GLAST Large Area Telescope LAT Pre-Shipment Review Systems Engineering Pat Hascall

1. Gamma-ray Large Area Space Telescope GLAST Large Area Telescope LAT Pre-Shipment Review Systems Engineering Pat Hascall Systems Engineering Stanford Linear Accelerator Center SE Overview

2. LAT System Engineering Overview • Requirements Baseline Maintenance • Specifications • Interface Control Documentation • Waiver Requests (See Section 10) • Design Baseline Maintenance • Design Documentation Configuration Management • Design Changes Since PER • Requirements Verification Plan (See Section 5) • Traceability to tests, analysis, inspection • Running Sell Process with GSFC Project Office SE Overview

3. Documentation Status • The SE related documentation: see next chart (s) • LAT Specification Current • Traceability to verification complete • Verification Cross Reference Matrix Released • LAT Test Plan Released • Three pending changes to LAT-S/C ICD: See later chart • Several Waivers in Process: See NCRs and Waivers • One pending requirement update in 433-IRD-0001 • I&T documentation status: See I&T presentation • QA documentation status: See QA presentation No significant documentation liens SE Overview

4. Documentation Status (continued) • RFAs from previous reviews • See Systems Engineering Web site for dPDR, PDR, and CDR RFA closures • http://www-glast.slac.stanford.edu/systemengineering/RFAS/RFAS.htm • Two PER RFA’s open • #1: Alignment Verification • Response: Updated response provided • #8: NCR/Waiver Review for Unidentified Current and Residual Risks • Response: LAT project/NASA review and update included in this package SE Overview

5. Key Documentation Mission Level Documents 433-SRD-0001: GLAST Science Requirements Document 433-IRD-0001: GLAST Science Instrument – Spacecraft Interface Requirements Document 433-SPEC-0001: GLAST Mission System Specification 433-OPS-0001: GLAST Operations Concept 433-MAR-0001: Mission Assurance Requirements (MAR) for GLAST LAT 433-RQMT-0005: GLAST EMI Requirements 433-ICD-0001: GLAST LAT-GBM Burst Interface Control Document 1196 EI-Y46311: SC-LAT Interface Control Document 1196 EI-S46310: 1553 Interface Control Document LAT Level Documents LAT-SS-00010: LAT Performance Specification LAT-SS-00778: LAT Environmental Specification LAT-SS-00115: Mechanical Subsystem Specification (in final release cycle) LAT-SS-00715: TCS Performance Specification LAT-SS-00019: Trigger & Dataflow Subsystem Specification LAT-TD-00399   Software Requirements Specification LAT-SS-00016: ACD Subsystem Specification LAT-SS-00017: Tracker Subsystem Specification LAT-SS-00136: Power Subsystem Specification LAT-SS-00018: CAL Subsystem Specification LAT-MD-00446: LAT SVAC Plan LAT-MD-00408: LAT Performance Verification Plan LAT-MD-02730: LAT Performance and Operations Test Plan LAT-MD-07658: LAT Verification Cross Reference Matrix SE Overview

6. SC-LAT ICD Pending Changes • SC-LAT ICD EIY46311-000C is released • The table below lists pending changes SE Overview

7. Overview of Subsystem Changes Since PER • Design Changes Flowed From LAT MRB Process • Changes incorporated in final design documentation • All changes consistent with LAT-SC ICD • Residual Design Liens Against Flight Software discussed in FSW presentation • Mechanical • Minor blanket modifications • Flight Software • Boot code updated SE Overview

8. LAT End Item Data Package • The LAT Project provides an EIDP consisting of the following documents, data, and other materials • LAT-level subsystem-level requirements specifications • Acceptance test data packages for subsystems • Requirements verification plans and test plans • LAT-level test procedures and reports, and links to test execution logs and records • Open nonconformance reports and waivers • Integration and test records • Assembly and Inspection Data Sheets • Integration records: mate/demate, installation logs, material mix records • EGSE and MGSE documentation • All LAT project documentation is maintained in hardcopy and electronic form at SLAC • The EIDP is a subset • EIDP posted on the Pre-Shipment Review Agenda Page: • http://www.slac.stanford.edu/exp/glast/flight/rdm/sasspreship/lat_sasspreship_review.html • EIDP is currently being populated SE Overview

9. Residual Risks SE Overview

10. Residual Risks (Cont) SE Overview

11. Residual Risks (Cont) SE Overview

12. Residual Risks (Cont) SE Overview

13. Residual Risks (Cont) SE Overview

14. LAT Mass Properties SE Overview

15. LAT Power Status Page Number

16. Survival Power LAT Power Status (Continued) SE Overview

17. FSW Resource Usage * Storing multiple copies (4 currently to use available memory) for risk mitigation SE Overview

18. Instrument Bandwidth Resources • LAT communication, bandwidth (BW) in Mbyte/sec * Present performance of event filter for EPU-CPU, still being optimized. Eventually the physics filter will be adjusted/loosened to take advantage of the max average bandwidh EBM: Event-Builder Module EPU: Event-Processing Unit SIU: Spacecraft Interface Unit SE Overview

19. These unit run times start after the LAT was completely integrated and cover through the completion of the CPT after TV Does not include integration testing Does not include unit testing Unit Run Time SE Overview

20. LAT System Engineering Summary • Process for verification closure with GSFC in place • SE Review of LAT Environmental Tests and verification status indicate ready to ship SE Overview