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GLAST Large Area Telescope: LAT System Engineering Pat Hascall SLAC System Engineering

Gamma-ray Large Area Space Telescope. GLAST Large Area Telescope: LAT System Engineering Pat Hascall SLAC System Engineering. Topics. Action Item Status Technical Baseline Management Requirements Management and Verification Planning Interface Control Documentation RFA Closure

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GLAST Large Area Telescope: LAT System Engineering Pat Hascall SLAC System Engineering

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  1. Gamma-ray Large Area Space Telescope GLAST Large Area Telescope: LAT System Engineering Pat Hascall SLAC System Engineering

  2. Topics • Action Item Status • Technical Baseline Management • Requirements Management and Verification Planning • Interface Control Documentation • RFA Closure • Key Metrics • Risk Management

  3. Monthly Action Item Status

  4. Drawing Release Status • Drawing preparations at SLAC matched needs for November (still need a few status updates to be sure) • Drawing release did not keep pace • Tracker team put in 30 drawings in November that are still not released • Due in part to vib test results – have broken free drawings unaffected by that test • Have instituted a better tracking system to provide better visibility into where drawings are in the release cycle • Mechanical, Cal and Electrical on track • ACD report is incomplete but progress is apparently 46 drawings behind release plan • Additional drawings identified • Four Tracker drawings • 14 Outline drawings needed by Integration • Intermediate link between subsystem models and LAT model • Three harness drawings

  5. Planned Drawing Release

  6. Issues

  7. Issues (Continued)

  8. Issues (Continued)

  9. Issues (Continued)

  10. Requirements & Performance Verification Progress Test Data Requirements • New direction to add appendix to LAT-MD-00408 for each subsystem defining End item data packages (12/10 F to F) Test Planning • Post CDR LAT-MD-00408 out for signatures • Highlights include: • Changes TKR & CAL to Proto Flight Programs • Updated EMI section • New Assy & Test Flow • Added strength Testing

  11. Updated LAT Performance Verification Plan • Additions • Added section on plan for the test plans • Updated and re-formatted reference documents • Added section on Strength Testing • Deletions • Removed reference to an ESD compatibility test • Removed Appendix-A, example Test procedures • Changes • Updated LAT Assembly and Test Flow • Updated EMI/EMC Section to reflect latest post CDR requirements • Updated document release matrix • Updated section on Test Data Packages • Changed Tracker to a Proto Flight Program • Changed Calorimeter to a Proto Flight Program • Provided details on alignment and Survey • Updated LAT Thermal Vacuum cycle plot (from CDR)

  12. Test Plan Schedules • LAT I&T - Assembly Plan – 12/19/03 • LAT Comprehensive Performance Plan- 6/04 • LAT Limited Performance Plan - 6/04 • LAT Operational Performance Tests - 3/04 • LAT Instrumentation Plan - Update 1/16/04 • LAT Survey Plan – 1/16/04 • LAT Dynamics Test Plan – First Release 12/19/03, Final 3/04 • LAT Thermal Test Plan - First Release 1/16/04, Final 3/04 • LAT EMI/EMC Test Plan - First Release 3/04

  13. Interface Management

  14. LAT-SC Interface – Open Issues

  15. ICN’s • LAT signed this month • ICN-9 Reduce the High Speed Serial Science Data Rate (11-11-03) • ICN-17 LAT Orientation during TVAC Testing (11-11-03) • ICN-25 Add SC RT to 1553 Protocol Document (11-11-03) • ICN-37 Add Digital Grounds to Connector Pin-outs (11-21-03) • ICN-36 LAT-SC Mechanical Interface (11-25-03) • Currently under signature review • ICN-39 PRU Over-Voltage Limit • Currently in draft or revision • ICN-33 LAT Analog RTD Part Type

  16. Interface Documentation Status

  17. Working CDRL Delivery List

  18. RFA Closure • Coordinated plan of attack in place –Horn/Graf/Hascall/Melton • 37 CDR RFAs total, submitted 21 answers, have 5 draft answers • Preparations for MRRs are driving RFA closure priorities • Current status of all RFA’s on SE website

  19. Key Design Metrics

  20. LAT Mass Status

  21. Operational Power November 03 LAT Power Status (Proposed)

  22. Survival Power Changes to power budget Updated Trigger and Data Flow Included design presented during Power Supply Peer Review (removed linear regulators) Incorporated measurements in power supply efficiencies Survival power updated to reflect selected heaters November 03 LAT Power Status (Continued)

  23. FSW Resource Usage Current Estimates

  24. Key Science Performance Metrics

  25. Risk Management

  26. Risk Management Activity • No new issues

  27. Top risks to cost

  28. Top risks to schedule

  29. 3-Month Milestones • Update the LAT-MD-00408 LATPVP – Released for review 12 Dec • Complete FMEA – GSFC picking up task, bottleneck is transfer of work in process • Complete Spacecraft ICD Rev 2 release review – 19 Dec • Close remaining Internal ICD TBX’s - Complete • Update System Metrics – Electrical updated this month, next mass update in Feb • Complete X-LAT Review –Completed • Complete CIDL update – Draft by 19 Dec • Close all open RFAs – October->December->??? • LAT I&T Assembly Sequence – 19 December • Draft Dynamics Plan – 19 December • LAT Survey Plan – 16 Jan 04 • LAT Instrumentation Plan – 16 Jan 04

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