On Apr 17, 10:18 am, Peter Clark
wrote:
On 17 Apr 2007 09:04:53 -0700, wrote:

It's hard to imagine anyone thinking an expired GPS database would
prevent you from using the *other* navigational equipment in your
airplane - like an ADF or the independent VOR/ILS in the 430.

I don't think anyone does, except in the cases where you are required
to substitute because you don't have an ADF or DME and the precision
or VOR/DME style approach requires the GPS be used as a substitute for
ADF or DME. AIUI at that point you have to have the real equipment or
a current database.

Yes and no. To use the GPS to substitute for DME on a VOR-DME
approach is an approach operation. It requires a C129(A1) certified
box with a current database. However, if the *missed approach*
requires say, for you to navigate to an NDB for which you are
substituting GPS, that is a terminal operation which only requires
C129(A2) certification and can be flown with an expired database,
provided you have validated the NDB lat/lon.
Earlier in the thread you specified substituting GPS for the MAPH
HP. That is the second situation.