The addition of autobrakes makes this maneuver fairly simple, but the problem of "go" or "don't go" remains. As the PF your eyes will be on the HUD and you will have the speed tape to watch V1 approach. Your PM, on the other hand, will be dividing his or her attention inside and outside. A lot of pilots are of the mindset that they must call "Vee One" at precisely V1 and that is too late, especially in an airplane that accelerates as fast as this one.
If this comes as a surprise to you, see: V1.
Everything here is from the references shown below, with a few comments in an alternate color.
Ground Spoilers should extend automatically when the POWER LEVERS are reduced to idle.
IF DIRECTIONAL CONTROL ISSUES ARE ENCOUNTERED CONSIDERATION SHOULD BE GIVEN TO STOWING THE THRUST REVERSERS TO REGAIN CONTROL.
Of course you still have the engine failure to deal with:
[Ground and Flight Operations, pp. 61-62
Ground Spoilers should extend automatically when the throttles are reduced to idle. During a rejected takeoff, reverse thrust can be used to bring the airplane to a stop if deemed necessary. If reverse thrust is used below 60 KCAS, the event should be recorded and reported for maintenance action. After a rejected takeoff, the cabin pressurization system may still be in the FLIGHT mode of operation. Select the LANDING or RAM mode to allow the aircraft to depressurize.
Gulfstream GVII-G500 Airplane Flight Manual, Revision 4, August 29, 2019
Gulfstream GVII-G500 Ground and Flight Operations, released as part of the GVII-G500 AOM, §02-01-10
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