In case the APU fire bottle Pressure gage is not installed.How do you know that the pressure is below minimum [I know discharge will be indicated by pr sw on Fire control panel in cockpit]
Is there any special checks like weighing the Bottle once a day etc.
Whats the MEL say for a U/s Apu pr gage,is the APU declared U/s.
I may not win often, but I damn well never lose!!!