SERA.15025 Correction of CPDLC messages

(a)When a correction to a CPDLC message is deemed necessary or when the contents of such a message need to be clarified, the air traffic controller and the pilot shall use the most appropriate means available for issuing the correct details or for providing the necessary clarification.

(b)When voice communication is used to correct a CPDLC message for which no operational response has yet been received, the controller’s or the pilot’s voice transmission shall be prefaced by the phrase: “DISREGARD CPDLC (message type) MESSAGE, BREAK” – followed by the correct clearance, instruction, information or request.

(c)When referring to and identifying the CPDLC message to be disregarded, caution shall be exercised in its phrasing so as to avoid any ambiguity with the issue of the correction to the clearance, instruction, information or request.

(d)If a CPDLC message that requires an operational response is subsequently negotiated via voice, an appropriate CPDLC message closure response shall be sent to ensure proper synchronisation of the CPDLC dialogue. This may be achieved either by explicitly instructing the recipient of the message via voice to close the dialogue or by allowing the system to automatically close the dialogue.