There are situations present within the ATN CPDLC SARPs in which the use of LACKs is necessary to have the system perform in an operationally acceptable way. However, the deployment of such systems as FANS 1/A does not utilise this facility.
ICAO Doc 9694-AN/955, Manual of Air Traffic Services Data Link Applications: Page IV-3-4, para. 3.29, the logical acknowledgement provides confirmation from a receiving system to the message originator that the message has been successfully received and is acceptable for display to the responsible person, if this is required. The logical acknowledgement in no way replaces any required operational response.
IFATCA Policy is:On receipt of a CPDLC message, an automated acknowledgement should be transmitted by the receiver (an operational response from the ATCO is still required). A timer function should be utilised in an effort to prevent obsolete CPDLC instructions/clearances being actioned by the flight crew. |
| See: WP 87 – Geneva 2001, Resolution B5 – WP58 – Virtual 2022 |
Last Update: July 18, 2022