GLAST LAT Project
LAT Mgr’s Meeting October 13, 2004
LAT Planning Meeting
Mechanical/Thermal Systems
October 2004
Marc Campell
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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
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LAT Mgr’s Meeting October 13, 2004
GLAST LAT Project
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.
LM headcount profile
LM Budget (Apr 04)
LM EM (Marc's
conversion)
LM ETC (ROM)
Delta
FY05 EM
165 hrs / month
hours
$$160/hour
Oct-04
$121,372
Nov-04 Dec-04 Jan-05 Feb-05 Mar-05 Apr-05 May-05 Jun-05 Jul-05 Aug-05 Sep-05
$110,864 $94,877 $245,877 $258,156 $94,474 $95,490 $86,708 $43,801 $22,702 $25,621 $29,625
4.52
18
4.33
18
4.36
18
9.60
8
10.61
8
3.21
8
3.55
4
3.23
4
1.56
4
0.89
1
0.87
1
1.10
1
-13.48
-13.67
-13.64
1.60
2.61
-4.79
-0.45
-0.77
-2.44
-0.11
-0.13
0.10
-45.17 EM
165
-7,453 HRS
-$1,490,692 potential overrun
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LAT Mgr’s Meeting October 13, 2004
GLAST LAT Project
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
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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 dB acoustic run for this)
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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 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 ~$160,000 (8 LM EM x .75 month)?
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GLAST LAT Project
LAT Mgr’s Meeting October 13, 2004
LM De-scope Options (cont)
• X-LAT Thermal Testing
– Perform Thermal Cycle test in air instead of thermal
vacuum
– This is primarily a workmanship test and there is low risk.
– Violates MAR requirement for 4 Thermal Vacuum cycles.
– Need to implement now to maximize savings (test
preparations are underway)
– Cost Savings ~$xxx,xxx (~1/2 of quoted cost)
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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 & 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?
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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.
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LAT Mgr’s Meeting October 13, 2004
GLAST LAT Project
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 4th unit
– Cost Savings ~$20K
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