Thomas Borchert wrote:
The FAA, and the rest of the world as well, want to eventually shut-down
the VORs. The only remaining ground-based systems will be ILSes.



Uhm, not quite. The JAA is all hot about DME-DME area navigation. They
thing GPS is not reliable enough. Go figure...

The JAA agenda is politically-driven. They simply don't want to use
those Dammn Yankee's GPS system. Also, in most of the JAA airspace,
there is a DME-rich environment, which is great for en route. But, the
model often collaspes on approach as the DMEs drop out and the remaining
two, or so, provide unacceptable geometry. If it is an RNP platform,
the alerts will become sufficiently dire to force a missed approach.

I am involved in the recent RNAV RNP programs. The JAA just quietly
looks the other way when some of its member states begin their journey
into performance-based RNAV (RNP) procedures that require GPS and IRUs
blended with advanced FMS platforms. DME/DME is simply not in that picure.

Go figure.