Originally Posted by
IO540
Since RAIM is presumably still required for a TSO146 GPS, is it sensible to file an alternate which is also GPS-only?
The FAA clearly believe so, otherwise why would they have made such a radical change for WAAS-enabled aeroplanes? Presumably it underlines the astonishing level of reliability that's being achieved with GPS/WAAS (although alongside this change a legal requirement
has been introduced for the pre-flight check of WAAS NOTAMS for predicted unreliability or unavailability).