ENGINE BEARINGS Two types of bearings are used in this engine: - roller bearings keep the shafts in the correct radial position- location thrust ball bearings for all three shafts are positioned in the internal gearbox. The LP and IP rotor assemblies are each supported by three bearings. The HP rotor is supported by two bearings. There are 4 bearing chambers: - the front bearing chamber includes the LP and the IP roller bearings - internal gearbox bearing chamber includes the LP, IP and HP location bearings- HP/IP turbine bearing chamber includes the HP and IP turbine roller bearings - LP turbine bearing chamber includes the LP turbine roller bearing and the LP turbine spring pack bearing. Bearing chambers are sealed using IP and HP air and are isolated from other engine parts by labyrinth seals.