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New ICAO Obstacle Limitation Surfaces (OLS) |
The CAA has published a new dedicated webpage setting out information on the updated ICAO Obstacle Limitation Surfaces (OLS) framework.
The page provides an overview of what is changing, why ICAO has introduced the new approach, and what this means for aerodromes, planners and other stakeholders. The webpage will act as the central hub for new OLS material, including webinar recordings, workshop information, guidance updates and future events as they become available.
In August 2025, ICAO adopted Amendment 18 to Annex 14, introducing a new, modernised Obstacle Limitation Surfaces (OLS) framework, representing the most significant change to aerodrome safeguarding in decades. The new OLS becomes applicable globally from 21 November 2030.
These changes affect all UK aerodromes, safeguarding authorities, developers, and organisations involved in airspace protection, obstacle assessment and planning.
The new framework replaces the long‑standing traditional OLS with a performance‑based, operations‑driven model, reflecting advances in aircraft performance, navigation, and procedure design.
What the New OLS Means for UK Aerodromes
Aerodromes will need to:
- Update safeguarding maps and digital airspace models
- Understand differences in protected volumes (some areas expand, others reduce)
- Assess impacts on development proposals and planning safeguarding processes
- Coordinate with local planning authorities
- Review existing obstacles and update obstacle databases
- Implement new ADG‑based surface modelling
- Plan for transition ahead of 2030 applicability
The new OLS may reduce safeguarding burdens in some cases (less protected airspace), while expanding them in others.
Events, Workshops and Webinars
Upcoming New ICAO OLS Workshops
To support industry readiness ahead of the 21 November 2030 applicability date for the new ICAO Obstacle Limitation Surfaces (OLS), the CAA will be delivering a series of workshops throughout the year. These sessions are designed for aerodrome operators, safeguarding teams, planners, ANSPs, developers, and other stakeholders involved in obstacle management.
Confirmed Workshops
- 3 June 2026 – Manchester
- 17 July 2026 – Gatwick
- 8 October 2026 – Glasgow
Registration for this workshop is currently register‑interest only. Confirmation of available places will be emailed shortly to those who register.
AOPA Comment:
The new ICAO OLS will impact all licensed aerodromes with particular regard to their AIP entries regarding obstacles and may impact unlicensed aerodromes, including private strips, who have lodged a safeguarding map with their Local Planning Authorities (LPAs).