SERA.15030 Controller data link communication procedures for emergencies, hazards, and CPDLC equipment failure

(a)When an air traffic controller or a pilot is alerted that a single controller-pilot data link communication message has failed, the air traffic controller or the pilot shall take one of the following actions, as appropriate:

(1)via voice, confirm the actions that will be taken with respect to the related dialogue, prefacing the information with the phrase: “CPDLC MESSAGE FAILURE”;

(2)via controller-pilot data link communication, reissue the controller-pilot data link communication message that failed.

(b)Air traffic controllers that are required to transmit information concerning a complete controller-pilot data link communication ground system failure to all stations likely to intercept should preface such a transmission by the general call: “ALL STATIONS CPDLC FAILURE” - followed by the identification of the calling station.

(c)When controller-pilot data link communication fail and the communication reverts to voice, all CPDLC messages outstanding shall be considered not delivered and the entire dialogue involving the messages outstanding shall be recommenced by voice.

(d)When controller-pilot data link communication fails but is restored prior to a need to revert to voice communication, all messages outstanding shall be considered not delivered and the entire dialogue involving the messages outstanding shall be recommenced via CPDLC.