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QDB
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Have you sent message ... to ... ?
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I have sent message ... to ...
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Aeronautical Code signals
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QCY
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I am working on a trailing aerial.
Work on a trailing aerial.
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Aeronautical Code signals
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QCX
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What is your full call sign?
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My full call sign is …
Use your full call sign until further notice.
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Aeronautical Code signals
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QCS
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My reception on ... frequency has broken down.
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Aeronautical Code signals
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QCI
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Make a 360-degree turn immediately (turning to the ...).
I am making a 360-degree turn immediately (turning to the ...).
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Aeronautical Code signals
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QCH
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May I taxi to ... (place)?
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Cleared to taxi to ... (place).
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Aeronautical Code signals
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QCF
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Delay indefinite. Expect approach clearance not later than ... hours.
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Aeronautical Code signals
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QCE
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When may I expect approach clearance?
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Expect approach clearance at ... hours.
No delay expected.
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Aeronautical Code signals
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QCB
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Delay is being caused by …
1) your transmitting out of turn.
2) your slowness in answering.
3) lack of your reply to my …
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Aeronautical Code signals
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QCA
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May I change my flight level/altitude from ... to ... ?
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You may change your flight level/altitude from ... to …
I am changing my flight level/altitude from ... to …
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Aeronautical Code signals
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