In 1996,
Alaska Airlines became the first airline in the world to utilize an RNP approach with its approach down the
Gastineau Channel into Juneau, Alaska. Alaska Airlines Captain Steve Fulton and Captain Hal Anderson developed more than 30 RNP approaches for the airline's Alaska operations.
Yada yada yada.
Required navigation performance - Wikipedia, the free encyclopedia
The Vref+10 is only for the -400 now. I see that the procedure was amended after my company-provided 2-year+ vacation. So for the NG it is Vref+5.
I'm still not sure why you mention disconnecting the A/T.