I am not seeing how a non-gps A320 could have EGWPS...
http://www.skybrary.aero/index.php/A...ia,_2003_(CFIT)
The aircraft received erroneous information from the ADS VOR which was fed to the flight deck VOR display, the FMS, the navigation displays and the EGPWS computer with its associated Terrain Awareness Display (TAD). A single common position source error thus adversely affected all these apparently independent navigation/situational awareness systems. The existing certification standards for the aircraft navigation systems were met but were not sufficient to protect against this problem.