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3. ORBITER STRUCTURE ................. 3-1 4 ORBITER SYSTEMS 4. ORBITER SYSTEMS Avionics AVIONICS 50В5Ү5ТЕМ5................... 4-41 Guidance, Navigation, and Control The avionics equipment compartments. An aft hatch in the Vertical Processing Facility. 6-23 ORBITER PROCESSING FACILITY Figure 6-8.—Launch Pad 39-A.