GLAST LAT Project
LAT Mgr’s meeting July 17-18, 2003
LAT Planning Meeting
Mechanical Systems
Marc Campell
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LAT Mgr’s meeting July 17-18, 2003
GLAST LAT Project
X-LAT Thm
I/F Des+EM
MECH Work Flow Summary
12SEP03
16APR04
13FEB04
MGSE
Des & Fab
MGSE
Des & Fab
30JAN04
12MAR04
30APR04
30APR04
TF Bond
Qual
28NOV03
30JAN04
19DEC03
Dates TBR
05DEC03
Matl AV
12SEP03
MGSE Des
& Fab
21NOV03
CAL-Grid
I/F Des+EM
12SEP03
GB Stress
Analysis
15AUG03
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GLAST LAT Project
LAT Mgr’s meeting July 17-18, 2003
Interdependencies with other subsystems,
instrument office, and/or project office.
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CSE – Analysis support for design release
S/C - need tool to drill S/C I/F on Grid & flexures for test?
TRK – need matched tooling to drill TRK-Grid I/F
ACD – need BEA to match drill BEA
LM – X-LAT plates needed for GBA testing prior to delivery to I&T
– Radiators needed for LAT environmental tests
PO – LM ITAR hardware in B33
ELEC – TCS design, prototype fab & EGSE design & fab for Radiator
Thermal balance test
ELEC needs
– Release of E-box enclosure designs
– X-LAT plate thermal performance
I&T - Schedule space in B33 for MECH assy & test
I&T needs - Grid to start integration
– X-LAT design drives accessibility to E-boxes
– EMI skirt & Grid provisions for ground cooling
– Jeff Wang responsible for thermal analysis of ground cooling
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GLAST LAT Project
LAT Mgr’s meeting July 17-18, 2003
Flight hardware procurements – schedule for
existing and plans for remaining
• Long-Lead Procurements
– Aluminum Billets due 8/26 (what is the flaw size
requirement)
– Heat pipe extrusions (LM - placed)
– Solid State thermostats have been replaced with standard
bimetallic thermostats
• Major Upcoming Procurements Near-Term (< 4 months)
– Lockheed Martin Phase 2 – placed
– Grid Assembly - 7/30 place contract (quotes due 7/18)
– Flight Hardware for Thermal Control System - started
• Minor Upcoming Procurements
– GSE – 6 designs est Nov 03
– Grid Assembly Fixtures, Test Equipment est Dec 03
– Thermal-cycle Test Fixtures est Jan 04
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GLAST LAT Project
LAT Mgr’s meeting July 17-18, 2003
Flight Hardware Manufacturing Plans
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3 Assy plans
Drafts
3 Assy Procedures
Not Started
~12 Process Specs (some used by LAT) Not Started
2 Test Plans
Not Started
2 Test Procedures
Not Started
• Does not include LM or Grid Vendor plans & procedures
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GLAST LAT Project
LAT Mgr’s meeting July 17-18, 2003
Engineering Model Testing Closure
• CAL-Grid Joint Testing
– No further tests planned for Shear plates
– CAL bolt preload vs. torque statistical sampling
• X-LAT thermal joint testing
– Coupon level thermal tests of candidates
– Mock up E-box stack-up with heaters on sidewalls to
simulate electronics heat source and flight like installation
procedures to identify potential process problems (who’s
responsible? ELEC?)
– Perform Random Vibe and Thermal Vacuum tests if
required
• 1x4 Grid
– Static load test (FEM verification)
– CAL Shear plate installation/removal validation
– CAL installation demo (TRK cable-EMI skirt clearances)
– Purge gas system demo? (what is reqmt for flow rate?)
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GLAST LAT Project
LAT Mgr’s meeting July 17-18, 2003
Engineering Model Testing Closure (cont)
• Grid top flange heat pipe bonding process qualification
– Validate tooling
– Demo process control
• Demonstrate Radiator installation process
– 6 wet RTV joints in vertical orientation & restricted access
– Demo with Radiator +Z and +X up
– Complete within pot life limits (bonded & torqued)
– Verify bond line integrity (uniform thickness & % voids)
• Demonstrate Radiator removal process
– Separate 6 joints with restricted access
– No damage or distortions of heat pipes
– Verify material can be cleaned up & surface prepared again
for another bond
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GLAST LAT Project
LAT Mgr’s meeting July 17-18, 2003
Open Flight Design Issues
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Finalize CAL-Grid interface design
Finalize X-LAT to E-box design
Close the loop on Grid-ELEC interface (grounding & EMI)
Delete Radiator level EMI test requirement? (perform EM test w/ D.
Nelson)
5. Mechanically install Radiators for LAT EMI test? (EMI test plan out for
review)
6. Grid-TRK interface define Grid datums & TRK tooling interface
7. Define GBA Static Load test requirements & plans
8. S/C Flexures for GBA static load test?
9. GBA Thermal cycle vs Thermal Vacuum test approval
10. RFA on adding a U heat pipe to X-LAT plate in case of XLHP failure
11. Other RFA’s closure
12. Examine removing X-LAT plates from GBA static load and thermal
cycle tests to beak schedule dependency
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GLAST LAT Project
LAT Mgr’s meeting July 17-18, 2003
Concerns & Risks
1. Will we be ready to cut Grid chips on Sep 12?
a. Detailed stress analyses complete
b. Design mods incorporated
c. Successful MRR
2. Manpower (Engr & Techs) availability
3. Details of how, where & who for Grid Box Assembly work
(Larry Wai)
4. Finalizing CAL & X-LAT designs
a. EM testing & flight grid fab in parallel
5. Cost &availability of EGSE for Radiator Thermal Balance Test
6. Adequate support for LM efforts
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