Providence RI has an ILS DME 34 approach. There is no outer marker, and
the localizer only
FAF is identified only by a DME fix. If you were to fly it localizer
only, you'd need the DME.
The DME fix also provides the altitude reference on the glide slope so
that you can confirm
your altimeter's operation (you do do that, right?). As I understand it,
it is the lack of any other
way to identify that fix (it is over water) that makes the approach an ILS
DME. Of course if you
have a GPS with that intersection in the database....

Greg Esres wrote:

if DME was required on an ILS (and that would be, of course, prior
to the final approach fix), that it would be shown as a "DME required"
note, rather than as part of the name of the procedure.

That's the way it's becoming, but, according to Wally, that's only in
order to conform to ICAO standards.

There ARE some ILS DME approaches out there (or were). Can you
explain how DME would ever be needed to fly final approach on an ILS?

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