GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering1 GLAST Large Area Telescope: LAT System Engineering WBS Dick Horn SLAC System Engineering Manager Gamma-ray Large Area Space Telescope

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering2 Topics LAT System Engineering Overview D. Horn –Design Review Summary –Key System Performance Metrics –Configuration Management And Technical Baseline –Risk Management Requirements, Traceability & Interfaces System FMEA/PRA/Reliability T. Thurston System VerificationT. Leisgang Cost & Schedule SummaryD. Horn

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering3 LAT System Engineering Overview Section 7-1 Gamma-ray Large Area Space Telescope

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering4 WBS System Engineering LAT System Engineering D. Horn System Integration & Audits D. Lung/T. Thurston Interface Develop. & Verif. R. Bielawski Test Planning & Verif. T. Leisgang/S. Sawyer Configuration Mgmt N. Cramar Requirements Mgmt W. Davis FMEA/FTA/PRA Risk Management Ground System Interfaces System Reviews Internal ICD’s Spacecraft ICD Interface Verification LAT System Verification Plan Performance Test Planning Test Procedure Audits Test Discrepancy Resolution Document Control & Release Requirements Management Configuration Item Data List System Metrics

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering5 Design Maturity Summary Fiscal Years Begin LAT I&T Critical Design Review PDR PER PreShip Review LAT Ready For S/C I&T FABRICATION PHASECOMMISSIONING PHASE Build & Test Flight Units Observatory I&T Final Design Engr’g Models LAT I&T Ops. Prelim. & Sys. Design PDR Delta Baseline Review Subsystem CDR Peer Reviews SRR Mature & Stable Requirements Since SRR Key Interfaces With Spacecraft Established and Reflected in CDR Design

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering6 PDR &  PDR, Peer Review RFA Closure PDR RFA’s Submitted, 43 of 57 Closed –Key residual issues: Calorimeter to grid attachment Closure of Tracker Engineering Model Results EMI/EMC box level acceptance test dPDR RFA’s Submitted, 17 of 20 Closed –No design drivers identified –LAT Initial responses under review by GSFC Subsystem CDR Peer Review RFA’s SubsystemClosed/Total ACD17/19 Calorimeter12/30 Electronics/FSW23/26 Tracker17/39 Mechanical19/48 I & T17/21 Current Status of all RFA’s Available at LAT System Engineering Website Subsystem talks will address key open RFA’s

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering7 LAT Mass Status

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering8 LAT Power Status Subsystem allocations have been reduced to CDR estimates to ensure LAT system CCB action for future power growth LAT-TD

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering9 FSW Resource Usage Current Estimates LAT-TD ResourceTotal AvailableAnticipated Usage Margin Factor EPU Boot PROM256 kB128 kB2 SIU Boot PROM256 kB128 kB2 EPU EEPROM4 MB1.5 MB2.7 SIU EEPROM8 MB MB3-5 EPU CPU cycles200% in 2 EPUs30%> 6 SIU CPU cycles100% in 1 SIU25%4 EPU memory128 MB16-32 MB4-8 SIU memory128 MB< 16 MB8 Bandwidth – instrument to EBM45 MB/sec10 MB/sec4.5 Bandwidth – EBM to CPU20 MB/sec5 MB/sec4 Bandwidth – CPU to EBM2.5 MB/sec20 kB/sec125 Bandwidth – EBM to SSR5 MB/sec40 kB/sec125

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering10 Key Science Performance Metrics

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering11 Management Plans

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering12 Configuration Management LAT CM Defined By LAT MD Major Supplier CM defined internally Key Subsystem Doc CM Transferred to LAT CM upon Subsystem Delivery to LAT Change Control Process In Place LAT CM Elements LAT CM Change Control Process

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering13 Change Control Thresholds

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering14 Risk Management LAT Risk Management Defined By LAT-MD Parallel Process To GSFC …. Continuous Process Across LAT Risk Ranked By Probability and Impact to Technical, Cost & Schedule Low Risk (Selected Mitigation) Moderate Risk (Selected Mitigation) High Risk (Mitigation Required) Risk Ranking Impact

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering15 Top System Risks ID #Risk Rank Risk DescriptionRisk MitigationStatus CAL- 004 High Delay in deliveries of flight CDEs Our French collaborators are in the middle of a competitive procurement for the industrial partner that will fabricate all flight CDEs. The procurement process must follow French law and is potentially subject to the delay of administrative reviews The selected industrial partner must design and fabricate appropriate tooling, develop controlled manufacturing process, fabricate and qualify CDE prototypes, and then fabricate 108 CDE for the CAL Qual model by mid Sept, 2003 A higher CDE manufacturing rate is an option to the French contract but may present financial and technical risks. The higher rate would deliver the later modules on schedule. Current top program issue Proj Mgt Moderate Inadvertent use of non-flight qualified processes, parts or materials; results in cost/schedule impact. EEE Parts Plan In-place. Material Review Board. Preproduction readiness reviews Processes in place Proj Mgt Moderate ASIC’s fail to meet requirements; results in schedule impact Focused review & test. Margin for re- runs protected where possible Individual risks Identified by subsystem Processes in place

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering16 Top System Risks (continued) ID #Risk Rank Risk DescriptionRisk MitigationStatus SE Moderate Inadequate End to End LAT test simulation leads to undetected H/W or S/W problem until at observatory test or on orbit Key early performance & integration interface testing through engineering model test bed Early integration of Spacecraft Simulator into development and I&T Audit test opportunities and value (Airplane test, T/C Tests) Evaluation of planned functional & performance tests to identify residual risks (6/17/03) Finalizing details of S/C Simulator (TBD) SE Moderate Critical component failure post LAT integration requiring de- integration impacting cost & schedule Extensive use of EM test bed to support flight H/W & S/W development Thorough qualification and acceptance tests Pre planned I&T actions for de- integration Completed evaluation for improving access (9/02) Qual & acceptance planning in-place I&T developing contingency plans

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering17 System Requirements, Traceability & Interfaces Section 7-2 Gamma-ray Large Area Space Telescope

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering18 Specification Tree

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering19 Requirements Development Level 2 Reqts Peer Reviews (Aug. 2000) Level 2 Reqts placed under LAT CM LAT System Requirements Review (Sep. 2000) Level 3 Reqts Peer Reviews (Mar.-Apr. 2001) Level 3 Reqts placed under LAT CM Level 4 Reqts developed by subsystems Preliminary Design Reviews (Jan. & Jul. 2002) Level 4 Reqts placed under subsystem CM Line-by-line reviews of LAT and IOC Performance Specs by Subsystem Mgrs, Engineering and Science Leads Updates require approval of LAT change control board Top-level subsystem performance requirements were reviewed by Subsystem Mgrs and LAT Engineering and Science Leads Updates require approval of LAT change control board Subsystem design specifications are controlled at the subsystem level. Level 4 requirements are managed and tracked at subsystem level. CCB changes, document updates and test planning Critical Design Review (May 12-16, 2003) Reqts. docs imported and linked in DOORS Reqts. in DOORS linked to planned tests and analyses. Impacts from changes are flowed up or down as they are identified. Resulting Level 3 traceability to verification plans is documented in LAT-TD Resulting Level 3 traceability to verification plans is documented in LAT-TD

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering20 Key Requirements Flow

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering21 Key Level 2 Requirements

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering22 Requirements Traceability and Verification Example of Flowdown from Science Requirements

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering23 Requirements Traceability and Verification Effective Area Requirement Flowdown Example from LAT-TD , LAT Requirements Tracking Report

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering24 Requirements Traceability and Verification Future Work –Near term Incorporate all CCB-approved Level 2 and 3 changes in requirements document revisions (ECD 6/30/2003) –Long term Complete compliance verification table for level 2 and 3 requirements –Link requirements to test procedures (ECD June 2004) –Link compliance to test data packages & analysis reports (On-going as tests & analyses are completed. ECD June 2005)

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering25 Key LAT Interface Overview Anticoincidence Detector (ACD) StructuralGrid bolted joint, shear pins ThermalConductive bolted joint; Radiative coupling w/ TKR Electrical3.3V, 28V; Data, Temp sensors, S/W I&TLift fixture, Electrical test stand Electronics StructuralStand-off to CAL; Bolted stack; Cabling ThermalThermal joint to X-LAT Plate Electrical27-29V Regulated, Data, S/W I&TTest bed TCS/X-LAT Plate/Radiators StructuralBolted/pinned joints ThermalHeat pipes, Heaters Electrical27-29V Regulated, 25-35V Unregulated; Temp sensors, S/W I&TRadiator handling fixture, Radiator lift fixture, X LAT Plate lift fixture, Electrical test stand Calorimeter (CAL) StructuralGrid pinned/bolted joint ThermalConductive bolted joint Electrical3.3V, 3.3VDig,100V Bias; Data, Temp sensors, S/W I&TAlignment Tool, Lift fixture, Electrical test stand Tracker (TKR) StructuralGrid Ti flexure mount ThermalConductive Cu strap Electrical1.5V, 2.5V, 2.5VDig, 150V Bias; Data, Temp sensors, S/W I&TLift fixture, Electrical test stand Spacecraft StructuralFour-point mount to SC flexures, Two-point pinned struts for each radiator ThermalIsolated (SC Mount, Radiator struts); Radiative (S/A) Electrical27-29V Regulated, 25-35V Unregulated, MIL-STD-1553B, Analog and digital sensors, LVDS, EMI/EMC, High speed serial science data I&TGrid perimeter ring, Radiator handling fixture, Radiator lift fixture, Purge, LAT test point GBM StructuralCabling ThermalNone ElectricalLVDS, 1553 Telecommands I&TNone

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering26 Structural/Thermal Interface Overview

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering27 Spacecraft-LAT Electrical Interface 4 Discrete Monitors Command & Telemetry Science Data 8 Discrete Controls 4 Temperatures, 8 Voltages DAQ Timing Note: Redundancy not shown SC PRU 28V ± 1V 6 Temperatures, 12 Voltages GBM SIU VCHP Burst Trigger EGSE Grid and Antifreeze Survival Heaters 4 Voltages 32 Temperatures 22 Temperatures 4 Voltages LAT SIU LPDU +X +Y SC C&DH SC PDU 25V – 35V LVDS 1553 Power Signal

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering28 Internal LAT Electrical Interfaces

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering29 Key TKR-LAT Interface Requirements* A=Analysis, D=Demonstration, I=Inspection, T=Test * TKR-LAT Mechanical and Thermal ICD, LAT-SS and TKR-LAT Electrical ICD, LAT-SS-00176

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering30 Key CAL-LAT Interface Requirements* A=Analysis, D=Demonstration, I=Inspection, T=Test * CAL-LAT Mechanical, Thermal and Electrical ICD, LAT-SS-00238

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering31 Key ACD-LAT Interface Requirements* A=Analysis, D=Demonstration, I=Inspection, T=Test * ACD-LAT Mechanical, Thermal and Electrical ICD, LAT-SS-00363

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering32 Key Electronics-LAT Interface Requirements* A=Analysis, D=Demonstration, I=Inspection, T=Test * Electronics-LAT Mechanical and Thermal ICD, LAT-SS-01794

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering33 Key Open Internal LAT Interface Issues

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering34 Internal LAT Interface Compliance Issues A=Analysis, D=Demonstration, I=Inspection, T=Test

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering35 Key LAT-SC Interface Requirements 1/3 Requirement is being developed A=Analysis, D=Demonstration, I=Inspection, T=Test

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering36 Key LAT-SC Interface Requirements 2/3 A=Analysis, D=Demonstration, I=Inspection, T=Test

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering37 Key LAT-SC Interface Requirements 3/3 A=Analysis, D=Demonstration, I=Inspection, T=Test

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering38 Key Open External LAT Interface Issues* * Face-to-face technical interchange meeting is scheduled for May 21 & 22 to discuss remaining interface issues.

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering39 Interface Documentation Status

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering40 Summary Weekly Telecons and Frequent Splinter Meetings have resulted in: –LAT-SC ICD released –LAT-SC 1553 ICD released –TKR, CAL and ACD ICD’s released and contain 0 TBX’s –Electronics ICD w/ 5 TBX’s in review –Interface Definition Drawings released or near release Complete Implementation of LAT-GBM ICD All key open interface issues to be resolved by August 2003

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering41 System Engineering LAT FMEA/PRA/Reliability Section 7-3 Tim Thurston SLAC Gamma-ray Large Area Space Telescope

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering42 System FMEA/PRA/Reliability Instrument Reliability Target: R LAT .85 for 5 year Mission Life Instrument Element Reliability Targets (Established 05/2001) R CAL .96 R TKR .96 R ACD .96 R T&DF .96 R TML/STRU .99 R TKR R CAL R ACD R T&DF R TML/STRU

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering43 System FMEA/PRA/Reliability LAT Instrument Reliability Block Diagram TEMTEM-PSCALTEMTEM-PSTKR AEM BEATDA MMS/MLI GASU SIU EPU PDU STRUTML 15 of of 1294 of 96 Standby R LAT =.882 R CAL =.9776R TKR =.9668 R ACD =.9568R T&DF =.9884 R TKR = of 2 2 of 3

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering44 System FMEA/PRA/Reliability Reliability Calculations Assumptions/Methodology –Both Mil-HDBK-217F and vendor provided data are being used for the of failure rates estimates. –LAT level reliability analysis extracted some component reliability numbers from element level reliability reports. Because of slightly different view of reliability relationships and partitioning, LAT level results vary slightly from reliability stated in element reliability reports. –All reliability numbers normalized to 30 °C ambient using Mil-HDBK-217F derating factors. The conservative factor is 1.5x improvement per 10 ° C reduction. –Massively redundant detections components, CAL and TKR, allowed to degrade up to 10%, ACD detection components allowed to degrade 2 of 96, Tower modules allowed to degrade to 15 of 16, and ACD BEA allowed to degrade to 11 of 12. All degradations expected to be within science performance margins. –Some passive elements such as resistors and wires are not included in the model. Failure rates for these elements are considered extremely low.

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering45 System FMEA/PRA/Reliability CAL Module Reliability Block Diagram CAL Power FeedCAL Signal FeedCAL AFEE R CAL(x) = CAL Power FeedCAL Signal FeedCAL AFEE CAL Detector Element CAL Power FeedCAL Signal FeedCAL AFEE CAL Power FeedCAL Signal FeedCAL AFEE CAL Power FeedCAL Signal FeedCAL AFEE CAL Power FeedCAL Signal FeedCAL AFEE CAL Power FeedCAL Signal FeedCAL AFEE CAL Power FeedCAL Signal FeedCAL AFEE CAL Detector Element 43 of 48

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering46 FTA’s completed on EPU’s, ACD, CAL, TKR, STR, TML, GASU’s, PDU’s, SIU’s, TEM’s, & TEM/PS’s ~160 fault elements/components MMS & MLI are the only single point failures identified. Probability of failure is not realistic No other single point failures without ground contingency – (Software) Most components multiple redundant Fault Tree Analysis – LAT-TD Failure Mode & Effects Analysis - LAT-TD ~ 800 failure modes identified No severity category 1 failure modes One element to watch w/severity category 2 failure mode Four elements to watch w/ failure mode severity category of 2R, Two elements to watch w/ severity category of 2MR System FMEA/PRA/Reliability

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering47 System FMEA/PRA/Reliability Likelihood estimates made for all fault sequences with failure mode categorization of 1, 2, 2R, 2MR PRA watch list provided with fault sequences prioritized from most likely to least likely. PRA watch graphically summarized in a 5x5 risk matrix. Probablistic Risk Assessment – LAT-TD (Draft) Limited Life Item Analysis - LAT-MD No limited life items identified within the 5-year design life

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering48 System FMEA/PRA/Reliability Probabilistic Risk Assessment/FMECA Summary

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering49 System FMEA/PRA/Reliability Probabilistic Risk Assessment – Element Watch List

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering50 System FMEA/PRA/Reliability Probabilistic Risk Assessment – Component Watch List (1 of 2)

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering51 System FMEA/PRA/Reliability Probabilistic Risk Assessment – Component Watch List (2 of 2)

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering52 System Engineering Test Verification Planning Section 7-4 Tom Leisgang LAT Systems Engineering Test & Verification Gamma-ray Large Area Space Telescope

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering53 Requirements Verification Process A tested and certified instrument

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering54 LAT Test Plan Organization

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering55 LAT Performance Verification

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering56 LAT End to End System Verification LAT System Verification –Front Subsystem –T&DF In Test Bed –Integrated I&T –System Throughput in Test Bed Uses event simulators Man-made events Science Verifications –Engineering Models –Qualification Units –Calibration Units –Integrated LAT Final Verification –By correlated analysis Risk –Event orbital rates/distribution—not checked

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering57 LAT Science Verification

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering58 Subsystem Qualification Programs

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering59 Subsystem Acceptance Test Program

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering60 Performance Verification: Thermal

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering61 Performance Verification: Mechanical

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering62 Performance Verification: Electronics

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering63 Performance Verification: Flight Software

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering64 LAT Verification Summary All LAT subsystems and LAT Instrument have complete requirements verification All MAR test requirements are performed and verified All Science Requirements are verified Systems Engineering has a “closed loop” requirements verification process in place

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering65 Cost/Schedule Summary Section 7-5 Gamma-ray Large Area Space Telescope

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering66 CCB Actions Affecting Change Request #DescriptionStatus LAT-XR Systems Engineering Manpower Approved $1.8M LAT-XR SLAC/HEPL Labor Escalation Rates Approved -$16K

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering67 Budget, Cost, Performance

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering68 Cost/Schedule Status ItemIn k$ Budget at Complete6,453 Budgeted Cost for Work Scheduled (a)3,049 (a) Budgeted Cost for Work Performed (b)3,049 (b) Actual Cost for Work Performed3,029 Cost Variance 200.7% of (b) Schedule Variance 00% of (a) Status as of March 31, 2003:

GLAST LAT ProjectCDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967Section 7 Systems Engineering69 Summary Independent Technical Peer Reviews have been completed –Open issues identified –Closure plans in work (see Subsystem detailed talks) Configuration Management Processes in place Key metrics established Continuous Risk Management process in place LAT System Interfaces are established and under CCB Control LAT FMEA and Fault Tree Analyses baselined Verification planning and oversight in place