Gas turbine engine lube oil system

A gas turbine engine lube oil system comprising:

• a first elongated compartment having
• a closed end, and
• a first open end distal to the closed end;
• a second elongated compartment parallel and adjacent to the first elongated compartment, the second elongated compartment having
• a suction end adjacent to the closed end, and
• a second open end distal to the suction end and adjacent to the first open end;
• and a sub-divided containment area having
• a first compartment in flow communication with the first open end,
• a second compartment in flow communication with the second open end, and
• a flow transfer compartment in flow communication with the first compartment at a location distal to the first open end and in flow communication with the second compartment at a location distal to the second open end,
• wherein bulkheads sub-divide the first compartment, the second compartment, and the flow transfer compartment;
• wherein the first elongated compartment and first compartment form a first passage and the second elongated compartment and second compartment form a second passage, and the first passage is configured to connect to a of bearing return lines.

A method for deaerating lube oil in a gas turbine engine lube oil system, the method comprising:

• returning lube oil from gas turbine engine bearing assemblies to a first passage of an elongated passage lube oil tank;
• flowing the lube oil from bearing return line connection points in the first passage through the first passage to a first flow transfer connection point and away from a closed end of the first passage, the first flow transfer connection point being distal to the closed end of the first passage;
• transferring the lube oil from the from the first flow transfer connection point to a second flow transfer connection point of a second passage of the elongated passage lube oil tank by a flow connection means, the second passage being in flow isolation from the first passage except for the flow connection means;
• and
• flowing the lube oil from the second flow connection point to a suction end of the second passage, the second flow connection point being distal to the suction end.