PANS-OPS: the invisible ceiling over Sydney's skyline

Writing in Australian Aviation, Suzanne Northey of Wollert Capital looks at the aviation rule that most directly caps building heights in inner Sydney. PANS-OPS surfaces are federally mandated imaginary planes that set the maximum height of structures so instrument approaches and departures stay safe. Unlike Obstacle Limitation Surfaces, which can sometimes be negotiated with safety mitigations, PANS-OPS works as a hard ceiling.

The result is visible in the flat-topped skylines of Mascot, Wolli Creek and Alexandria. The piece argues today's settings were shaped around the slow climb of heavy long-haul aircraft relying on less precise ground-based navigation, while modern aircraft climb faster and navigate far more accurately.

Importantly, the author doesn't argue safety away. She notes Australia is bound by ICAO standards, that these surfaces protect emergency and ambulance flights, and concludes that safety must stay non-negotiable while the settings that deliver it should be open to review. That's the balance HAAPA is built on.

Read more: Sydney's Housing Crisis is Stuck in the PANS-OPS Splay, Australian Aviation

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