1 JWST Functional Flow Diagrams and Schematic Block Diagrams

2 JWST Operational Phases and System Functional Breakdown Pre-Launch Phase Approval to ship to the Launch Site Final Count Down Start Launch Phase Deployment & Trajectory Correction Phase Cruise & Commissioning Phase Observatory Sep from LV Primary & Secondary Mirror Deployment Normal Science Operations Phase Observatory Commissioned

3 JWST Phases and System Functional Breakdown Pre-Launch Phase Approval to ship to the Launch Site Final Count Down Start Launch Phase Deployment & Trajectory Correction Phase Cruise & Commissioning Phase Observatory Sep from LV Primary & Secondary Mirror Deployment Normal Science Operations Phase Observatory Commissioned Perform Fault Detection and Correction Generate and Distribute Power Maintain Observatory Temperatures Protect Observatory Components from Environments Collect, Process & Store Engineering DataDownlink Engineering DataEvaluate and Trend Engineering Data Plan Engineering ActivitiesUplink CommandsProcess, Store & Distribute Commands Determine Orbit &

4 JWST Phases and System Functional Breakdown Pre-Launch Phase Approval to ship to the Launch Site Final Count Down Start Launch Phase Deployment & Trajectory Correction Phase Cruise & Commissioning Phase Observatory Sep from LV Primary & Secondary Mirror Deployment Normal Science Operations Phase Observatory Commissioned Perform Fault Detection and Correction Manage Observatory Momentum Point the Observatory Generate and Distribute Power Maintain Observatory Temperatures Protect Observatory Components from Environments & Collect, Process & Store Engineering DataDownlink Engineering DataEvaluate and Trend Engineering DataPlan Engineering ActivitiesUplink CommandsProcess, Store & Distribute Commands Determine Orbit Separate from LV Deploy SA and Acquire Sun Null Rates Deploy HGA Deploy Aft & Forward Sunshield Deploy OTE Tower Deploy Sunshield Deploy SMSS Deploy PM Wings Perform MCC1

5 JWST Phases and System Functional Breakdown Pre-Launch Phase Approval to ship to the Launch Site Final Count Down Start Launch Phase Deployment & Trajectory Correction Phase Cruise & Commissioning Phase Observatory Sep from LV Primary & Secondary Mirror Deployment Normal Science Operations Phase Observatory Commissioned Perform Fault Detection and Correction Manage Observatory Momentum Point the Observatory Generate and Distribute Power Maintain Observatory Temperatures Protect Observatory Components from Environments & Collect, Process & Store Engineering DataDownlink Engineering DataEvaluate and Trend Engineering DataPlan Engineering ActivitiesUplink CommandsProcess, Store & Distribute Commands Determine OrbitPerform MCC2 Perform L2 Orbit Insertion OTE WF Alignment and PhasingISIM and SI Initialization and Calibration Acquire Targets Manage Vibration Maintain Fine PointingSmall / Medium Angle Maneuver &

6 JWST Phases and System Functional Breakdown Pre-Launch Phase Approval to ship to the Launch Site Final Count Down Start Launch Phase Deployment & Trajectory Correction Phase Cruise & Commissioning Phase Observatory Sep from LV Primary & Secondary Mirror Deployment Normal Science Operations Phase Observatory Commissioned Perform Fault Detection and Correction Manage Observatory Momentum Slew the Observatory Generate and Distribute Power Maintain Observatory Temperatures Protect Observatory Components from Environments & Collect, Process & Store Engineering DataDownlink Engineering DataEvaluate and Trend Engineering DataPlan Engineering ActivitiesUplink CommandsProcess, Store & Distribute Commands Determine OrbitPerform Orbit Maintenance Perform WFSC Plan Science Operations Perform Science Observations Perform SI Calibrations Uplink Observation Plan Process / Store Science Data Downlink Science Data Ground Process Science Data Generate Observation Plan Cmds & Acquire Targets Manage Vibration Maintain Fine PointingSmall / Medium Angle Maneuver &

7 JPL Deep Space Network (DSN) JWST Communications System Architecture GSFC Flight Dynamics Facility (FDF) STScI Science & Operations Center (S&OC) Flight Operations Subsystem (FOS) Data Management Subsystem (DMS) Wavefront Sensing & Control Exec (WFSC Exec) Proposal Planning Subsystem (PPS) Operations Script Subsystem (OSS) Project Reference DB Subsystem (PRDS) Observatory Simulators (OTB/STS) Madrid NASA Integrated Services Network (NISN) L2 Point Launch Segment Observatory Segment L2 Transfer Trajectory Ground Segment GoldstoneCanberra L2 Lissajous Orbit The launch vehicle injects observatory into an L2 transfer trajectory The observatory operates at L2 point for 5 years with a goal of 10 years, providing imagery and spectroscopy in the Near and Mid Infrared wavebands. The Ground Segment receives downloads of science data and sends command uploads during daily 4 hour contacts Ground Segment uploads plans to the Observatory ~once a week and the observatory autonomously executes these plans NASA Provided Communication Asset for Early Orbit Phase

8 Observatory Schematic Block Diagram

9 JWST Phases and System Functional Breakdown Pre-Launch Phase Approval to ship to the Launch Site Final Count Down Start Launch Phase Deployment & Trajectory Correction Phase Cruise & Commissioning Phase Observatory Sep from LV Primary & Secondary Mirror Deployment Normal Science Operations Phase Observatory Commissioned Perform Fault Detection and Correction Manage Observatory Momentum Point the Observatory Generate and Distribute Power Maintain Observatory Temperatures Protect Observatory Components from Environments And Collect, Process & Store Engineering DataDownlink Engineering DataEvaluate and Trend Engineering DataPlan Engineering ActivitiesUplink CommandsProcess, Store & Distribute CommandsDetermine OrbitPerform Orbit Maintenance