Planetary gear system arrangement with auxiliary oil system

A method of designing a gas turbine engine comprising:

• configuring a speed reduction device for driving a fan;
• configuring a lubrication system for lubricating components across a rotation gap, the lubrication system including a lubricant input, a stationary first bearing receiving lubricant from said lubricant input and having a first race in which lubricant flows, and a second bearing for rotation within said first bearing, said second bearing having a first opening in registration with said first race such that lubricant may flow from said first race through said first opening into a first conduit;
• and
• configuring said first bearing to also include a second race into which lubricant flows, and said second bearing having a second opening in registration with said second race such that lubricant may flow from said second race through said second opening into a second conduit, with said first and second conduits delivering lubricant to distinct locations.