HI.XI.M — Antitorque System Failure
HI.XI.M for the Flight Instructor Rotorcraft ACS: official objective, references, and 10 exact knowledge, risk-management, and skill descriptions.
FAA-S-ACS-29, 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 | Flight Instructor |
|---|---|
| Aircraft category | Rotorcraft |
| Area of operation | Area of Operation XI. Emergency Operations |
| Task | Task M. Antitorque System Failure |
| Task code prefix | HI.XI.M |
| Official references | FAA-H-8083-2, FAA-H-8083-4, FAA-H-8083-9, FAA-H-8083-21, FAA-H-8083-25; POH/RFM |
| FAA document | FAA-S-ACS-29 — Flight Instructor for Rotorcraft Category Helicopter Rating Airman Certification Standards |
| FAA source library | Open the official ACS library |
Official task objective
To determine the applicant understands antitorque system failure, can apply that knowledge, manage associated risks, demonstrate appropriate skills, and provide effective instruction.
What the ACS code means
- HI identifies the ACS standard family used for this Flight Instructor Rotorcraft document.
- XI identifies Emergency Operations, the Area of Operation.
- M identifies Antitorque System Failure, 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 |
|---|---|---|
| HI.XI.M.K1 | Elements related to antitorque system failure by describing: | Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant. |
| HI.XI.M.K1a | a. Indications of an antitorque system failure(s) | Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant. |
| HI.XI.M.K1b | b. Differences between complete loss of antitorque and mechanical flight control failures | Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant. |
| HI.XI.M.K1c | c. RFM procedures for antitorque system(s) failure | Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant. |
| HI.XI.M.K2 | Wind conditions that favor a landing with an antitorque failure. | Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant. |
| HI.XI.M.K3 | Common 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
| ACS code | Official description | How a mock oral can probe it |
|---|---|---|
| HI.XI.M.R1 | Preflight inspection of the antitorque system. | Work through a scenario by identifying the hazard, evaluating the risk, and explaining a practical mitigation or decision. |
| HI.XI.M.R2 | Antitorque failure(s) for the aircraft supplied for the practical test. | Work through a scenario by identifying the hazard, evaluating the risk, and explaining a practical mitigation or decision. |
| HI.XI.M.R3 | Use of antitorque failure procedures. | 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 |
|---|---|---|
| HI.XI.M.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
- 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 Flight Instructor Rotorcraft ACS tasks
65 task-level resources from FAA-S-ACS-29.
- HI.XI.L — Emergency Equipment and Survival Gear
Area of Operation XI. Emergency Operations
- HI.XII.A — Confined Area Operations
Area of Operation XII. Special Operations
- HI.XI.A — Powerplant Failure in a Hover in a Single-Engine Helicopter
Area of Operation XI. Emergency Operations
- HI.XI.B — Powerplant Failure at Altitude in a Single-Engine Helicopter
Area of Operation XI. Emergency Operations
- HI.XI.C — Approach and Landing with One Engine Inoperative (OEI) (Simulated) (Multiengine Helicopter Only)
Area of Operation XI. Emergency Operations
- HI.XI.D — Flight Solely by Reference to Instruments
Area of Operation XI. Emergency Operations