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After your transmission, ATC tells you “blocked”. What does it mean?

  • A

    You are holding down the push to talk button.

  • B

    Simultaneous transmissions have occurred and you have to repeat your transmission.

  • C

    A pilot has blocked the pathway.

  • D

    Ensure any restriction is not blocked by a pilot acknowledgement.

If, after your transmission, ATC tells you “blocked” then during some or all of your radio call, another aircraft has broadcast at the same time. If 2 stations broadcast simultaneously then the signals interfere with each other, and nothing can be heard clearly on frequency.

In this situation, you will need to repeat the message for ATC.

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