Patent ID: 8443582

Claim:
A lubricant supply system for a gas turbine engine comprising: a lubricant pump delivering lubricant to an outlet line, said outlet line splitting into at least a hot line and into a cool line, said hot line being directed primarily to locations associated with the engine that are not intended to receive cooler lubricant, and said cool line being directed through one or more heat exchangers at which lubricant is cooled, and said cool line then being routed to a fan drive gear for the associated gas turbine engine; at least one of said one or more heat exchangers is a fuel/oil cooler at which the lubricant will be cooled by fuel leading to a combustion section for the gas turbine engine, and said fuel/oil cooler being downstream of a point where said outlet line splits into said at least said hot line and said cool line, such that said hot line is not directed through said fuel/oil cooler; and wherein a valve is positioned on said cool line and splits said cool line into two lines, with a first line being directed through said fuel/oil cooler and the lubricant in said cool line not being directed to the fuel/oil cooler being directed to at least one other cooler through a second line.