ICAO Radio Pronunciation
Pronunciation practice for aviation radio communication.
Radio communication needs clear pronunciation, controlled speed and standard phraseology. Pilots and controllers may speak with different accents, so the goal is not a perfect native accent. The goal is safe, understandable communication.
ICAO Spelling Alphabet
The ICAO alphabet helps avoid confusion when spelling callsigns, waypoints and important information.
| Letter | ICAO word | Pronunciation help |
|---|---|---|
| A | Alpha | AL-fah |
| B | Bravo | BRAH-voh |
| C | Charlie | CHAR-lee |
| D | Delta | DELL-tah |
| E | Echo | ECK-oh |
| F | Foxtrot | FOKS-trot |
| G | Golf | GOLF |
| H | Hotel | hoh-TELL |
| I | India | IN-dee-ah |
| J | Juliett | JEW-lee-ETT |
| K | Kilo | KEY-loh |
| L | Lima | LEE-mah |
| M | Mike | MIKE |
| N | November | no-VEM-ber |
| O | Oscar | OSS-cah |
| P | Papa | pah-PAH |
| Q | Quebec | keh-BECK |
| R | Romeo | ROH-me-oh |
| S | Sierra | see-AIR-rah |
| T | Tango | TANG-go |
| U | Uniform | YOU-nee-form |
| V | Victor | VIK-tah |
| W | Whiskey | WISS-key |
| X | X-ray | ECKS-ray |
| Y | Yankee | YANG-key |
| Z | Zulu | ZOO-loo |
ICAO Number Pronunciation
Numbers must be pronounced clearly because they often contain altitude, heading, speed, frequency and runway information.
1Basic Numbers
- 0: zero
- 1: wun
- 2: too
- 3: tree
- 4: fower
- 5: fife
- 6: six
- 7: seven
- 8: ait
- 9: niner
2Practice Examples
- Runway 27: runway too seven
- Heading 180: heading wun ait zero
- Flight level 350: flight level tree fife zero
- Frequency 118.7: wun wun ait decimal seven
- Squawk 4201: squawk fower too zero wun
3Common Problem Numbers
Many speakers confuse three and tree, five and fife, nine and niner. Practise these slowly first, then in full radio phrases.
- tree / fife / niner: Say them clearly and separately.
- decimal: Use decimal for frequencies, not point.
Radio Phrase Pronunciation
Practise these phrases with steady rhythm and clear endings.
1Readback Phrases
- Cleared for take-off runway two seven.
- Climb flight level three five zero.
- Turn left heading one eight zero.
- Descend altitude four thousand feet.
- Contact tower on one one eight decimal seven.
2Clarification Phrases
- Say again, please.
- Confirm heading one eight zero.
- Unable due to weather.
- Request vectors back to the airport.
- We are unable to maintain altitude.
3Emergency Phrases
- Mayday, Mayday, Mayday.
- We have engine failure.
- Request immediate descent.
- We require priority landing.
- There is smoke in the cockpit.
Problem Sounds in Aviation English
These sounds often cause misunderstanding on the radio.
| Sound / Word | Problem | Practice phrase |
|---|---|---|
| three / tree | TH can be unclear on radio. | Flight level tree tree zero. |
| five / fife | Final /v/ may disappear. | Climb flight level tree fife zero. |
| nine / niner | Can sound like five. | Squawk niner two zero fower. |
| left / right | Direction must be very clear. | Turn left heading two seven zero. |
| hold / cleared | Opposite operational meaning. | Hold short runway two seven. |
| climb / descend | Altitude instruction must be clear. | Descend altitude six thousand feet. |
ICAO Radio Pronunciation Quiz
Check your knowledge of aviation pronunciation and radio phraseology.
1. How should the number 9 be pronounced in ICAO radio communication?
2. How should the number 5 be pronounced?
3. What should you say if you did not understand a message?
4. What word should be used in a frequency such as 118.7?
5. Which phrase is clearer for radio communication?
Good radio pronunciation is controlled and predictable.
Use ICAO words, pronounce numbers clearly and ask for repetition when necessary. On the radio, safe communication is more important than speaking fast.
Clear. Standard. Calm. Confirmed.
Practise numbers again
