duction, there have been just over 470 800XPs built. Page 22 EFTA00605255 Afibviist Aadet 7/tanagesient Vac Honeywell TFE-731 INTRODUCTION The TFE731 was based on the core of the TSCP700, which was specifically developed for use as the auxiliary power unit (APU) on the McDonnell Douglas DC-10. The