Abstract: Systems, apparatus, articles of manufacture, and methods are disclosed for lubricating a gas turbine comprising: a reservoir configured to store a lubricant; a supply pump configured to pump the lubricant from the reservoir to a component of the gas turbine engine via a supply conduit; a scavenge pump configured to pump the lubricant from the component; and a valve fluidly coupled with the scavenge pump, the valve to control a flow of the lubricant to the reservoir; and an external pressure source coupled with the valve, the external pressure source to provide a pressure to actuate the valve from a supply position to a bypass position, wherein in the bypass position the valve fluidly couples the lubricant flowing through the scavenge pump into a bypass conduit, the bypass conduit extending from the valve to a location downstream of the supply pump.

Abstract: A flow vortex spoiler including an oil sump wherein pressurization air flow moves about the oil sump through a sump pressurization cavity, the cavity having an inlet, a circumferential plate disposed across a portion of the pressurization cavity near the inlet. The circumferential plate is disposed at said inlet to said sump pressurization cavity. The circumferential plate has a plurality of closely spaced apertures. The pressurization air has a radial component and a tangential component wherein the circumferential plate and the plurality of closely spaced apertures substantially reduce the tangential component of the pressurization air and further wherein the vortex spoiler inhibits excessive pressure change within the pressurization cavity and inhibits oil leakage at seals adjacent to the oil sump.

Abstract: A flow vortex spoiler including an oil sump wherein pressurization air flow moves about the oil sump through a sump pressurization cavity, the cavity having an inlet, a circumferential plate disposed across a portion of the pressurization cavity near the inlet. The circumferential plate is disposed at said inlet to said sump pressurization cavity. The circumferential plate has a plurality of closely spaced apertures. The pressurization air has a radial component and a tangential component wherein the circumferential plate and the plurality of closely spaced apertures substantially reduce the tangential component of the pressurization air and further wherein the vortex spoiler inhibits excessive pressure change within the pressurization cavity and inhibits oil leakage at seals adjacent to the oil sump.