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Ahhh, yes Bacho. Okay. that certainly clarifies your earlier post. That makes sense. Thanks for the input.

You recall correctly Bacho. On the CL604, System 3 lowers the gear. System 2 raises it. You lost me though in your second sentence. “The AC pump for sys2 will not run Weight off Wheels” ??? Sure, it will. The A pumps (1A and 2A) are engine-driven. Everything Normal, operating pressure is from...

yes. Thank You for pointing out that SOP. With the APU powered and on-line, all three B pumps would have been powered. I was addressing Arm’s question in the simplest way possible. I thought he was simply asking if the flight controls would still be powered in a dual engine failed scenario.

Yes. The flight controls on the 604 are hydraulic. Yes. The 604 does have a ram air turbine that deploys if both AC busses are unpowered- as would be the case in a dual engine failure. The RAT would power HYD pump 3B in this scenario to keep adequate HYD pressure to the primary flight controls.