Originally Posted by
deltahotel
I guess it’s a back up to the Boeing procedure which is fire Btl 1, if still burning after 30sec fire Btl 2, if still burning after 20 sec stop the fire drill and initiate the evacuation ck list. Reminder that the APU has its own extinguisher so you now know that everything that can be done has been done.
Discharging the second fire extinguisher bottle is literally the final step in the evacuation checklist, after the evacuation has already been ordered. So again I don’t see whats the point.