IL.II.M — High Altitude Operations - Supplemental Oxygen
IL.II.M for the Flight Instructor Powered Lift ACS: official objective, references, and 16 exact knowledge, risk-management, and skill descriptions.
FAA-S-ACS-27, 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 | Powered Lift |
| Area of operation | Area of Operation II. Technical Subject Areas |
| Task | Task M. High Altitude Operations - Supplemental Oxygen |
| Task code prefix | IL.II.M |
| Official references | 14 CFR part 91; AC 61-107; AIM; FAA-H-8083-2, FAA-H-8083-9, FAA-H-8083-25; Flight Manual |
| FAA document | FAA-S-ACS-27 — Flight Instructor for Powered-Lift Category 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 flight at higher altitudes where supplemental oxygen is required or recommended, can apply that knowledge, manage associated risks, demonstrate appropriate skills, and provide effective instruction.
What the ACS code means
- IL identifies the ACS standard family used for this Flight Instructor Powered Lift document.
- II identifies Technical Subject Areas, the Area of Operation.
- M identifies High Altitude Operations - Supplemental Oxygen, 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 |
|---|---|---|
| IL.II.M.K1 | Regulatory requirements for supplemental oxygen use by flight crew and passengers. | Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant. |
| IL.II.M.K2 | Physiological factors, including: | Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant. |
| IL.II.M.K2a | a. Impairment | Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant. |
| IL.II.M.K2b | b. Symptoms of hypoxia | Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant. |
| IL.II.M.K2c | c. Time of useful consciousness (TUC) | Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant. |
| IL.II.M.K3 | Operational factors, including: | Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant. |
| IL.II.M.K3a | a. Characteristics, limitations, and applicability of continuous flow, demand, and pressuredemand oxygen systems | Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant. |
| IL.II.M.K3b | b. Differences between and identification of “aviator’s breathing oxygen” and other types of oxygen | Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant. |
| IL.II.M.K3c | c. Precautions when using supplemental oxygen systems | 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 |
|---|---|---|
| IL.II.M.R1 | High altitude flight. | Work through a scenario by identifying the hazard, evaluating the risk, and explaining a practical mitigation or decision. |
| IL.II.M.R2 | Use of supplemental oxygen. | Work through a scenario by identifying the hazard, evaluating the risk, and explaining a practical mitigation or decision. |
| IL.II.M.R3 | Management of compressed gas containers. | Work through a scenario by identifying the hazard, evaluating the risk, and explaining a practical mitigation or decision. |
| IL.II.M.R4 | Combustion hazards in an oxygen-rich environment. | 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 |
|---|---|---|
| IL.II.M.S1 | Provide an adequate briefing on use of supplemental oxygen equipment. | Describe the procedure, interpretation, or decision process that can be discussed during an oral. Physical aircraft performance remains part of the practical test. |
| IL.II.M.S2 | Operate or simulate operation of the installed or portable oxygen equipment in the aircraft, if installed or available. | Describe the procedure, interpretation, or decision process that can be discussed during an oral. Physical aircraft performance remains part of the practical test. |
| IL.II.M.S3 | Determine the quantity of supplemental oxygen required in a scenario given by the evaluator. | 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 Flight Instructor Powered Lift ACS tasks
73 task-level resources from FAA-S-ACS-27.
- IL.II.L — Night Operations
Area of Operation II. Technical Subject Areas
- IL.II.N — High Altitude Operations - Pressurization
Area of Operation II. Technical Subject Areas
- IL.II.A — Human Factors
Area of Operation II. Technical Subject Areas
- IL.II.B — Visual Scanning and Collision Avoidance
Area of Operation II. Technical Subject Areas
- IL.II.C — Runway Incursion Avoidance
Area of Operation II. Technical Subject Areas
- IL.II.D — Principles of Flight
Area of Operation II. Technical Subject Areas