Auxiliary Power Systems 

Hamilton Sundstrand Auxiliary Power Systems designs and manufactures a variety of products for commercial and military aircraft.  Products include airborne auxiliary power units and ground power units, small expendable and recoverable turbojet propulsion systems, as well as fans and vapor cycle cooling systems. 

Auxiliary Power Units

Auxiliary Power Units (APUs) are gas turbine engines used primarily during aircraft ground operation to provide electricity, compressed air, and/or shaft power for main engine start, air conditioning, electric power and other aircraft systems.  APUs can also provide backup electric power during in-flight operation. 

Expendable Turbojets 

Hamilton Sundstrand Power Systems’ expendable turbojet engines are designed for military applications including tactical missiles, decoys, jammers, aerial targets, and UAVs.  Although simple in design, these engines incorporate advanced turbine technologies that provide reliable high altitude start capability, low fuel burn, compact packaging and state-of-the-art Full Authority Digital Electronic Control (FADEC) engine controllers. 

Fans

Hamilton Sundstrand designs and manufactures a large range of electric-powered and shaft-driven fans that are used in aircraft ventilation and cooling systems, as well as in helicopter engine inlet particle separators. Both fixed (400 Hz) and variable speed, variable frequency fans are available.