A320 questions

[z.khalid]

What happens exactly when ONLY the blower is set to override, or when ONLY the extract is set to over ride.
And what happens when they are BOTH on over ride?

Also. The two manual rat extentions, one on the hyd panel, and one on the emerg elect panel.
Basically if you lose your blue HYD system, you will use the one one the hyd system, and at emergency electrical config, you use the one on the emergency electric panel, where the RAT will extend, and in addition it will bring the emergency generator to the line?

Thanks!

[babotika]

FCOM DSC-21-30-20-P (or 1.21.30):

When the BLOWER or the EXTRACT pushbutton switch is set at the OVRD (override) position, the system is in closed-circuit configuration and adds air from the air conditioning system to the ventilation air.

When the BLOWER pushbutton switch is set at OVRD, the blower fan is stopped and the extract fan continues to run.
When the EXTRACT pushbutton switch is set at OVRD, the extract fan is controlled directly from the pushbutton. Both fans continue to run.

When both the BLOWER and the EXTRACT pushbuttons are set to the OVRD position, the air conditioning system supplies cooling air, which is then exhausted overboard. The blower fan stops.

You're correct about the RAT logic. Once the AC and DC ESS busses have been switched to the EMER GEN there is no way to recover them inflight.