PH.VIII.I — Ground Resonance
PH.VIII.I for the Private Pilot Rotorcraft ACS: official objective, references, and 10 exact knowledge, risk-management, and skill descriptions.
FAA-S-ACS-15, 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 | Private Pilot |
|---|---|
| Aircraft category | Rotorcraft |
| Area of operation | Area of Operation VIII. Emergency Operations |
| Task | Task I. Ground Resonance |
| Task code prefix | PH.VIII.I |
| Official references | FAA-H-8083-2, FAA-H-8083-21, FAA-H-8083-25; POH/RFM |
| FAA document | FAA-S-ACS-15 — Private 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 and risk management associated with ground resonance.
What the ACS code means
- PH identifies the ACS standard family used for this Private Pilot Rotorcraft document.
- VIII identifies Emergency Operations, the Area of Operation.
- I identifies Ground Resonance, 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 |
|---|---|---|
| PH.VIII.I.K1 | Exhibits knowledge of the elements related to ground resonance by describing: | Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant. |
| PH.VIII.I.K1a | a. Conditions that contribute to ground resonance | Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant. |
| PH.VIII.I.K1b | b. Preventive flight technique during takeoffs and landings | Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant. |
| PH.VIII.I.K1c | c. Landing surface | Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant. |
| PH.VIII.I.K2 | Inspection of items that may contribute to ground resonance. | Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant. |
| PH.VIII.I.K3 | Corrective actions during low and normal rotor rpm speeds. | 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 |
|---|---|---|
| PH.VIII.I.R1 | Factors that may contribute to the onset of ground resonance. | Work through a scenario by identifying the hazard, evaluating the risk, and explaining a practical mitigation or decision. |
| PH.VIII.I.R2 | Recognition of the onset of ground resonance. | Work through a scenario by identifying the hazard, evaluating the risk, and explaining a practical mitigation or decision. |
| PH.VIII.I.R3 | Recovery procedure selection. | 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 |
|---|---|---|
| PH.VIII.I.S1 | [Intentionally left blank]. | 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: Evaluator assesses this Task orally only.
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 Private Pilot Rotorcraft ACS tasks
49 task-level resources from FAA-S-ACS-15.
- PH.VIII.H — Dynamic Rollover
Area of Operation VIII. Emergency Operations
- PH.VIII.J — Low Gravity (G) Recognition and Recovery
Area of Operation VIII. Emergency Operations
- PH.VIII.A — Powerplant Failure in a Hover in a Single-Engine Helicopter
Area of Operation VIII. Emergency Operations
- PH.VIII.B — Powerplant Failure at Altitude in a Single-Engine Helicopter
Area of Operation VIII. Emergency Operations
- PH.VIII.C — Approach and Landing with One Engine Inoperative (OEI) (Simulated) (Multiengine Helicopter Only)
Area of Operation VIII. Emergency Operations
- PH.VIII.D — Systems and Equipment Malfunctions
Area of Operation VIII. Emergency Operations