FIELD: machine building.
SUBSTANCE: sump pressurisation system comprising an external source of pressurised air is provided to supplement pressurised air to a bearing sump arrangement, when the operating conditions of the gas turbine engine are such that the on-board pressurised air source, for example the compressor of the gas generator, are such that the air pressure generated thereby is insufficient to pressurise a sump pressurisation cavity. Also described is a gas turbine engine (versions) comprising such a sump pressurisation system. Also described is a corresponding method for operating a gas turbine engine to facilitate reduction of leakage of lubrication oil.
EFFECT: technical result of the invention is to increase sump reliability by preventing burning of lubricating oil.
22 cl, 6 dwg
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