Originally Posted by
offa
Reverser not deployed on #1 (i.e. FWD thrust) due loss of hydraulic #1 and (sounds like) lots of reverse on #2 would make it near impossible to maintain directional control much below 100 kts as rudder effect is lost.
Full reverse on one engine with the other engine at forward idle is controllable using rudder only down to ~60 knots (which, not coincidentally, is the speed at which you're supposed to be down to reverse idle). That's actually a regulation and gets demonstrated during certification.
If the engine in forward
isn't at idle (or shut down), all bets are off...