OIL SYSTEM D/O (3)DESCRIPTION (continued)OIL PUMP ASSEMBLYOil pump assembly is installed on the rear face of the external gearbox.It has eight gyrotor type pumps. There is one pressure section pumpunit, which raises the oil pressure to the bearings and gears. There arealso seven scavenge section pump units, which scavenge oil from thevarious areas of the engine back to the oil tank. The pump units areassembled into a pump stack on a single drive shaft.