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FAA ACS Code

AA.I.A.K3

A

Certificate: Airline Transport Pilot – AirplaneType: Knowledge

What does AA.I.A.K3 mean?

Propellers - type, controls, feathering/unfeathering, auto-feather, negative torque sensing, synchronizing, synchrophasing, and thrust reverse including uncommanded reverse procedures..

Area of Operation
I
Task
A
Element type
A Knowledge element — a fact, concept, or procedure the FAA expects you to know and that the knowledge (written) test draws questions from.

What you need to know

This task is really about knowing your specific airplane's systems cold—not generic aircraft knowledge. For every system (gear, powerplant, props, fuel, oil, hydraulics, electrical, pneumatic/environmental, avionics, ice protection, flight controls, and emergency equipment), you need to understand how it works, what powers or drives it, how it's controlled, what the indicators tell you, and what happens when it fails or a backup takes over. The examiner is testing whether you can explain the logic behind each system (why cross-feed exists, how autofeather protects you on an engine failure, what triggers antiskid, how bleed air ties into pressurization and ice protection) rather than just naming parts. Study your AFM/POH systems chapters for the actual airplane you're testing in, since exact capacities, pressures, and limitations are aircraft-specific and must come from that source, not a general reference.

Why students miss this

Because this task spans nearly every airplane system, students often study the systems generically instead of tying each one to how it actually behaves and fails on their specific aircraft type. The trap is answering from general aerodynamic or systems knowledge rather than knowing the particular logic of your airplane's gear, fuel, hydraulic, or ice protection design — examiners expect type-specific depth, not textbook generalities.

Focus on: Work through your aircraft's systems using the actual flight manual or POH/AFM, tracing each system's normal operation, indications, and failure modes rather than relying on general knowledge.

Missed this on your test?

Drill this area until it sticks

AA.I.A.K3 came from a question you missed on the FAA Airline Transport Pilot Multiengine Airplane knowledge test. Drill ACS-aligned practice questions with AI explanations and the cited FAA handbook reference behind every answer — free to start.

Missing it isn't a verdict on you — it's a sign your prep skipped the why behind it. Memorizing answer letters is exactly what leaves gaps like this. Here, every answer explains the reasoning and cites the FAA source it comes from, so the concept holds on test day and at the checkride oral.

Try a free practice test →Airline Transport Pilot Multiengine Airplane prep

Study this concept

Plain-English explanations of the key ideas behind AA.I.A.K3, grounded in the FAA handbooks.

Related ACS codes in A

Other elements the FAA tests under this same Task — review them together.

+ 6 more elements in this Task.

Common question

Do I need to memorize every number and limitation for every system on my aircraft?

You need working knowledge of how each system operates, fails, and is indicated in the cockpit, and you should know where to find precise limitations in your aircraft's official flight manual rather than memorizing every figure.

What is an FAA ACS code?

The FAA's Airman Certification Standards (ACS) break each certificate into Areas of Operation, Tasks, and specific Knowledge (K), Risk Management (R), and Skill (S) elements. Every knowledge-test question maps to one code like AA.I.A.K3. When you miss a question, your Airman Knowledge Test Report lists its code so you know exactly what to review.

Have a whole list of codes from your report? Paste them all into our free ACS code lookup to see every weak area at once — or browse the aviation glossary for plain-English definitions.

All ACS documents at faa.gov ↗