Air Traffic Control Procedures and Communications
What you must know
Learn standard phraseology, ATC clearances, and the readback requirement. Understand airspace classes and their communication and equipment requirements. Know the difference between a clearance, an instruction, and an advisory. Learn the phonetic alphabet, standard traffic pattern calls, and the meaning of "roger," "wilco," "affirm," and "unable."
Traps
A clearance is not an instruction to deviate from a regulation; you must still comply with the FARs. Readback is required for runway assignments, hold short instructions, and altitude assignments. "Unable" is a valid and expected response when a clearance cannot be safely complied with. Do not confuse "standby" with "hold short." Class B requires an explicit clearance; Class C and D require two-way radio contact. Transponder requirements vary by airspace.
Rule of thumb
If you cannot comply with an ATC instruction, say "unable" and state the reason. Never say "roger" when you mean "wilco." Always read back hold short instructions verbatim.
Worked example
ATC: "Cessna 12345, hold short of runway 27." Correct readback: "Hold short of runway 27, Cessna 12345." Do not cross the hold short line until explicitly cleared. If you cannot hold short, respond "unable" immediately.