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In radiotelephony communication, which phrase shall be used if you want to say: "Communication is difficult. Please send every word or group of words twice"?
  • A
    Repeat twice.
  • B
    Say again, say again.
  • C
    Message second time.
  • D
    Words twice.
ICAO Annex 10, Volume II
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 BREAK “I hereby indicate the separation between messages transmitted to different aircraft in a very busy environment.”
CANCEL “Annul the previously transmitted clearance.”
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.”
I SAY AGAIN “I repeat for clarity or emphasis.”
GO AHEAD “Proceed with your message.”
Note.— Not used whenever the possibility exists of misconstruing “GO AHEAD” as an authorization for an aircraft to proceed. The phrase “GO AHEAD” may be omitted and, in its place, a response made by using the calling aeronautical station’s call sign followed by the answering aeronautical station’s call sign.
MONITOR “Listen out on (frequency).”
NEGATIVE “No” or “Permission not granted” or “That is not correct” or “Not capable”.
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...”
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 part of your last transmission”
SPEAK SLOWER “Reduce your rate of speech.”
UNABLE “I cannot comply with your request, instruction, or clearance.” Note.— UNABLE is normally followed by a reason.
STANDBY “Wait and I will call you.”
Note.— The caller would normally re-establish contact if the delay is lengthy. STANDBY is not an approval or denial.
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 this message will be sent twice.”
Note: We have created the above table based on the questions you may find in your exam, however the table is not extensive. Further radiotelephony words and phrases can be found in ICAO Annex 10, Volume II.

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