The VG control system consists of the VG
hydraulic pump, a hydraulic control unit
(HCU) which houses tor que motor-positioned
hydraulic servos for porting fluid at regulated
pressure, two VIGV actuators, six VBV actua-tors, and two VSV actu ators. The VG hydrau-lic pump is a fixed-displacement design which
supplies pressurized lube oil to the HCU for
delivery to the actuators.