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English language
"International Radiotelephony Spelling Alphabet"


Words 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.
BREAK BREAK 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
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 (or message indicated). 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 given or last
MONITOR Listen out on (frequency).
NEGATIVE No or Permission not granted or That is not correct or not capable
OVER My transmission is ended and I expect a response from you. (military use)
READ BACK Repeat all, or the specified part, of this message back to me exactly as received.
RECLEARED A change has been made to your last clearance and this new clearance supersedes your previous clearance or part thereof.
REPORT Pass me the following information ...
REQUEST I should like to know ... / 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.
STANDBY 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
WORDS TWICE Communication is difficult. Please send every word or group of words twice.