SERA.15010 Transfer of CPDLC

(a)When CPDLC is transferred, the transfer of voice communication and CPDLC shall commence concurrently.

(b)When an aircraft is transferred from an air traffic control unit where CPDLC is available to an air traffic control unit where CPDLC is not available, the termination of CPDLC shall commence concurrently with the transfer of voice communication.

(c)The air traffic controller shall be informed when attempting a transfer of CPDLC resulting in a change in data authority if there are data link messages for which a closure response has not been received. When the air traffic controller decides to transfer the aircraft without receiving pilot responses to the uplink message(s) outstanding, the air traffic controller shall normally revert to voice communication to clarify any ambiguity associated with the uplink message(s) outstanding.