Ali Ghorashi wrote:
Hello All,
What does the following NOTAM mean:

GPS 02/001 GPS PRN 26 OTS WEF 0502082100-0502090900

I know it says "GPS Pseudo Random Noise 26 Out of Service" but what
are its
implications? Does it mean that RAIM is not available during the
outage?

Thanks,

-Ali

Maybe, maybe not

It's not at all intuitive what the effect is on RAIM. You can have one
or more OTS and still have RAIM. Or you can have none OTS and still
lose RAIM (although with a fully healthy constellation, the
availability is damn near 100% these days, with 30 operational birds up
there now).

Some handy links:

https://pilotweb.nas.faa.gov/distribution/atcscc.html
https://pilotweb.nas.faa.gov/distribution/home.html


Regards,
Jon