Understanding Protected Airspace Beyond the Obstacle Limitation Surface (OLS)

When assessing development around an airport, many are familiar with the Obstacle Limitation Surface (OLS). However, a misconception in aviation planning is that if a proposed structure sits below the OLS, it is therefore deemed acceptable.

What is the OLS?

The Obstacle Limitation Surface is a series of defined imaginary surfaces surrounding an airport that protect aircraft during visual operations. These surfaces help identify obstacles that may affect the safe movement of aircraft during take-off, landing and manoeuvring in the vicinity of an aerodrome. 

The OLS forms an essential part of airport safeguarding, but it is only one component.

Beyond the OLS

Many Australian airports support instrument flight procedures that rely on additional protected airspace known as PANS-OPS surfaces (Procedures for Air Navigation Services - Aircraft Operations). Unlike the OLS, these surfaces are designed to protect aircraft flying instrument approach and departure procedures, often extending further from the airport and reaching higher altitudes.

A structure that complies with the OLS may still penetrate a protected PANS-OPS surface, potentially affecting the safety or usability of an instrument flight procedure.

Each development is unique, requiring an assessment based on its location, height, characteristics and proximity to aviation infrastructure. Engaging aviation specialists during the concept design phase allows potential airspace constraints to be identified early, providing greater certainty for developers, planners and approval authorities.

Early consideration also helps avoid situations where a project complies with local planning controls but creates unacceptable impacts on aviation operations.

At Aviation Projects, our team undertakes comprehensive aviation impact assessments that consider the full range of operational airspace protections, helping clients identify potential issues early and navigate planning requirements with confidence. Contact us.