GLAST LAT Project LAT Mgrs Meeting October 13
GLAST LAT Project LAT Mgr’s Meeting October 13, 2004 LAT Planning Meeting Mechanical/Thermal Systems October 2004 Marc Campell 1
GLAST LAT Project LAT Mgr’s Meeting October 13, 2004 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 2
GLAST LAT Project LAT Mgr’s Meeting October 13, 2004 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. 3
GLAST LAT Project LAT Mgr’s Meeting October 13, 2004 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 4
GLAST LAT Project LAT Mgr’s Meeting October 13, 2004 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 d. B acoustic run for this) 5
GLAST LAT Project LAT Mgr’s Meeting October 13, 2004 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 d. B 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 ~$160, 000 (8 LM EM x. 75 month)? 6
GLAST LAT Project LAT Mgr’s Meeting October 13, 2004 LM De-scope Options (cont) • X-LAT Thermal Testing – Perform Thermal Cycle test in air instead of thermal vacuum – This is primarily a workmanship test and there is low risk. – Violates MAR requirement for 4 Thermal Vacuum cycles. – Need to implement now to maximize savings (test preparations are underway) – Cost Savings ~$xxx, xxx (~1/2 of quoted cost) 7
GLAST LAT Project LAT Mgr’s Meeting October 13, 2004 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 & 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? 8
GLAST LAT Project LAT Mgr’s Meeting October 13, 2004 Grid #2 Static Load Test To Go • SLT budget – Grid Box #2 Assy Operations – Design & Fab MGSE/fixtures – Test – Total $34, 170 $78, 650 $180, 000 $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 descope). – Currently working to reduce number of load cases required. 9
GLAST LAT Project LAT Mgr’s Meeting October 13, 2004 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 ~$20 K 10
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