Originally Posted by rickair7777

You don't need the blue pump. But if memory serves the RAT is actually not a generator like on other planes... it's a hyd pump that powers the blue system, including the emerg gen which is hyd powered. So you do need blue fluid, plumbing, and reservoir in order for the RAT to power the gen.

I'm uncomfortable flying around business as usual without the blue system, since that's both your last ditch hyd and elec... both of which are required to control the plane. I could live without the blue pump.