As told by it.pilot.737 Shogun-16 may mistake vs. another bus. On hyd arch we can see the RAT on green sys.
On dual hyd, after RAT man extension due to the reason explained by Shogun-16 (The RAT will automatically deploy when you have a dual AC electrical failure), you recover the green, which gives you again slats or flaps according the failure (G+B or G+Y).
is tha RAT able to extend them?
Yes, but slowly. As reported also in the summary.
As per FCTM in case of B+Y the ldg gear extension is always suggested by gravity in order to preserve the green for flight control.
Ciao