There isn't much here other than the AFM procedure. I'll give this more thought when I get a chance.
Everything here is from the references shown below, with a few comments in an alternate color.
FULLY CHARGED MAIN BATTERIES WILL PROVIDE APPROXIMATELY 10 MINUTES OF ELECTRICAL POWER AFTER TWO APU START ATTEMPTS. THE EBHA AND UPS BATTERIES WILL PROVIDE APPROXIMATELY 30 MINUTES OF ELECTRICAL POWER.
The temporary loss of AC electrical power will cause the horizontal stabilizer to fail resulting in the FCS using elevator for pitch trim. After AC power is restored, a FLT CTRL RESET will return normal horizontal stabilizer operation.
CONFIGURE ELECTRICAL SYSTEM TO STAY AT OR UNDER A 100% LOAD ON AC / DC POWER SYSTEMS.
LAND AS SOON AS POSSIBLE WHEN ANY ELECTRICAL CONDITION REQUIRES OPERATION ON MAIN BATTERIES ONLY.
The RAT will power the emergency AC, L ESS DC / R ESS DC busses.
To ensure proper RAT operation, do not reduce airspeed below 200 KCAS.
A MAXIMUM OF TWO 30-SECOND APU START ATTEMPTS MAY BE PERFORMED.
The APU READY light may not illuminate if the APU oil temperature is below the minimum required for start. The APU start is not inhibited and may be attempted.
(1) Go to Step 9.
ENSURE APU IS ONLINE AND GENERATOR IS SELECTED ON PRIOR TO TURNING RAT GEN OFF.
(1) RAT GEN . . . OFF
(2) MAIN FUEL PUMP and ALT FUEL PUMP (Left and Right) . . . ON
(3) APU GEN . . . Load Check
(4) If the APU Generator load is greater than 78%, and flight above 35,000 feet is required:
(a) Refer to 03-04-70, Electric Load Shedding.
(5) If the APU Generator load is less than 78%:
(a) FUEL CROSSFLOW . . . CLOSE
(b) AP . . . DISCONNECT
(c) FLT CTRL RESET . . . PRESS and RELEASE
(d) Airplane . . . Land at nearest suitable airport
(e) Procedure complete.
(1) If the RAT Gen Overload (caution) CAS message is displayed, perform the following, pausing between actions to observe if the CAS message clears:
(a) TAT Probe 1 SSPC 3423 PULL
Either the Left or the Right MAIN FUEL PUMP may be selected off.
(b) MAIN FUEL PUMP (Left or Right) . . . OFF
Fuel balance can be maintained by opening the FUEL INTERTANK and using the side slip technique.
(c) Fuel Balance . . . Monitor and Maintain
1. Refer to 02-08-60, Fuel Balancing in Flight.
Only DU1 and DU4 are available when using the RAT. To view synoptic/system pages on DU 4, refer to 03-16-40, DU Unlatch.
FMS 2 will be inoperative when using the RAT and therefore FMS 1 or FMS 3 must be selected via TSC NAV SRC to view the FMS flight plan on the MAP.
RAT Gen will drop off line below approximately 200 KCAS. To prevent the RAT generator from repeatedly shedding the load then resupplying electrical power, it must be selected OFF prior to decelerating below 200 KCAS.
THRUST REVERSERS WILL NOT BE AVAILABLE.
Gulfstream GVII-G500 Airplane Flight Manual, Revision 4, August 29, 2019
Gulfstream GVII-G500 Production Aircraft Systems, Revision 3, July 15, 2019
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