What does robustness mean in the context of UK SORA?
Robustness combines the safety gain provided by a mitigation with the level of assurance and integrity that the safety gain has actually been achieved.
In practice it means the CAA assesses not just what mitigations you claim, but how well you can prove they will work. High robustness typically requires independent validation or certification evidence.
For more details on SAIL levels, read our in-depth guide.
Related Questions
Is a SAIL level the same as an approval?
No, it is not.
What SAIL level do I need for BVLOS operations?
There is no fixed SAIL level for BVLOS. The level depends on where you fly, the size of your aircraft, and what mitigations are in place.
What is the difference between Ground Risk Class (GRC) and Air Risk Class (ARC)?
GRC (Ground Risk Class) measures the potential consequence of a UAS impact on people on the ground. ARC (Air Risk Class) measures the likelihood of an encounter with aircraft.