Radio Communications — Speaking the Language of Aviation
The radio is your primary tool for sharing the sky with other aircraft and working with air traffic control. Good radio technique builds confidence, improves safety, and marks you as a competent pilot. This module teaches you everything from the phonetic alphabet through emergency declarations — with real-world scripts you can practice before your first flight. See our full radio communications guide →
- Recite the phonetic alphabet for all 26 letters without hesitation
- Apply the four-element radio call formula to any situation
- Demonstrate correct CTAF self-announcement scripts for non-towered airports
- Execute the full radio sequence for a towered airport from ground to landing
- Request and receive VFR flight following from an approach control facility
- Declare a MAYDAY emergency using correct phraseology
- Identify all four special transponder codes and when each applies
Lesson 1 — The Phonetic Alphabet and Number Pronunciation
The ICAO phonetic alphabet replaces letters with internationally standardized words — eliminating confusion between similar-sounding letters over radio (B/D/E/G/P/T/V all sound similar in poor radio conditions). Every pilot must know all 26 without hesitation. You use them constantly: aircraft identifiers, taxiway designations, ATIS information codes, clearances, and more.
Number pronunciation
Aviation numbers are spoken digit-by-digit, not as compound numbers. The word "niner" is used for 9 to avoid confusion with the German "nein" (no). Several numbers have specific pronunciation rules:
- Runway 27 = "two-seven" (not "twenty-seven")
- Altitude 3,500 = "three thousand five hundred"
- Frequency 122.8 = "one two two point eight"
- Heading 090 = "zero niner zero" (always 3 digits)
- The number 9 = "niner"
- Time 1753Z = "one seven five three Zulu" (always UTC/Zulu)
The four-element radio formula — use it every time:
(1) Who you are calling · (2) Who you are · (3) Where you are · (4) What you want
Example: "Springfield Ground, Cessna November One Two Three Four Five, at the ramp with information Bravo, request taxi for departure."
Every radio call you make should contain all four elements — in that order. After initial contact, controllers abbreviate your call sign to the last three characters. Once they do, you can too.
Lesson 2 — ATIS and Obtaining Weather Before Calling
At towered airports, always listen to ATIS (Automatic Terminal Information Service) before making any radio calls to the tower or ground. ATIS is a pre-recorded broadcast of current airport weather and NOTAMs, updated whenever conditions change significantly and re-lettered each time (Alpha, Bravo, Charlie, and so on through Zulu, then back to Alpha).
When you call ground or approach, you include "with information [letter]" in your call — this tells the controller you have the current ATIS and they don't need to read you all the weather. Not having ATIS wastes controller time and marks you as unprepared.
Lesson 3 — Non-Towered Airport Operations (CTAF)
At non-towered airports, there is no ATC to sequence traffic — pilots self-announce on the CTAF (Common Traffic Advisory Frequency) to broadcast their position and intentions to other pilots. No one responds to your calls — you are broadcasting, not communicating. Other pilots do the same, and together you build a picture of who is in the pattern.
The CTAF frequency is found in the Chart Supplement (formerly A/FD) and shown on sectional charts with a small "C" in a circle next to the airport. At some airports, CTAF doubles as UNICOM (the frequency for requesting fuel, weather information, or other services from the FBO).
"Millville Traffic, Cessna November One Two Three Four Five, ten miles south, two thousand five hundred, inbound landing runway two-seven, Millville."
Entering the pattern:
"Millville Traffic, Cessna Three Four Five, entering left downwind runway two-seven, Millville."
Turning base:
"Millville Traffic, Cessna Three Four Five, left base runway two-seven, Millville."
Turning final:
"Millville Traffic, Cessna Three Four Five, final runway two-seven, Millville."
After landing — clearing the runway:
"Millville Traffic, Cessna Three Four Five, clear of runway two-seven, Millville."
Why you say the airport name twice: CTAF calls always begin and end with the airport name. This is because pilots at different airports may share the same frequency — hearing the airport name at the end confirms this call was for your airport, not another airport sharing the frequency.
Lesson 4 — Towered Airport Radio Sequence
At airports with an operating control tower, you must establish radio contact and receive instructions from ATC before entering the movement area (taxiways and runway) and before taking off or landing. The sequence follows a logical flow through three ATC facilities: ground control (for surface movement), tower (for runway operations), and approach/departure control (for IFR or VFR flight following).
2. Call Ground Control for taxi:
YOU: "Springfield Ground, Cessna November One Two Three Four Five, at the terminal ramp, VFR to Kansas City, with information Bravo, request taxi."
ATC: "Cessna Three Four Five, taxi to runway two-seven via taxiway Alpha, hold short of runway one-eight."
YOU: "Taxi runway two-seven via Alpha, hold short one-eight, Cessna Three Four Five."
3. At hold-short line, call Tower:
YOU: "Springfield Tower, Cessna Three Four Five, holding short runway two-seven, ready for departure."
ATC: "Cessna Three Four Five, runway two-seven, cleared for takeoff, wind two-seven-zero at one-two."
YOU: "Cleared for takeoff runway two-seven, Cessna Three Four Five."
4. After takeoff, Tower may hand you off:
ATC: "Cessna Three Four Five, contact Kansas City Departure one one niner point one, good day."
YOU: "One one niner point one, Cessna Three Four Five, good day."
Mandatory readbacks
Certain ATC instructions must always be read back — not just acknowledged with "roger." These are:
- Runway assignments (for takeoff or landing)
- Hold-short instructions ("hold short of runway two-seven")
- Cleared for takeoff / cleared to land
- Altimeter settings
- Heading, altitude, or speed assignments in Class B, C, or D airspace
- Any safety-critical instruction
Reading back confirms you received the correct instruction. "Roger" alone does not confirm the specific content — only that you heard something. A runway incursion where the pilot read back a wrong runway is far more catchable than one where the pilot just said "roger."
ATC: "Cessna Three Four Five, Springfield Approach, radar contact, expect the visual approach runway two-seven, report four-mile final."
YOU: "Report four-mile final runway two-seven, Cessna Three Four Five."
[on final...]
YOU: "Springfield Approach, Cessna Three Four Five, four-mile final runway two-seven."
ATC: "Cessna Three Four Five, contact tower one two one point three."
YOU: "One two one point three, Cessna Three Four Five."
YOU: "Springfield Tower, Cessna Three Four Five, four-mile final runway two-seven."
ATC: "Cessna Three Four Five, runway two-seven, cleared to land, wind two-eight-zero at eight."
YOU: "Cleared to land runway two-seven, Cessna Three Four Five."
Lesson 5 — VFR Flight Following
VFR flight following is a free, optional radar traffic advisory service provided by ATC to VFR pilots. It does not change VFR rules, minimums, or pilot-in-command authority — but it provides traffic call-outs, weather advisories, routing assistance, and a safety net for the entire flight. Highly recommended for any cross-country flight.
ATC: "Cessna One Two Three Four Five, go ahead."
YOU: "Cessna November One Two Three Four Five, Cessna one-seven-two, departing Olathe to Springfield, VFR at six thousand five hundred, request flight following."
ATC: "Cessna Three Four Five, squawk four five two one, ident."
YOU: "Squawking four five two one, ident, Cessna Three Four Five."
ATC: "Cessna Three Four Five, radar contact three miles east of Olathe, altimeter two niner eight two. Traffic twelve o'clock, five miles, eastbound, altitude unknown."
YOU: "Traffic in sight, Cessna Three Four Five." (or "Negative contact, Cessna Three Four Five.")
During flight following: respond promptly to traffic calls, report position changes if ATC asks, and advise when you want to cancel (if you don't want the service anymore) or when landing. At the destination: "Cessna Three Four Five, canceling VFR flight following, landing Springfield."
Lesson 6 — Emergency Radio Procedures
An aviation emergency is any situation that threatens safety of flight and demands immediate attention. FAA regulations and aviation culture strongly encourage pilots to declare emergencies early and clearly — the consequences of an unnecessary declaration are minimal (paperwork, possibly an explanation), while the consequences of not declaring can be fatal.
MAYDAY — the distress call
![MAYDAY emergency call format card: MAYDAY MAYDAY MAYDAY — [Facility or Any Station] — [Aircraft ID] — [Nature of Emergency] — [Position] — [Altitude] — [Intentions] — [Souls on Board]. Set transponder 7700, transmit on 121.5 MHz.](../images/m09-mayday-format.png)
MAYDAY is the international distress signal for a life-threatening emergency requiring immediate assistance. It is transmitted three times followed by all relevant information. Say it clearly, without hesitation. Every controller who hears MAYDAY immediately clears the frequency and provides maximum assistance.
If you cannot reach ATC on your assigned frequency: switch to 121.5 MHz (the international emergency/guard frequency, monitored by all ATC facilities and many aircraft) and transmit. Set your transponder to 7700. Both actions simultaneously alert the entire ATC system to your situation.
PAN-PAN — the urgency call
PAN-PAN (pronounced "pahn-pahn," rhymes with "don") is one step below MAYDAY — used for urgent situations that require priority assistance but are not immediately life-threatening. Examples: getting lost, a passenger having a medical issue, or mechanical problems that are serious but not yet emergencies. Format is the same as MAYDAY but uses "PAN-PAN, PAN-PAN, PAN-PAN" instead.
Transponder emergency codes
| Code | Situation | Notes |
|---|---|---|
| 1200 | VFR flight — default | Set when no other code assigned. All VFR aircraft not receiving flight following. |
| 7700 | Emergency | Immediately alerts all ATC facilities. Set simultaneously with MAYDAY call if possible. |
| 7600 | Radio failure | Lost two-way communications. ATC will look for 7600 and provide light gun signals. |
| 7500 | Hijacking | Triggers immediate security response. Never select accidentally. |
Radio failure procedures: If you lose radio communications at a towered airport, squawk 7600 and watch for light gun signals from the tower. In the pattern: steady green = cleared to land, flashing red = airport unsafe/go elsewhere, alternating red/green = exercise extreme caution. Land, then flash your landing light to acknowledge signals.
- Phonetic alphabet: Alpha through Zulu — know all 26 cold. Numbers spoken digit-by-digit. "Niner" for 9. Headings always 3 digits.
- Radio formula every time: Who you are calling → Who you are → Where you are → What you want.
- Always listen to ATIS before calling ATC at towered airports. Include information letter in your first call.
- CTAF: self-announce at 10 miles, entering pattern, base, final, and clear of runway. Say airport name first and last.
- Towered airports: ground control for taxi, tower for runway operations, approach/departure for en route.
- Mandatory readbacks: runway assignments, hold-short instructions, cleared for takeoff/landing, altimeter settings.
- Flight following: free VFR radar service. Give aircraft type, departure, destination, altitude in your request. Squawk assigned code.
- MAYDAY (life-threatening): transmit 3 times + emergency details. Squawk 7700. Use 121.5 if needed.
- PAN-PAN (urgent, not life-threatening): one step below MAYDAY. Requests priority handling.
- Transponder codes: 1200=VFR, 7700=emergency, 7600=radio failure, 7500=hijacking (never accidentally).