Yes, those are the main points. When I deliver training / consultancy in this area those are all the points I try to get across.

However I don't wholly agree with the bottom line: increasing safety can actually decrease reliability and availability. A safety critical system will  typically shut down if it can't be proven to be safe, which is different to saying it will shut down if it becomes unsafe - if/when the protective system fails (or falsely detects) then you will have a less reliable system than if the protective system hadn't been fitted. 

So personally I'd change the sentence "...and a bi-product of managing technical safety?" to "...and a bi-product of following these principles?"  Applying these principles develops all aspects of RAMS - but there may be a trade off between safety risk and reliability / availability risk.

Thanks,

Andy

Yes, those are the main points. When I deliver training / consultancy in this area those are all the points I try to get across.

However I don't wholly agree with the bottom line: increasing safety can actually decrease reliability and availability. A safety critical system will  typically shut down if it can't be proven to be safe, which is different to saying it will shut down if it becomes unsafe - if/when the protective system fails (or falsely detects) then you will have a less reliable system than if the protective system hadn't been fitted. 

So personally I'd change the sentence "...and a bi-product of managing technical safety?" to "...and a bi-product of following these principles?"  Applying these principles develops all aspects of RAMS - but there may be a trade off between safety risk and reliability / availability risk.

Thanks,

Andy