ICAO Obstacle Limitation Surfaces Task Force (OLSTF) has proposed replacing the current OLS framework with a new dual concept consisting of Obstacle Free Surfaces (OFS) and Obstacle Evaluation Surfaces (OES). In addition, a new classification system—Aeroplane Design Groups (ADG)—is foreseen for the design of the OFS and OES.

Altitude Nexus supports aerodromes and regulatory authorities in understanding this new concept and in developing the associated Obstacle Free Surfaces and Obstacle Evaluation Surfaces.

Furthermore, tailored OES can be established to address the specific operational needs of individual aerodromes, enabling a more efficient and flexible use of surrounding areas.