Figure
3-1	Elevon failure effects
3-2	Four-port actuator
3-3	Baseline system approach
3-4	Active/standby approach
3-5	Parallel string approach
3-6	System management approaches
3-7	Skewed IMU approach
4-1	Avionics equipment locations
4-2	Avionics functional categories
4-3	Ascent control effectors.
4-4	Ascent trajectory.
4-5	Entry trajectory.
4-6	Terminal area energy management
4-7	Final approach
4-8	Listen mode
4-9	Memory configurations.
4-10	OPS substructure
4-11	Software architecture
4-12	GPC memory configuration
4-13	Data bus characteristics.
4-14	Data bus message formats.
4-15	Data bus architecture
4-16	Multiplexer/demultiplexer block diagram
4-17	Master events controller.
4-18	Engine interface unit
4-19	Annunciator display unit.
4-20	Data bus control.
4-21	Forward flight deck.
4-22	Aft flight deck.
4-23	Display and control block diagram.
4-24	GN&C RM configuration.
4-25	Air data system.
4-26	GN&C actuator configuration.
4-27	Typical hydraulic actuator drive.
4-28	Main engine throttle control.
4-29	RCS configuration.
4-30	OMS configuration.
4-31	Sequencing configuration.
4-32	Instrumentation system
4-33	System management configuration.
4-34	Orbital communication links.
4-35	Atmospheric flight links
4-36	Hardware groupings.
4-37	Antenna locations.
4-38	S-band network equipment.
4-39	S-band network services.
4-40	S-band payload communications.
4-41	Ku-band radar/communication subsystem.
4-42	Audio distribution system.
4-43	Navigation aids.
4-44	Payload interfaces.
4-45	Electrical power system (single string).
4-46	Essential bus distribution (one of three).
4-47	Control buses.
4-48	Checkout configuration.