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Manages the reaction control and orbital maneuvering thrusters during all phases of flight; monitors fuel usage and storage tank status; calculates optimal sequences for thruster firings.

Monitors main engine and solid rocket booster performance during ascent phase.

Responsible for all inertial navigational systems hardware such as star trackers, radar altimeters and the inertial measurement units; monitors radio navigation and digital autopilot hardware systems.

Coordinates operation of ground stations and other elements of worldwide space tracking and data network; responsible for MCC computer support and displays.

Formerly known as RMU; responsible for remote manipulator system; monitors auxilliary power units and hydraulic systems; manages payload bay and vent door operations.

Monitors onboard navigation of the Orbiter during rendezvous operations and advises the control team on the rendezvous profile. Should a contingency revisit to HST become necessary on this flight, the Rendezvous position would be activated.

Monitors health of flight crew; provides procedures and guidance on all health-related matters.

Provides real-time explanation of mission events during all phases of flight.