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Current experience has shown that the oil/air system of a modern fighter aircraft engine determines to a considerable extent the capabilities of the aircraft. To illustrate this point, first of all the specification requirements of such an oil/air system are defined and interpreted. Fullfilment of these requirements necessitates a variety of considerations, of which a few are highlighted in this paper. Taking a three-spool engine as an example, the basic features of the design and functioning of the oil/air system are explained. The importance of the sealing air system and of its reliable computation is demonstrated. Theadvantages and disadvantages of interconnected and separated bearing chambers are pointed out. Attention is drawn to the vent system and to some special conditions of the turbine bearing chamber. Problems of highly loaded bearings are dealt with in some detail in view of a long bearing life, in particular the optimization of the oil supply and the bearing behaviour in the event of an oil supply interruption. Finally, the reasons and consequences of a possible bearing chamber overheating are described as well as means to avoid such overheating. (Puschmann)