ICAO Phraseology Reference
Standard aviation communication phrases, NATO phonetic alphabet, and number pronunciation guide.
Acknowledge
Let me know that you have received and understood this message
Affirm
Yes
Approved
Permission for proposed action granted
Break
I hereby indicate the separation between portions of the message
Cancel
Annul the previously transmitted clearance
Check
Examine a system or procedure
Cleared
Authorized to proceed under the conditions specified
Confirm
I request verification of: (clearance, instruction, action, information)
Contact
Establish communications with...
Correct
True or accurate
Correction
An error has been made in this transmission. The correct version is...
Disregard
Ignore
How do you read?
What is the readability of my transmission?
I say again
I repeat for clarity or emphasis
Maintain
Continue in accordance with the condition(s) specified
Monitor
Listen out on (frequency)
Negative
No, or permission not granted, or that is not correct
Over
My transmission is ended, and I expect a response from you
Out
This exchange of transmissions is ended and no response is expected
Read back
Repeat all, or the specified part, of this message back to me exactly as received
Report
Pass me the following information
Request
I should like to know... or I wish to obtain...
Roger
I have received all of your last transmission
Say again
Repeat all, or the following part, of your last transmission
Speak slower
Reduce your rate of speech
Stand by
Wait and I will call you
Unable
I cannot comply with your request, instruction, or clearance
Wilco
I understand your message and will comply with it (Will Comply)
Words twice
Communication is difficult. Please send every word twice
Line up and wait
Enter the runway and wait for takeoff clearance
Cleared for takeoff
Permission to begin takeoff roll
Cleared to land
Permission to land on the specified runway
Go around
Discontinue approach and climb to circuit altitude
Hold short
Stop before reaching the specified point
Taxi
Move the aircraft on the ground under its own power
Vacate
Leave the runway
Traffic in sight
I can see the reported traffic
Touch and go
Land and immediately take off again
Squawk
Set transponder code to the specified value
Mayday
Distress signal - immediate assistance required (say three times)
Pan-Pan
Urgency signal - urgent assistance needed (say three times)