On Wed, 25 Aug 2004 16:49:11 GMT, "Dude" wrote:

I thought that an IFR GPS was a legal substitute for an ADF in ALL cases????

I don't know all of the in's and out's that apply to TSO129 certified
equipment, so my conclusions may be incorrect.

My understanding is that if you are flying IFR, and have a TSO129 box, and
require an alternate, the AIM says that:

"Any required alternate airport must have an approved instrument approach
procedure other than GPS that is anticipated to be operational and
available at the estimated time of arrival, and which the aircraft is
equipped to fly."

So if you are choosing an NDB approach at your alternate airport, you would
need to have a functioning ADF receiver on board.


--ron