Zaphod Beblebrox
I believe that BUSS would still be available via one ADR above FL 250, from my reading of our QRH
it don't say nuthin about descending to FL 250???
These statements show that you are not sure about UAR procedure with the BUSS. There is a definite procedure how you go about it and when and how to get the BUSS. And you are not going to discover it by chance if it happens.
Lantirn, how do you know?
I know that the BUSS is valid below FL250 due to mach number effects in AOA vanes.