Everything here is from the references shown below, with a few comments in an alternate color.
When operating in MANUAL mode, the cabin rate of change should be monitored to maintain a maximum of ±500 FPM. Changes in engine thrust will affect cabin airflow and cause variations in cabin pressure and rates of change.
WHEN OPERATING IN MANUAL MODE, MONITOR CABIN ALTITUDE CLOSELY, ESPECIALLY IN DESCENT, TO ENSURE THAT CABIN ALTITUDE DOES NOT DECREASE TO LESS THAN LANDING FIELD ELEVATION, CARE MUST BE TAKEN TO LAND UNPRESSURIZED WITH OUTFLOW VALVE IN FULL OPEN POSITION.
CLOSELY MONITOR CABIN DIFFERENTIAL PRESSURE. DO NOT ALLOW DIFFERENTIAL PRESSURE TO EXCEED 10.80 PSID.
Continued flight with the TROV full open prevents cabin overheat conditions.
Avoid excessive throttle movements while trying to regain control of the pressurization system.
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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