On Mar 5, 12:25 am, "Jim Macklin"
wrote:
The FAA removes the ID when the radio facility is out of
tolerance and "not in service"

Perhaps the FAA does.

Here is a fun video of an aborted landing in Apia Samoa.

This video describes the post analysis of an avoided accident.

Apparently, there is a maintenance mode (control monitor bypass mode)
of an ILS glide slope transmitter.

In this mode, any GS receiver tuned to that ILS will immediately
conclude an on-glide slope condition. Regardless of position!

The ident, of course, only indicates a functioning localizer.

http://www.youtube.com/watch?v=GelRBhJ4gmI

ak.