1. GLAST LAT ProjectLAT Mgr’s Meeting October 13, 2004 1 LAT Planning Meeting Mechanical/Thermal Systems October 2004 Marc Campell

2. GLAST LAT ProjectLAT Mgr’s Meeting October 13, 2004 2 Cost & Schedule Drivers Major work to go in MECH Completion of Radiator fab, assembly & test Completion of X-LAT fab, assembly & test Completion of Grid #2 Static Load Test Completion of TCS fab, assembly & test

3. GLAST LAT ProjectLAT Mgr’s Meeting October 13, 2004 3 LM Impacts Radiators are ~ 3 months behind schedule X-LAT plate is ~ 5 months behind schedule Formal ETC from LM is in progress. This data has not been submitted by LM.

4. GLAST LAT ProjectLAT Mgr’s Meeting October 13, 2004 4 LM Risks Radiator –First time use of bonding/assembly tool & procedures (No full sized Dev hardware). MFG marching army costs –Radiator Assembly design doesn’t accommodate repairs –Handling risks – large, fragile hardware –Cost over runs in testing Fixture design (Acoustic) Facility scheduling – competing with other LM priority programs Resolution of TCS anomalies during Thermal Balance testing. Test marching army costs –Satisfactory replacement of key personnel –Timely headcount roll-off

5. GLAST LAT ProjectLAT Mgr’s Meeting October 13, 2004 5 LM De-scope Options Radiator Vibe testing –Current plan 5-150 Hz low level sine sweep in 3 axes 5-50 Hz sine sweep in 2 axes 5-150 Hz low level sine sweep in 3 axes Acoustic test 5-150 Hz low level sine sweep in 3 axes (plan to substitute - 6 dB acoustic run for this)

6. GLAST LAT ProjectLAT Mgr’s Meeting October 13, 2004 6 LM De-scope Options (cont) Radiator Vibe testing - De-scope options –Defer 5-150 Hz sine sweep until LAT level Perform twang and/or tap test of Radiator for model validation (first modes only) –Delete 5-150 Hz sine sweep for post test signatures Perform -6 dB Acoustic runs before & after P/Qual level Acoustic test for pass/fail evaluation –Delete 5-50 Hz sine sweep Qual by analysis (LM is defining where there are inadequate margins for this) Interface potted inserts are tested by witness coupons that are bonded simultaneously on the sides of the Radiator panel during layup –These actions carry low to moderate risk per J. Ku –Cost savings ~$160,000 (8 LM EM x.75 month)?

7. GLAST LAT ProjectLAT Mgr’s Meeting October 13, 2004 7 LM De-scope Options (cont) X-LAT Thermal Testing –Perform Thermal Cycle test in air instead of thermal vacuum –This is primarily a workmanship test and there is low risk. –Violates MAR requirement for 4 Thermal Vacuum cycles. –Need to implement now to maximize savings (test preparations are underway) –Cost Savings ~$xxx,xxx (~1/2 of quoted cost)

8. GLAST LAT ProjectLAT Mgr’s Meeting October 13, 2004 8 LM De-scope Options (cont) Radiator Thermal Testing –Perform Thermal Vacuum and Thermal Balance testing of Radiators, but delete TCS validation test segments –Eliminates requirement for TCS EGSE –These tests have a lot of bang for the buck & Jack Goodman & the thermal cartel strongly recommends keeping them –Risk is having to perform troubleshooting during the LAT Thermal Vacuum test ($xx,xxx/day) –Cost Savings ~$50,000 EGSE + $50,000 (1 week) reduced test time?

9. GLAST LAT ProjectLAT Mgr’s Meeting October 13, 2004 9 Grid #2 Static Load Test To Go SLT budget –Grid Box #2 Assy Operations $34,170 –Design & Fab MGSE/fixtures $78,650 –Test $180,000 –Total$292,820 –Note: This test does not drive LAT schedule Risks –Test definition still in work (scope not fixed) –Test house not selected –If FE model doesn’t correlate then additional test cases will be required –There is sufficient budget for these contingencies De-scope options –None. This test allows deletion of LAT Sine Vibe (LAT de- scope). –Currently working to reduce number of load cases required.

10. GLAST LAT ProjectLAT Mgr’s Meeting October 13, 2004 10 TCS To Go Heater Control Box Budget –Fab & test Qual + 3 flight units$111,531 Control Integration Support –Software & EGSE for Radiator TCS test $83,485 –Total$195,016 Risks –Anomaly resolution during Box Qual program –Potential design changes (addition of EMI filters to HCB) De-scope options –Make first unit Protoqual and delete 4 th unit –Cost Savings ~$20K