Work on SID and STAR phraseology changes and cancellation of level restrictions identified fundamental issues regarding ICAO procedures for terrain and obstacle clearance, primarily whether a restriction is ATC or terrain based.
IFATCA Policy is:All published altitude restrictions should indicate whether they apply for reasons of terrain avoidance. ICAO documentation should provide clear and unambiguous language with regard to responsibility for terrain avoidance, including amendment to the Objectives of air traffic services to include the prevention of collisions between aircraft and terrain. ATCOs should be provided with ATS surveillance tools and/or procedures to efficiently separate aircraft from terrain and obstacles. |
| See: Resolution B3 – WP 86 – Gran Canaria 2014, Resolution B2 – WP 85 – Gran Canaria 2014, Resolution B9 – WP 92 – Sofia 2015 |
Last Update: August 11, 2022
November 4, 2019 911 Jean-Francois Lepage ATS