Obstacle Limitation Surfaces (OLS) are one of the quiet heroes of safe aerodrome operations. They define three-dimensional protection surfaces that should remain free from intrusions so aircraft can take off, land and manoeuvre safely.
In the video below, we break OLS down into plain language and show how these surfaces work in practice across Australian aerodromes.
Why this video matters
If you work around an aerodrome, whether in planning, development, surveying, airspace design or operations - you’ll eventually bump into OLS questions. This video gives you a clear, visual explanation of:
- What each OLS surface is and what it protects
- How surfaces relate to runways and surrounding terrain
- Typical triggers for OLS assessments in development and planning
- A practical, real-world scenario located at Cairns Airport (YBCS).
Who will find this useful
- Aerodrome managers and operations staff who field queries from developers
- Town planners and project managers preparing development applications near airports
- Surveyors and engineers who need to verify heights and clearances
- Property developers seeking early risk signals before design lock-in.
Further resources
This video complements standard references and guidance material used across Australia - It’s ideal, as a first step, to gain a high-level overview before deeper technical study or formal assessments conducted by professionals.
Have a question?
If you’re wondering whether your project will affect the OLS of a nearby aerodrome and want a a review, get in touch. We can help you understand which surfaces apply and what that means for your project.
Watch the flythrough:
Tags: Obstacle Limitation Surfaces, OLS, Aerodrome Safety, Airport Planning, Cairns Airport, Aviation Development, Airspace Design
