Downstream Clearances

One of the fundamental operational principles that have been incorporated in the draft ICAO Manual of Air Traffic Services (ATS) Data Link Applications Draft Version 0.4 from the beginning is that any ATS data link system must only allow one ATSU (ATS Unit) to be capable of communicating with a given aircraft at any one time. This requirement was felt to be necessary to ensure that there would be no confusion by the aircrew that a clearance or instruction delivered by the data link system actually came from the proper controller (or controller team). It is therefore essential that when downstream clearances delivered via datalink are in use i.e. including the current controlling authority that sufficient safeguards are in place.

IFATCA Policy is:

Where Downstream Clearance capability is provided via Data Link, sufficient safeguards must be implemented in accordance with the ICAO Doc 9694 Manual of Air Traffic Services Data Link Applications, First Edition 1999.

See: WP 115 – Taipei 1997, WP 81 – Toulouse 1998 and WP 90 – Dubrovnik 2009

Route Clearances

IFATCA Policy is:

A route clearance issued to an aircraft should be to destination.

See: Resolution B7 – WP 85 – Punta Cana 2010

IFATCA Policy is:

If an ATC unit changes a route then that ATC unit should ensure that the new route rejoins the current flight plan route.

See: Resolution B8 – WP 85 – Punta Cana 2010


Last Update: October 2, 2020  

November 4, 2019   322   Jean-Francois Lepage    ATS    

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