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AA.I.D — High-Altitude Aerodynamics (ATP) (AMEL, AMES)

AA.I.D for the Airline Transport Pilot Airplane ACS: official objective, references, and 14 exact knowledge, risk-management, and skill descriptions.

FAA-S-ACS-11A, November 2023. This study page does not replace the current FAA publication or an examiner's plan of action.

Official task context

AA.I.D official ACS context
Certificate or ratingAirline Transport Pilot
Aircraft categoryAirplane
Area of operationArea of Operation I. Preflight Preparation
TaskTask D. High-Altitude Aerodynamics (ATP) (AMEL, AMES)
Task code prefixAA.I.D
Official referencesAC 61-107, AC 61-138, AC 120-111; FAA-H-8083-2, FAA-H-8083-3, FAA-H-8083-25
FAA documentFAA-S-ACS-11A — Airline Transport Pilot and Type Rating for Airplane 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 high altitude airplane aerodynamics.

What the ACS code means

  • AA identifies the ACS standard family used for this Airline Transport Pilot Airplane document.
  • I identifies Preflight Preparation, the Area of Operation.
  • D identifies High-Altitude Aerodynamics (ATP) (AMEL, AMES), 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
AA.I.D.K1Aerodynamics of large transport category airplanes, including flight characteristics of swept wing airplanes (e.g., Mach buffet).Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant.
AA.I.D.K2Energy management.Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant.
AA.I.D.K3Relationship between Mach number, indicated airspeed, true airspeed, and change over altitudes.Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant.
AA.I.D.K4Load factor at high altitude and its effect on high and low speed operating margins.Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant.
AA.I.D.K5Relationship between altitude capability, weight, and temperature.Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant.
AA.I.D.K6Maximum Operating Speed - Knots (VMO) / Maximum Operating Speed - Mach (MMO) convergence and stall angle of attack.Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant.
AA.I.D.K7Maximum Lift over Drag Ratio (L/DMAX).Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant.
AA.I.D.K8Best range and best endurance.Explain the element, apply it to a scenario, and connect the answer to current references or aircraft information when relevant.
AA.I.D.K9Factors which contribute to airplane upsets at high altitude and upset prevention and recovery techniques.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
AA.I.D.R1Managing the airplane’s energy state.Work through a scenario by identifying the hazard, evaluating the risk, and explaining a practical mitigation or decision.
AA.I.D.R2High operating altitudes at high operational weights.Work through a scenario by identifying the hazard, evaluating the risk, and explaining a practical mitigation or decision.
AA.I.D.R3High altitude slow-downs and excursions behind the power curve.Work through a scenario by identifying the hazard, evaluating the risk, and explaining a practical mitigation or decision.
AA.I.D.R4Turbulence at high altitude.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
AA.I.D.S1If a cruise altitude is reached, manage the airplane’s systems and energy state.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 1: Practical Test Roles, Responsibilities, and Outcomes 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

Related ACS tasks