Under which circumstances might a pilot use blind transmission technique?
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A
When the traffic situation at an airport allows the transmission of information which does not need to be acknowledged by the ground station.
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B
When a pilot has flown into cloud or fog unintentionally and therefore would like to request navigational assistance from a ground unit.
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C
When no radio communication can be established with the appropriate aeronautical station, but when evidence exists that transmissions are received at that ground unit.
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D
When a transmission containing important navigational or technical information is to be sent to several stations at the same time.
ICAO Annex 10, Volume II
1.3 Communication methods
Blind transmission. A transmission from one station to another station in circumstances where two-way communication cannot be established but where it is believed that the called station is able to receive the transmission.
When there is a radio communication failure or discrepancy, the pilot may choose to transmit blind to the ATC. This means the pilot will transmit messages even though they cannot hear the ATC's reply, because there is a possibility that the ATC may be able to hear the aircraft transmission. Similarly, the ATC may also transmit blind to an aircraft when there is no radio contact, but it is believed that the aircraft might receive the message.
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Austro Control2
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