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Orbiter auxiliary power unit system. 4-16 4. ORBITER SYSTEMS Avionics AVIONICS 50В5Ү5ТЕМ5................... 4-41 Guidance, Navigation, and Control ........... 4-41 Navigation Аїа5 ........................... 4-41 Communications .......................... 4-41 Displays and Сопіго!ѕ...................... 4-41 Multifunction Display System The housekeeping system is used to view a mass spectrometer, samples the environment during loading.