GLAST Large Area Telescope: I & T Input to Monthly Technical/Cost/Schedule Review 03/30/06
GLAST Large Area Telescope: Cost/Schedule Review November 3, 2004
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Transcript of GLAST Large Area Telescope: Cost/Schedule Review November 3, 2004
GLAST LAT Project – Cost and Schedule Review November 3, 2004
AntiCoincidence Detector 1
GLAST Large Area Telescope:GLAST Large Area Telescope:Cost/Schedule ReviewNovember 3, 2004AntiCoincidence Detector (ACD) Subsystem WBS: 4.1.6
David J. ThompsonThomas E. JohnsonNASA Goddard Space Flight CenterSubsystem Manager/Instrument Manager
[email protected]@nasa.gov
Gamma-ray Large Gamma-ray Large Area Space Area Space TelescopeTelescope
GLAST LAT Project – Cost and Schedule Review November 3, 2004
AntiCoincidence Detector 2
Significant AccomplishmentsSignificant 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)
GLAST LAT Project – Cost and Schedule Review November 3, 2004
AntiCoincidence Detector 3
Recent Accomplishments - Electronic Component Recent Accomplishments - Electronic Component StatusStatus
ITEM Quantity Required
Flight (Spare)
Assembly Complete
Functional Testing
Conformal Coating
Thermal Testing
Ready for next assembly
Front End Electronics Boards
12
(4)
16 16 16 16 16
High Voltage Bias Supply 24
(6)
30 30 30 30 30
Photomultiplier Tube Assembly
196
(40)
16 10 0 10 0
GLAST LAT Project – Cost and Schedule Review November 3, 2004
AntiCoincidence Detector 4
Fabrication, Assembly and Testing statusFabrication, Assembly and Testing status
Blanket Stand-off
Flexure
Doubler
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
PrototypedClear fiber cables (130)
Number needed in parenthesis
130
6
12
All 89 + spares
All
All
45
1
8
8
360
1
360, All
130 (All)
88
8
8
1
GLAST LAT Project – Cost and Schedule Review November 3, 2004
AntiCoincidence Detector 5
Fabrication, Assembly and Testing statusFabrication, 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
GLAST LAT Project – Cost and Schedule Review November 3, 2004
AntiCoincidence Detector 6
TSA I&TTSA 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.
GLAST ACD I&T AETD Monthly 11-01-04
7
InitialTDA/TSA I&T in B7
ACD SubsystemEfficiency
Verification test(include rotate
ACD 90 degree)
EMI/EMC Test
Pre-shipReview (PSR)
Vibration Test
Thermal Balance/Thermal-Vac
Test
Mass Properties ACD ship to SLAC
Pre-EnvironmentalReview (PER)
Acoustic Test
Post-shipCheckout &
Full Functional Test at SLAC
Install & test 1st & 2nd flightChassis onto
ACD
Qual Electronics
ChassisEnvironmental
Test
1st flight chassis
Environmental Acceptance
Test
The remaining Seven Flight
Chassis Environmental
Acceptance tests
10/4 – 11/30 11/25 – 12/7 12/2 – 1/11
ACD FullFunctional
Test
Install ThermalBlanket &
MMS
2/10/05
Assemble last 2 rows of
TDAs & WSF (124-130, 224-230, 324-330, 424-430)
onto TSA
ACD Integrationcomplete
12/29/04 – 1/14/05
1/14/05 – 1/25/05
6/10 – 11/19 12/7 – 12/13
Install & test remaining six
flightChassis onto
ACD
12/14 – 1/13
1/14/051/25/05 – 1/27/051/27/05 – 2/10/05
2/11/05 – 2/23/052/23/05 – 3/4/05
3/4/05 –3/10/05 3/10/05 – 4/7/05 4/7/05 – 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 FlowI&T Flow
GLAST LAT Project – Cost and Schedule Review November 3, 2004
AntiCoincidence Detector 8
Near Term MilestonesNear Term MilestonesMilestone Description Date New Date Status/Notes
Complete PMT AssemblyJanuary,
2004
11/05/04 First group completed mid-October. See back up material for more information on PMT issue
Complete Qualification Unit Electronics Chassis Assembly
5/20/0410/1/04 COMPLETED
Complete Flight Mechanical Drawings
September12/1/04 One assembly drawings remains. Designer has been
focused on problem resolution, revisions, and EOs.
Complete installation of 25 top TDAs 10/15/0411/10/04 Initial installation and measurement verification
complete. Final installation underway.
Complete vibration testing of Spare/Qual Electronics Chassis
10/8/04COMPLETE
Complete qualification testing of new PMT mounting design
10/15/04COMPLETED ON 10/26
EMI Testing of Qual/Flight Spare Electronics Chassis
11/29/04Continuing to work on defining requirements that can be tested effectively and efficiently.
Complete environmental and functional testing of first 10 flight PMTs
11/10/04PMTs 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
GLAST LAT Project – Cost and Schedule Review November 3, 2004
AntiCoincidence Detector 9
InterdependenciesInterdependencies
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.
GLAST LAT Project – Cost and Schedule Review November 3, 2004
AntiCoincidence Detector 10
Issues, Concerns, Documentation, & Qual ProgramIssues, 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)
GLAST LAT Project – Cost and Schedule Review November 3, 2004
AntiCoincidence Detector 11
ACD Schedule VariancesACD 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.
GLAST LAT Project – Cost and Schedule Review November 3, 2004
AntiCoincidence Detector 12
ACD Cost VariancesACD 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
GLAST LAT Project – Cost and Schedule Review November 3, 2004
AntiCoincidence Detector 13
ACD Cost VariancesACD 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
GLAST LAT Project – Cost and Schedule Review November 3, 2004
AntiCoincidence Detector 14
Threats to Schedule and CostThreats 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.