Below are the ACS codes (formerly known as PLT codes) that you will find on your FAA written test results. If you missed any questions on your FAA written exam (which 99.9% of pilots do) you will have a few of these codes listed on your computer test report. While there is no way to know for certain exactly which questions you got wrong on the written exam, the ACS question codes listed below correlate directly to subject areas of the questions missed on the written. You can click on the subject area link to get more information about that specific subject area located in one of our YouTube videos, blog posts, or course lessons. (Tip: you want to be logged in to the site when clicking on the links so that the course material will load when you click the link rather than the course homepage). ACS Code Knowledge CA.I.A.K1 Certification requirements, recent flight experience, and recordkeeping. CA.I.A.K2 Privileges and limitations. CA.I.A.K3 Medical certificates: class, expiration, privileges, temporary disqualifications. CA.I.A.K4 Documents required to exercise commercial pilot privileges. CA.I.A.K5 Part 68 BasicMed privileges and limitations. CA.I.B.K1 General airworthiness requirements and compliance for airplanes, including: CA.I.B.K1a a. Certificate location and expiration dates CA.I.B.K1b b. Required inspections and airplane logbook documentation CA.I.B.K1c c. Airworthiness Directives and Special Airworthiness Information Bulletins CA.I.B.K1d d. Purpose and procedure for obtaining a special flight permit CA.I.B.K2 Pilot-performed preventive maintenance. CA.I.B.K3 Equipment requirements for day and night VFR flight, to include: CA.I.B.K3a a. Flying with inoperative equipment CA.I.B.K3b b. Using an approved Minimum Equipment List (MEL) CA.I.B.K3c c. Kinds of Operation Equipment List (KOEL) CA.I.B.K3d d. Required discrepancy records or placards CA.I.C.K1 Sources of weather data (e.g., National Weather Service, Flight Service) for flight planning purposes. CA.I.C.K2 Acceptable weather products and resources required for preflight planning, current and forecast weather for departure, en route, and arrival phases of flight. CA.I.C.K3 Meteorology applicable to the departure, en route, alternate, and destination under VFR in Visual Meteorological Conditions (VMC) to include expected climate and hazardous conditions such as: CA.I.C.K3a a. Atmospheric composition and stability CA.I.C.K3b b. Wind (e.g., crosswind, tailwind, wind shear, mountain wave, etc.) CA.I.C.K3c c. Temperature CA.I.C.K3d d. Moisture/precipitation CA.I.C.K3e e. Weather system formation, including air masses and fronts CA.I.C.K3f f. Clouds CA.I.C.K3g g. Turbulence CA.I.C.K3h h. Thunderstorms and microbursts CA.I.C.K3i i. Icing and freezing level information CA.I.C.K3j j. Fog/mist CA.I.C.K3k k. Frost CA.I.C.K3l l. Obstructions to visibility (e.g., smoke, haze, volcanic ash, etc.) CA.I.C.K4 Flight deck displays of digital weather and aeronautical information. CA.I.D.K1 Route planning, including consideration of different classes and special use airspace (SUA) and selection of appropriate and available navigation/communication systems and facilities. CA.I.D.K2 Altitude selection accounting for terrain and obstacles, glide distance of the airplane, VFR cruising altitudes, and the effect of wind. CA.I.D.K3 Calculating: CA.I.D.K3a a. Time, climb and descent rates, course, distance, heading, true airspeed, and groundspeed CA.I.D.K3b b. Estimated time of arrival to include conversion to universal coordinated time (UTC) CA.I.D.K3c c. Fuel requirements, to include reserve CA.I.D.K4 Elements of a VFR flight plan. CA.I.D.K5 Procedures for activating and closing a VFR flight plan. CA.I.E.K1 Types of airspace/airspace classes and associated requirements and limitations. CA.I.E.K2 Charting symbology. CA.I.E.K3 Special use airspace (SUA), special flight rules areas (SFRA), temporary flight restrictions (TFR), and other airspace areas. CA.I.F.K1 Elements related to performance and limitations by explaining the use of charts, tables, and data to determine performance. CA.I.F.K2 Factors affecting performance, to include: CA.I.F.K2a a. Atmospheric conditions CA.I.F.K2b b. Pilot technique CA.I.F.K2c c. Airplane configuration CA.I.F.K2d d. Airport environment CA.I.F.K2e e. Loading (e.g., center of gravity) CA.I.F.K2f f. Weight and balance CA.I.F.K3 Aerodynamics. CA.I.G.K1 Airplane systems, to include: Note: If K1 is selected, the evaluator must assess the applicant’s knowledge of at least three of the following sub-elements. CA.I.G.K1a a. Primary flight controls CA.I.G.K1b b. Secondary flight controls CA.I.G.K1c c. Powerplant and propeller CA.I.G.K1d d. Landing gear CA.I.G.K1e e. Fuel, oil, and hydraulic CA.I.G.K1f f. Electrical CA.I.G.K1g g. Avionics CA.I.G.K1h h. Pitot-static, vacuum/pressure, and associated flight instruments CA.I.G.K1i i. Environmental CA.I.G.K1j j. Deicing and anti-icing CA.I.G.K1k k. Water rudders (ASES, AMES) CA.I.G.K1l l. Oxygen system CA.I.G.K2 Indications of and procedures for managing system abnormalities or failures. CA.I.H.K1 The symptoms (as applicable), recognition, causes, effects, and corrective actions associated with aeromedical and physiological issues including: CA.I.H.K1a a. Hypoxia CA.I.H.K1b b. Hyperventilation CA.I.H.K1c c. Middle ear and sinus problems CA.I.H.K1d d. Spatial disorientation CA.I.H.K1e e. Motion sickness CA.I.H.K1f f. Carbon monoxide poisoning CA.I.H.K1g g. Stress CA.I.H.K1h h. Fatigue CA.I.H.K1i i. Dehydration and nutrition CA.I.H.K1j j. Hypothermia CA.I.H.K1k k. Optical illusions CA.I.H.K1l l. Dissolved nitrogen in the bloodstream after scuba dives CA.I.H.K2 Regulations regarding use of alcohol and drugs. CA.I.H.K3 Effects of alcohol, drugs, and over-the-counter medications. CA.I.H.K4 Aeronautical Decision-Making (ADM). CA.I.I.K1 The characteristics of a water surface as affected by features, such as: CA.I.I.K1a a. Size and location CA.I.I.K1b b. Protected and unprotected areas CA.I.I.K1c c. Surface wind CA.I.I.K1d d. Direction and strength of water current CA.I.I.K1e e. Floating and partially submerged debris CA.I.I.K1f f. Sandbars, islands, and shoals CA.I.I.K1g g. Vessel traffic and wakes CA.I.I.K1h h. Other characteristics specific to the area CA.I.I.K2 Float and hull construction, and its effect on seaplane performance. CA.I.I.K3 Causes of porpoising and skipping, and the pilot action needed to prevent or correct these occurrences. CA.I.I.K4 How to locate and identify seaplane bases on charts or in directories. CA.I.I.K5 Operating restrictions at various bases. CA.I.I.K6 Right-of-way, steering, and sailing rules pertinent to seaplane operation. CA.I.I.K7 Marine navigation aids, such as buoys, beacons, lights, sound signals, and range markers. CA.II.A.K1 Pilot self-assessment. CA.II.A.K2 Determining that the airplane to be used is appropriate and airworthy. CA.II.A.K3 Airplane preflight inspection including: CA.II.A.K3a a. Which items must be inspected CA.II.A.K3b b. The reasons for checking each item CA.II.A.K3c c. How to detect possible defects CA.II.A.K3d d. The associated regulations CA.II.A.K4 Environmental factors including weather, terrain, route selection, and obstructions. CA.II.B.K1 Passenger briefing requirements, to include operation and required use of safety restraint systems. CA.II.B.K2 Use of appropriate checklists. CA.II.B.K3 Requirements for current and