A quote out of an A300-600 AMM
GPWS FAULT/OVRD indicator
The GPWS FAULT/OVRD indicator light is located on the pilot's switching panel 402VU and provides a FAULT indication when a system failure has been detected by the GPWC. All ground proximity warnings are inhibited, and no GPWS self-test is possible. If the flap override switch 12WZ is set to the FLAP OVRD position, the GPWS OVRD lamp illuminates.
All warnings inhibited...