Where in the QRH is that procedure? (De-activate the spoilers).
It's not, but if you understand the detail of your aircraft's systems then you could make a sensible deduction at how to do it. Primary flight controls on the original Global are all mechanically controlled, hydraulically actuated. Spoilers are electrically controlled (FCU) and hydraulically actuated.
The FCUs do lots of important tasks, but nothing that I can't do without when I may be losing control of the aircraft. So into the EMSCDU, trip FCU 1 & 2 power A & B!