1. GLAST LAT Project – Cost and Schedule ReviewNovember 3, 2004 AntiCoincidence Detector 1 GLAST Large Area Telescope: Cost/Schedule Review November 3, 2004 AntiCoincidence Detector (ACD) Subsystem WBS: 4.1.6 David J. Thompson Thomas E. Johnson NASA Goddard Space Flight Center Subsystem Manager/Instrument Manager David.J.Thompson@nasa.gov Thomas.E.Johnson@nasa.gov Gamma-ray Large Area Space Telescope

2. GLAST LAT Project – Cost and Schedule ReviewNovember 3, 2004 AntiCoincidence Detector 2 Significant Accomplishments Started flight PMT assembly. 16 units are completed, 10 are being coated, 20 additional units beginning assembly. Completed vibration testing of the Spare/Qual Electronics Chassis. Installed fiber ribbons on the flight structure. Successfully completed all mechanical qualification testing of the new PMT mounting design. Completed Spare/Qual Electronics Chassis functional testing. Made preparations to go to EMI testing. Received 36 new PMTs from Hamamatsu. Completed the assembly and functional testing of all (4) single row Electronic Chassis (minus the PMTs)

3. GLAST LAT Project – Cost and Schedule ReviewNovember 3, 2004 AntiCoincidence Detector 3 Recent Accomplishments - Electronic Component Status ITEM Quantity Required Flight (Spare) Assembly Complete Functional Testing Conformal Coating Thermal Testing Ready for next assembly Front End Electronics Boards 12 (4) 16 High Voltage Bias Supply24 (6) 30 Photomultiplier Tube Assembly 196 (40) 16100 0

4. GLAST LAT Project – Cost and Schedule ReviewNovember 3, 2004 AntiCoincidence Detector 4 Fabrication, Assembly and Testing status Base Electronics Assembly (BEA) From next page Fiber ribbon detectors (8) Composite Shell Assembly (1) Detector assemblies - TDA - (4 basic types, 89 needed total) Detector Flexures (366+20 spares) ACD Assembly (1) Tile Shell Assembly –TSA (1) STATUS KEY In Fabrication or Ordered Received In assembly Assembled Tested Prototyped Clear fiber cables (130) Number needed in parenthesis 130 6 12 All 89 + spares All 45 1 8 8 360 1 360, All 130 (All) 8 8 8 8 1

5. GLAST LAT Project – Cost and Schedule ReviewNovember 3, 2004 AntiCoincidence Detector 5 Fabrication, Assembly and Testing status Base Electronics Assembly (1) Electronics Chassis (8) (4 double + 4 single) Base Frame Assembly (1) – in and assembled Photomultiplier Tube rails (8 + 2 spares) – All in Power distribution board (8+2 spares) – All in Chassis and connector frames (8) – All in Connectors (32) – All in 1 1 1 1 1 1 1 1 1 1

6. GLAST LAT Project – Cost and Schedule ReviewNovember 3, 2004 AntiCoincidence Detector 6 TSA I&T Fiber Ribbon Installation Complete –Resolved issues with overall length (they were too long) and supporting the ribbons (they sagged) All 25 TOP TDAs INSTALLED and GAPS MEASURED –Data Assessment Showed Some Vertical Gaps Too Large And Some Too Small Large Gaps Affect ACD Performance Small Gaps Could Lead To Tiles Interference During Vibration Environments –Mechanical, Science And Systems Teams Met And Agreed To A Plan For Accepting ‘Predicted’ Final Gaps Reduced Minimum Allowable Gap From.035” To.024” Allowed Largest Gaps at Outer Tile Locations –FINAL GAP PLAN ESTABLISHED FINAL INSTALLATION OF TDAs IS UNDERWAY.

7. GLAST ACD I&TAETD Monthly 11-01-04 7 Initial TDA/TSA I&T in B7 ACD Subsystem Efficiency Verification test (include rotate ACD 90 degree) EMI/EMC Test Pre-ship Review (PSR) Vibration Test Thermal Balance/ Thermal-Vac Test Mass Properties ACD ship to SLAC Pre- Environmental Review (PER) Acoustic Test Post-ship Checkout & Full Functional Test at SLAC Install & test 1 st & 2 nd flight Chassis onto ACD Qual Electronics Chassis Environmental Test 1 st flight chassis Environmental Acceptance Test The remaining Seven Flight Chassis Environmental Acceptance tests 10/4 – 11/3011/25 – 12/712/2 – 1/11 ACD Full Functional Test Install Thermal Blanket & MMS 2/10/05 Assemble last 2 rows of TDAs & WSF (124-130, 224-230, 324-330, 424-430) onto TSA ACD Integration complete 12/29/04 – 1/14/05 1/14/05 – 1/25/05 6/10 – 11/19 12/7 – 12/13 Install & test remaining six flight Chassis onto ACD 12/14 – 1/13 1/14/051/25/05 – 1/27/05 1/27/05 – 2/10/05 2/11/05 – 2/23/052/23/05 – 3/4/05 3/4/05 –3/10/053/10/05 – 4/7/054/7/05 – 4/8/05 4/11/05 4/12/05-4/19/05 (was 3/26/05 – 4/2/05) 4/19/05 – 5/17/05 I&T Flow

8. GLAST LAT Project – Cost and Schedule ReviewNovember 3, 2004 AntiCoincidence Detector 8 Near Term Milestones Milestone Description DateNew DateStatus/Notes Complete PMT Assembly January, 2004 11/05/04First group completed mid-October. See back up material for more information on PMT issue Complete Qualification Unit Electronics Chassis Assembly 5/20/04 10/1/04COMPLETED Complete Flight Mechanical Drawings September 12/1/04One assembly drawings remains. Designer has been focused on problem resolution, revisions, and EOs. Complete installation of 25 top TDAs10/15/04 11/10/04Initial installation and measurement verification complete. Final installation underway. Complete vibration testing of Spare/Qual Electronics Chassis 10/8/04 COMPLETE Complete qualification testing of new PMT mounting design 10/15/04 COMPLETED ON 10/26 EMI Testing of Qual/Flight Spare Electronics Chassis 11/29/04 Continuing to work on defining requirements that can be tested effectively and efficiently. Complete environmental and functional testing of first 10 flight PMTs 11/10/04 PMTs in conformal coating. Complete 34 PMTs for first dual row Electronic Chassis 11/19/04 Thermal vacuum test Qual/Flight Spare Electronic Chassis using fully functional EGSE 12/15/04

9. GLAST LAT Project – Cost and Schedule ReviewNovember 3, 2004 AntiCoincidence Detector 9 Interdependencies 1.EGSE/G3 – Ongoing development with I&T and Electronics groups. –LAT team to arrive at Goddard tomorrow. 2.ICD, IDD, etc – Rich Bielawski is helping track a set of needed changes. –Another IDD (LAT-DS-00309) update has been sent to us for review. It is currently being reviewed by the mechanical team.

10. GLAST LAT Project – Cost and Schedule ReviewNovember 3, 2004 AntiCoincidence Detector 10 Issues, Concerns, Documentation, & Qual Program Issues –PMTs –EGSE/Electronics Chassis testing Concerns –EGSE/Electronics Chassis testing –PMTs –Numerous “minor” technical issues causing schedule and cost concerns. Documentation –Recent “upgrades” to the CM system have caused several issues. This comes at an especially bad time since we have an ISO audit on November 19. –Status of PR/PFRs –88 PR’s Closed –2 PFR’s Closed –10 PR’s Open –6 PFR’s Open (1 black, 3 yellow, 2 red)

11. GLAST LAT Project – Cost and Schedule ReviewNovember 3, 2004 AntiCoincidence Detector 11 ACD Schedule Variances 4.1.6 – ACD Subsystem (-$574K cum, -$176 current) 4.1.6.1 – Management/Science/Systems (-$28K cum, -$10K current) – LOE tasks scheduled incorrectly in PMCS 4.1.6.2 – Safety and Mission Assurance (-$37K cum, -$23K current) – LOE tasks scheduled incorrectly in PMCS 4.1.6.3 - TSA Schedule Variances ($0K cum, $1K current) 4.1.6.4 BEA Schedule Variances (-$239K cum, -$30K current) –All variance is due to the PMTs. 4.1.6.7 ACD I&T (-$243K cum, -$114K current) –Technical issues have delayed progress. PMCS schedule has the ACD in TVAC this month. This will continue to get worse, unless rebaseline or CR action is taken. 4.1.6.B GSE (-$23K cum, $0K current) –($23K) – Shipping container work being pushed out to reduce manpower.

12. GLAST LAT Project – Cost and Schedule ReviewNovember 3, 2004 AntiCoincidence Detector 12 ACD Cost Variances 4.1.6 ACD (-$42K cum, $93K current period) 4.1.6.1 ACD Project Management/Sys Eng/Science (+$213K cum, +$24K current period) –Science support lower than planned. This is one area that has been identified as needing additional support in the form of a Grad student. 4.1.6.2 Safety and Mission Assurance (-$81K cum, -$69K current period) –(-$44K) - Materials support on the PMT anomaly was assessed to 4.1.6.2 instead of 4.1.6.4 4.1.6.3 Tile Shell Assembly (-$122K cum, -$70K current period) –(-$76K) - Design and analysis manpower –(-$46K) - Fabrication charge backs higher than planned

13. GLAST LAT Project – Cost and Schedule ReviewNovember 3, 2004 AntiCoincidence Detector 13 ACD Cost Variances 4.1.6.4 Base Electronics Assembly (-$92K cum, $197K current month) –CCB action corrected majority of cost variance this month –(-$44K) - SLAC ASIC charges. 4.1.6.5 MS/TB (+$35K cum, +$5K current month) 4.1.6.6 ACD Mech Qual and Cal Unit (-$33K cum, -$2K current month) 4.1.6.7 I&T (-$66K cum, -$17K current month) –Have not received credit for the amount of work done. 4.1.6.B Ground Support Equipment (+$104K cum, +$25K current month) –(+$38K) – Labor. Costs lagging on mechanical design and EGSE support. –(+$66K) – Materials. Not billed for work completed

14. GLAST LAT Project – Cost and Schedule ReviewNovember 3, 2004 AntiCoincidence Detector 14 Threats to Schedule and Cost 1.GASU/G3 EGSE 2.PMT Assembly 3.Electronics assembly and test 4.Minor Technical Issues that require manpower and time to resolve.