GLAST Large Area Telescope: I & T Input to LAT Planning Meeting July 17 th and 18 th

1. Gamma-ray Large Area Space Telescope GLAST Large Area Telescope: I & T Input to LAT Planning Meeting July 17th and 18th Elliott Bloom SU-SLAC Subsystem Manager Brian Grist SU-SLAC Subsystem Engineer elliott@slac.stanford.edu, bgrist@slac.stanford.edu 650-926-2469 650-926-2998

2. Key Milestone List to Delivery (Not Necessarily in Current PMCS) EM Plan, Procedures, EGSE and MGSE Complete 07/31/03 Receive CAL EM 08/08/03 Receive TKR mini-tower 08/22/03 EM Tower functional tests Complete 09/18/03 EM Tower Available for use by Flight Software 09/18/03 EM Calibration Complete 10/12/03 EM mechanical fit check using 1X4 Grid, TKR Mech tower, CAL 10/13/03 CAL EM at NRL Loading Doc; TKR mini-tower in Italian Customs 10/17/03 Support GSI Beam Test (CAL and TKR mini-tower) 11/14/03 All I&T Flight Techs on Staff (Mechanical and Electrical) 12/15/03 Flight Integration Training MGSE Ready 01/15/04 All Flight Integration Procedures Complete 02/15/04 All Flight Integration MGSE Complete with SDP 03/01/04 LAT Assembly Configuration EGSE Ready For Use 03/01/04 Integration Readiness Review 03/15/04 TKR A/B Available RFI 04/15/04 Grid Available RFI 05/20/04 CAL A/B Available RFI 05/20/04

3. Multi-Tower EGSE (9/15/03) T&DF System (LAT) EGSE ACD or Sensor Simulator EGSE Crate CPU LCB WAN GASU 28 V Supply Central Database EBM VME AEM GEM Online Workstation TEMs Firewall CAL, TKR or Sensor Simulator SLAC

4. Single Tower EGSE Configuration (GSI test) Electronics/Online • Online • Workstation • Test Exec • Configuration • Commanding • Telemetry • Event Processing • Monitoring • Visualization • Data base • Message logger • Alerts • Electronic log Subsystem/simulator Back door debug RS-232 Subsystem (or simulator) Central Database VME Chassis • CPU • Commanding • Telemetry • Monitoring • Hardware Drivers AEM/TEM WAN Ethernet Main Dataflow Ethernet • LAT-COMM • External Trigger Ethernet Router and Firewall DC Power External Hardware

5. Key Milestone List to Delivery After Start of Flight I&T (Not in Current PMCS) Start Tower A/B Installation/Test 05/20/04 Start Tower 1/2 Installation/Test 07/01/04 Start Tower 13/14 Installation/Test 10/28/04 Finish Tower Installation/Test 11/11/04 Finish Installation of ACD/ELEX/X-LAT 12/23/04 Flight Configuration Ready for System Test 12/23/04 Complete System Test 04/21/05 LAT Shipped for Environmental Testing 07/21/05 Environmental Testing Complete 11/03/05 LAT RFI 12/01/05

6. 28 V Supply LAT Assembly Configuration (3/1/04) LAT EGSE Spacecraft simulator ACD or Sensor Simulator SIU CPU Discretes 1553 1553 WAN LCB GASU Central Database EBM AEM SSR 3 EPUs GEM CPU Online Workstation LCB TEMs Firewall EGSE Crate Test Point on LAT EMI Skirt CAL, TKR or Sensor Simulator CPU LCB SLAC

7. Spacecraft simulator Discretes 1553 28 V Supply SSR Complete Flight Unit Configuration & CU (12/24/04) LAT EGSE ACD SIU CPU 1553 WAN LCB GASU Central Database EBM AEM 3 EPUs GEM CPU Online Workstation LCB TEMs Firewall EGSE Crate Test Point on LAT EMI Skirt CAL, TKR CPU LCB SLAC

8. Interdependencies • Dependent on deliveries from all subsystems to be able to do the core of our work. • EM CAL & TKR mini-tower deliveries. • EM GASU and flight software support from ELX. • All Flight Hardware and Software. • MGSE FEM Analysis • Budget for I&T Flight Electronic Techs and the hiring of those techs (4 full time people starting 12/15/03) is currently the responsibility of ELX. I&T will schedule the work for these Techs. • System engineering test plans are required as input to I&T test plans and resulting procedures. • Mission level EGSE decisions can impact I&T EGSE schedule and budget.

9. Flight Hardware Procurements • No flight hardware procured by I&T. All flight components come from a subsystem.

10. Flight Hardware Manufacturing Plan Status • LAT-MD-01376 LAT Integration & Test Plan In Work • LAT-MD-01137 LAT EM Test Plan In signoff • LAT-MD-01533 EGSE Plan In revision • LAT-MD-00446 SVAC Plan Released • LAT-MD-01587 SVAC Test Plan Released • LAT-MD-01598 LAT Weight and CG Test Plan Released • LAT-MD-01462 MGSE Development Plan In signoff • LAT-MD-01836 LAT Dynamics Test Performance Plan Draft in Cyberdocs • LAT-MD-01837 LAT Thermal Test Performance Plan Draft in Cyberdocs • LAT-MD-01838 LAT EMI Test Performance Plan Draft in Cyberdocs • LAT-MD-00676 LAT Assembly Sequence In revision • LAT-MD-01386 LAT Facilities Plan Released • LAT-MD-01586 LAT Survey & Alignment Performance Plan In signoff • LAT-MD-01055 LAT Electrical Test Performance plan Released • LAT-MD-00440 LAT Particle Test Plan In signoff

11. Engineering Model Testing Closure Status • I&T Tests of the TKR mini-tower were done and the results reported to the Engineering meeting at June 10 Engineering Meeting. Data is still being worked. • EM tower (CAL EM and TKR mini-tower) due in August to I&T • Complete EM Tower functional test by September 18th and then make available to Flight Software. • Complete EM Calibration by October 12th. • Need 1x4 Grid and TRK EM Mechanical tower a week before Mechanical fit check to assemble TRK EM into grid. • Perform a mechanical fit check using 1x4 Grid, TKR Mechanical Tower, and EM CAL on October 13th. • CAL EM on the NRL loading dock and the TKR mini-tower in Italian Customs by October 17th. • Support the GSI Beam Test, including the CAL and the TKR mini-tower(run Carbon in the daytime) November 14th – 24th.

12. Open Flight Design Issues/ Status Trades • CAL-Grid interface design, impacts I&T MGSE, assembly, processes, and procedures. Design not completed. • Grid EMI Skirt design impacts I&T assembly, processes and procedures. Design not completed. • X-LAT plate design impacts I&T MGSE, assembly, processes and procedures. Design not completed. • Radiator interface and MGSE design impact I&T, assembly, processes and procedures. Design not completed. • Environmental test sensor requirements impact I&T assembly, processes and procedures. Requirements have not been finalized. • LAT pointing knowledge requirements are under review by the project. I&T test plans cannot be finalized until we know the final requirements.

13. -2% variance -5% variance Cost/Schedule Status (May Month End) Cost Variance – GREEN Schedule Variance – YELLOW Beam test change request has been approved and has been incorporated for the June Report. The monthly Cost and Schedule Variances are trending negative

14. Issues/Concerns/Suggestions/Risks • Late delivery to I&T of EM parts and EGSE software test scripts. • Late delivery has delayed preparations for LAT, particularly in areas of IFCT and SVAC. Possible impact on EGSE. • Part of EGSE/MGSE verification strategy depends on I&T EM program. • Finalization of all LAT test plan requirements is not complete post CDR. This is resulting in compressed schedule and potential increased cost for I&T. Current estimates are September for completing all test plans from the Design Team. • Delivery of flight hardware to I&T may be late. • I&T EGSE is proceeding with in-house developed test executive software. Change to another system for Observatory and/or IOC will require major cost change request. • Spacecraft interface detail uncertainty. • Environmental test fixtures. • EGSE interface. • MGSE handling fixtures. • SIIS fidelity uncertainty. • Delivery of flight hardware to I&T may be late. • When will a decision be made about where to go for Environmental Testing? This will impact preparations and design of Vib and T/V fixtures.