On 24-Oct-2003, "Dan Luke" c172rgATbellsouthDOTnet wrote:

The ADF still may be necessary in some instances, but they are dwindling.
I have an ADF in my airplane that I will keep using as long as it still
works, but I when it breaks, it's gone.


OK, here's a question for those familiar with use of an IFR certified GPS in
non-GPS approaches. The approach plate for the ILS at my home airport (PAE)
plainly states "ADF REQUIRED". The reason is that the missed approach
procedure calls for intercepting and tracking inbound on a specific heading
to the LOM. In looking over a bunch of approaches it is clear to me that
there are a number of ILSs that carry the ADF REQUIRED indication. My
question is, can an approach certified GPS (legally) be used in lieu of an
ADF for navigational guidance in a segment of an ILS procedure that
nominally requires an ADF? If so, how? If not, it seems to me that
ditching the ADF will close off use of many ILS procedures.
--
-Elliott Drucker