It comprises all the technologies related with aircraft propulsion: performance calculation, aerodynamics of turbomachinery, combustion processes, air-breathing propulsion technologies, heat transfer technologies, engine controls and particular aspects like: nozzles, vectored thrust, reheat and APUs. Fuel and lubricants and
emissions/pollution, test facilities and techniques, engine health monitoring and computational methods for propulsion are also included.

(Source: ACARE Area 3 & PAE own definition)