System Design Considerations for an APU Starter-Generator

This paper examines the utility of an auxiliary power unit (APU) starter-generator system consisting of the 400 Hz APU generator and a start converter. The reliability of the APU start system indicates improvement because of mechanical simplification and coordination of the APU acceleration and the APU engine controller, but results are difficult to quantify. Interface with the electrical power generating system (EPGS) is required since the APU generator is a shared LRU.