(From ICAO Manual of Radiotelephony)
The following words and phrases shall be used in radiotelephony communications
as appropriate and shall have the meaning given below. ICAO Ref.-2.6
Word/Phrase Meaning
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. (To be used where
there is no clear distinction between the text and other portions of the message.)
Break Break1
I hereby indicate the separation between messages transmitted to different aircraft
in a very busy environment.
Cancel Annul the previously transmitted clearance.
Check Examine a system or procedure. (No answer is normally expected.)
Cleared Authorized to proceed under the conditions specified.
Confirm Have I correctly received the following …? or Did you correctly receive this message?
Contact Establish radio contact with . . . .
Correct That is correct.
Correction An error has been made in this transmission (or message indicated). The correct version is ….
Disregard Consider that transmission as not sent.
Go ahead:
Proceed with your message.
How do you read What is the readability of my transmission?
I say again I repeat for clarity or emphasis.
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.
SOTE: Sol normally used in VHF communications.
Out This exchange of transmissions is ended and no response is expected.
NOTE: Normally used to indicate the end of an exchange of transmissions.
Read back Repeat all. or the .specified pan. of this message back to me exactly as received.
A change has been made to your last clearance and this new clearance supersedes
your previous clearance or part thereof.
Pass me the following information.
Request I should l i ke to know . . . . or I wish to obtain . . . .
Roger I have received all of your last transmission.
NOTE: Under no circumstances to be used in reply to a question requiring ‘Read back’
or a direct answer in the affirmative (Affirm) or negative (Negative).
Say again Repeat all, or the following pan. of your last transmission.
Speak slower Reduce your rate of speech.
Standby Wait and I will call you.
Verify Check and confirm with originator.
Wilco (Abbreviation for ‘will comply’.) I understand your message and will comply with it.
Words twice a) As a request;
Communication is difficult. Please send every word or group of words twice.
b) As information:
Since communication is difficult, every word or group of words in the message
w i l l be sent twice.