AIM Chapter 4 — Air Traffic Control

What is the primary purpose of an Air Route Traffic Control Center (ARTCC)?

What is the single most important concept in pilot-controller radio communications?

What four elements should be included in an initial radio callup to an ATC facility?

Why is it important to always acknowledge a frequency change instruction from ATC?

When may ATC abbreviate an aircraft's call sign?

How should a student pilot identify themselves on initial radio contact with an ATC facility?

What is ATIS, and what is its primary purpose?

What does it mean if the ceiling/sky condition and visibility are absent from an ATIS broadcast?

What does using the phrase 'have numbers' mean when contacting a control tower?

What is a CTAF and when is it used?

When should inbound pilots at a non-towered airport begin monitoring and communicating on the CTAF?

What MULTICOM frequency should be used for self-announce procedures at an airport with no tower, FSS, or UNICOM?

What is UNICOM?

What is the phrase 'Traffic in the area, please advise' and is it a recognized self-announce procedure?

At what altitude should propeller-driven aircraft enter the airport traffic pattern?

What is the standard direction for turns in the traffic pattern, and how are right-pattern airports identified on charts?

What are the six standard components of a traffic pattern?

How far from the airport should you make initial radio contact when operating at a towered airport?

What does a steady green light gun signal mean to an aircraft on the ground? And to an aircraft in flight?

What does a flashing red light gun signal mean to an aircraft on the ground? And to an aircraft in flight?

What does an alternating red and green light gun signal mean?

How does a pilot acknowledge light gun signals during daylight hours when the transmitter is inoperative?

If your receiver is inoperative approaching a towered airport, what should you do?

What is an ATC clearance, and what does it NOT authorize?

What should a pilot do if ATC issues a clearance that would cause a deviation from regulations or place the aircraft in jeopardy?

What transponder code do VFR aircraft squawk when not assigned a specific code by ATC?

What are the three special transponder codes and what do they each indicate?

Why should you avoid inadvertently selecting codes 7500, 7600, or 7700 when making routine transponder code changes?

When must Mode C transponder and ADS-B Out be operated in controlled airspace?

What does the ATC instruction 'SQUAWK IDENT' mean, and when should a pilot activate IDENT?

What is ADS-B Out, and on which two frequencies does it operate in the U.S.?

Can an ADS-B In cockpit display be used for avoidance maneuvers or as a collision avoidance system?

What is 'Radar Contact' as used by ATC?

What does ground control frequency primarily serve, and what is its typical MHz range?

What readback items are always required when receiving taxi instructions from ATC?