property. | Describe the procedure, interpretation, or decision process that can be discussed during an oral. Physical aircraft performance remains part of the practical test. |
| CH.II.C.S2 | Use flight control frictions, if required. | Describe the procedure, interpretation, or decision process that can be discussed during an oral. Physical aircraft performance remains part of the practical test. |
| CH.II.C.S3 | Complete 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. |
| CH.II.C.S4 | Engage and manage the rotor system, 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.
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.
Related ACS tasks
- All Commercial Pilot Rotorcraft ACS tasks
51 task-level resources from FAA-S-ACS-16.
- CH.II.B — Flight Deck Management
Area of Operation II. Preflight Procedures
- CH.II.D — Before Takeoff Check
Area of Operation II. Preflight Procedures
- CH.II.A — Preflight Assessment
Area of Operation II. Preflight Procedures