Shaft Mounted Centrifugal Air-Oil Separator System

A centrifugal air-oil separator system for separating oil particles from air in a gas turbine engine system, comprising:

• a rotatable shaft journaled within a housing of the gas turbine engine system, the shaft including an axially extending bore formed at least partially through the shaft;
• a gear integral to or mounted on an outer surface of the shaft and radially extending away from the shaft, the gear comprises gear teeth and a gear web;
• and
• a breather mounted on the shaft and independent from and in contiguous contact with the gear,
• wherein the shaft has a plurality of angularly spaced passageways extending radially outward through the shaft from the bore, wherein the breather includes a plurality of radial holes respectively aligned for fluid communication with the plurality of passageways in the shaft.