SERA.14085 Use of blind transmission

Francisco Javier • 17 January 2023

in community General Aviation

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(a) When an aircraft fails to establish contact on the designated channel, on the previous channel used or on another channel appropriate to the route, and fails to establish communication with the appropriate ATS unit, other ATS unit or other aircraft using all available means, the aircraft shall transmit its message twice on the designated channel(s), preceded by the phrase ‘TRANSMITTING BLIND’ and, if necessary, include the addressee(s) for which the message is intended.

(b) When an aircraft is unable to establish communication due to receiver failure, it shall transmit reports at the scheduled times, or positions, on the channel in use preceded by the phrase ‘TRANSMITTING BLIND DUE TO RECEIVER FAILURE’. The aircraft shall:
(1) transmit the intended message, following this by a complete repetition;
(2) advise the time of its next intended transmission;
(3) when provided with ATS, transmit information regarding the intention of the pilot-in-command with respect to the continuation of the flight.

When we talk about part b, "receiver failure", do you mean if i'm flying the ATC station fails its receiver?
Or is it the receiver of my radio that fails?

Thanks in advance for your answers.

Comments (7)

Keno Martens • 1 year ago

Hi Francisco,
"due to receiver failure" means, that you can transmit but not receive with your radio, which is why you are also transmitting twice.
It shall ensure that ATC receives all necessary information about your intentions and due to your failing radio receiving ATC could not come back to you with further questions in case of need.

Hope this helps!

Francisco Javier • 1 year ago

Thanks for your answer Keno, but I still have the question, what is the difference between, a) blind transmission and b) blind transmission due to receiver failure?, it seems that the two forms of transmission are for the same reason.

Keno Martens • 1 year ago

[~40595] Hi Francisco,
Ok; sorry misunderstood the question.
I am also not a 100% certain if I am correct, but I like to remember the main difference between those two is, that in case b) (transmission due to receiver failure) you already know for fact that it is your receiver that is definitely inoperable, but in case a) (blind transmission) you only assume so.

Daniel Biton • 1 year ago

Like Keno Martins, I understand that my receiver is down.
I cannot prouve the receiver of the ATC is down, therefore the message concerns my own receiver.

D.B.

Paolo Montanari • 1 year ago

I agree with the above comment.In this case you should also squack 7600 on the trasponder. it means "radio failure"

Sjoerd Postma • 1 year ago

A blind transmission (without receiver failure) can also be done if you are out of range of the ATC station but entering their area (or FIR). The blind transmission is made if you do not receive a reply on your initial call, but it cannot be excluded that the ATC station is receiving you. E.g. "Gander Radio [own call sign] transmitting blind, position XYZ at time 12:50, maintaining FL55."

Paolo Montanari • 1 year ago

The case a) is a general situation which does not mean a failure of any kind.It can be when you like to enter a traffic circuit where the tower is not present or out of operative hours.In this case you inform the other traffics in circuit of your intention.Some times it is even reccomended in the map and rules of that airport. The case a) is generally applicable any time you intend to inform all other traffic around of your presence.For example when you fly a wide area covered by a Flight Information Service Station (FIS) in space G very far from your position.You receive them because of their power trasmission by they cannot receive you due to your low power radio,nevertheless you want to inform the other traffic around you ,who listen the same FIS ,of your presence

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