marvic wrote on Sep 26^th, 2012 at 10:04pm:

Markoz wrote on Sep 26th, 2012 at 4:07am: I did a few test flights in mine and it works fine. But to be absolutely sure, which model is it (-100, -200, -200ADV, -200C or -200F)? All of them? I also did a few tests with mine and it does work, although I never use it. One thing for sure, the GPS was an after thought as an AID to the VOR nav. It was not designed as the sole NAV unit.

There is no solution to a problem from those whom it DOES work and there is no practical reason why it should not work. The use or not use of the GPS nav is or should be a user preference and have the capability to do so. Plus, many 727 's in use to day have modern avionic upgrades.