Geared turbofans must be able to withstand loss of lubrication, which can be caused by unavoidable flight maneuvers such as windmilling and negative-g. Corresponding specifications place challenging demands on the gears, which can currently only be met with secondary oil supply systems. Omission of these would reduce space, weight and thus also emissions. However, this presupposes that geared turbofans can withstand loss of lubricant for a sufficiently long time. The EU-funded LUBGEAR project is addressing this major challenge by researching gear technologies that do not face catastrophic damage even in the event of loss of lubrication. The focus is on material systems that reduce power loss while significantly increasing wear resistance. This should avoid exceeding thermal and mechanical load limits during loss of lubrication. Systematic investigations are also being carried out to identify mechanisms for power loss and the damage behavior of gears operating under loss of lubrication conditions.