"Electronic Conspicuity, where are we" article in Nov 20 mag
Posted: Tue Nov 03, 2020 12:27 pm
Hi all
In the article in the Nov edition of LA I raise a couple of points that I believe merit discusion. First, the ADSB integrity standard (SIL / SDA) that will be required for a mandatory EC area. I suggested that it should be SIL 1 but, without significant preasure from us, NATS / CAA may well force it to the same standard as USA EC mandatory areas i.e SIL 3 /SDA 2. If that is allowed to happen, it will render most of our CAA subsidised TSO C199 GPS units obsolete before we even fit them. That then emphasises the point I made under the heading TL3.03 asking the question "Is it really going to be possible to ever get a legal ADSB installation at SIL 3 in a permit aircraft"? It seems to have taken the US experimental world some time to resolve this. It may not be as simple as we may like to imagine.
Ian Fraser
In the article in the Nov edition of LA I raise a couple of points that I believe merit discusion. First, the ADSB integrity standard (SIL / SDA) that will be required for a mandatory EC area. I suggested that it should be SIL 1 but, without significant preasure from us, NATS / CAA may well force it to the same standard as USA EC mandatory areas i.e SIL 3 /SDA 2. If that is allowed to happen, it will render most of our CAA subsidised TSO C199 GPS units obsolete before we even fit them. That then emphasises the point I made under the heading TL3.03 asking the question "Is it really going to be possible to ever get a legal ADSB installation at SIL 3 in a permit aircraft"? It seems to have taken the US experimental world some time to resolve this. It may not be as simple as we may like to imagine.
Ian Fraser