Airman Certification Standards
ACS AA.I.A
Operation of Systems
Knowledge
Landing gear–extension/retraction system(s), indicators, float devices, brakes, antiskid, tires, nose- wheel steering, and shock absorbers.
AA = Applicable ACS 60 Appendix 1: Practical Test Roles, Responsibilities, and OutcomesAirline Transport Pilot and Type Rating for Airplane Category ACS (FAA-S-ACS-11A) I = Area of Operation A = Task K2 = Task element (in this example, Knowledge 2) There is no requirement for an evaluator to test every knowledge and risk management element in a Task; rather the evaluator has discretion to sample as needed to ensure the applicant’s mastery of that Task. The required minimum elements to be tested from each applicable Task include: • any elements in which the applicant was shown to be deficient on the knowledge test, as applicable; • at least one knowledge element; • at least one risk management element; and • all skill elements unless otherwise noted. The Airman Knowledge Test Report (AKTR) lists ACS codes that correlate to a specific Task element for a given Area of Operation for any incorrect responses on the knowledge test. Knowledge and risk management elements are primarily evaluated during the knowledge testing phase of the airman certification process. The evaluator administering the practical test has the discretion to combine Tasks/elements as appropriate to testing scenarios. Unless otherwise noted in the Task, the evaluator must test each item in the skills section by observing the applicant perform each one. As safety of flight conditions permit, the evaluator should use questions during flight to test knowledge and risk management elements not evident in the demonstrated skills. To the greatest extent practicable, evaluators should test the applicant’s ability to apply and correlate information and use rote questions only when they are appropriate for the material being tested. If the Task includes a knowledge or risk element with sub-elements, the evaluator may choose the primary element and select at least one sub-element to satisfy the requirement. Selection of the sub-element satisfies the requirement for one element unless otherwise noted. For example, an evaluator who chooses
Propellers–type, controls, feathering/unfeathering, auto-feather, negative torque sensing, synchronizing, synchrophasing, and thrust reverse, including uncommanded reverse procedures.
Fuel system–capacity, drains, pumps, controls, indicators, cross-feeding, transferring, jettisoning, fuel grade, color and additives, fueling and defueling procedures, and fuel substitutions.
Oil system–capacity, allowable types of oil, quantities, and indicators.
Hydraulic system–capacity, pumps, pressure, reservoirs, allowable types of fluid, and regulators.
Electrical system–alternators, generators, batteries, circuit breakers and protection devices, controls, indicators, and external and auxiliary power sources and ratings.
Pneumatic and environmental systems–heating, cooling, ventilation, oxygen, pressurization, supply for ice protection systems, controls, indicators, and regulating devices.
Avionics and communications–autopilot, flight director, Electronic Flight Instrument Systems (EFIS), Flight Management System (FMS), Electronic Flight Bag (EFB), Radar, Inertial Navigation Systems (INS), Global Navigation Satellite System (GNSS), Space-Based Augmentation System (SBAS), Ground-Based Augmentation System (GBAS), ground-based navigation systems and components, Automatic Dependent Surveillance – Broadcast (ADS-B) In and Out, Automatic Dependent Surveillance – Contract (ADS-C), traffic awareness/warning/avoidance systems, terrain awareness/ warning/alert systems, communication systems (e.g., data link, Ultra High Frequency (UHF)/Very High Frequency (VHF)/High Frequency (HF), satellite), Controller Pilot Data Link Communication (CPDLC), indicating devices, transponder, and emergency locator transmitter, Head Up-Display (HUD).
Ice protection–anti-ice, deice, pitot-static system protection, turbine inlet, propeller, windshield, airfoil surfaces, and other related components.
Crewmember and passenger equipment–oxygen system, survival gear, emergency exits, evacuation procedures and crew duties, quick donning oxygen mask for crewmembers, passenger oxygen system.
Flight controls–ailerons, elevator(s), rudder(s), control tabs, control boost/augmentation systems, flaps, spoilers, leading edge devices, speed brakes, stability augmentation system (e.g., yaw damper), and trim systems.
Pitot-static system–associated instruments and the power source for those flight instruments. Operation and power sources for other flight instruments. 3
Fire & smoke detection, protection, and suppression–powerplant, cargo and passenger compartments, lavatory, pneumatic and environmental, electrical/avionics, and batteries (on aircraft and personal electronic devices).
Envelope protection–angle of attack warning and protection, and speed protection.
The contents of the Pilot Owner's Handbook (POH) or Airplane Flight Manual (AFM) with regard to the systems and components in the airplane.
How to use a Minimum Equipment List (MEL) and a Configuration Deviation List (CDL).
Risk Management
Detection of system malfunctions or failures.
Management of a system failure.
Monitoring and management of automated systems.
Following checklists or procedures.
Skill
Explain and describe the operation of the aircraft systems and components using correct terminology.
Recall immediate action items or memory items, if appropriate.
Identify system or component limitations listed in the POH/AFM.
Demonstrate or describe, as appropriate, the process for deferring inoperative equipment (e.g., MEL) and using a CDL.
Comply with operations specifications, management specifications, and letters of authorization, if applicable.
Through the use of the appropriate checklists and normal and abnormal procedures, demonstrate the proper use of the aircraft systems, subsystems, and devices, as determined by the evaluator.
Retrieved from ecfr.gov on July 17, 2026.