Originally Posted by
Sailvi767
It’s SOP at every airline. Both bottles were fired. In addition the bottles are a monitored item in the ECAM.
It's been a long time, but as I recall with an engine fire in flight we would discharge one bottle, then wait for a specified time to see whether the fire warning would go out. If not, then discharge the second bottle. (That would be a bummer out around the ETP between the west coast and Hawaii).
I don't recall about on the ground, but it makes sense to discharge both bottles.
As an aside, I find flying a high-performance Part 23 twin in the flight levels without a fire suppression system not a great place to be.