Transcript ppt

GLAST LAT Project
Gamma-ray Large
Area Space
Telescope
Subsystem Managers Meeting May 12, 2004
GLAST Large Area Telescope:
LAT Schedule
Lowell A. Klaisner
Stanford Linear Accelerator Center
Project Manager
[email protected]
650-926-2726
1
GLAST LAT Project
Subsystem Managers Meeting May 12, 2004
LAT Schedule
• “Tight and success oriented”
– Too little success
• Tighter now than a month ago
• We are still at the starting gate
• Adding schedule won’t solve problem by itself
– Slipping 4 weeks in a month does not converge
– Need to improve our execution
• We can not “sell” a schedule until we have demonstrated some
success fabricating flight hardware
• This is a project wide issue and we need to work together to
resolve the issue – no whining – no blame
• Need to develop work arounds and ways to execute in parallel
• The other option is descoping the instrument
– Removing towers
• Very painful to delay delivery of the instrument to observatory
integration
2
GLAST LAT Project
Subsystem Managers Meeting May 12, 2004
Major Schedule Issues Through CD-4
• Tracker
– MCM startup and production rate
– Attachment to the Grid and associated fixtures
– 2 per month limit on final assembly and check out at Pisa
• Work is expanding – Alignment
• Calorimeter
– AFEE boards
• DAQ
– Parts procurement
– EGSE procedures
– Startup of manufacturing
• Design closure and drawings
– Late flight software
• Mechanical
– Tracker to Grid interface design and implementation
3
GLAST LAT Project
Subsystem Managers Meeting May 12, 2004
Issues Continued
• Integration and Test
– Timely completion and qualification of the GSE
• General
– EMI/EMC issues developing late
– Incomplete documentation
4
GLAST LAT Project
Subsystem Managers Meeting May 12, 2004
Tracker MCM Production
TMCM FLIGHT PRODUCTION
220
200
TMCM Units
180
160
140
MIP-4
Baseline
120
100
80
60
40
20
WeekEnding
MIP-1
MIP-2
MIP-3
MIP-4
Baseline
/2
00
4
6/
26
/2
00
4
6/
19
/2
00
4
6/
12
20
04
6/
5/
/2
00
4
5/
29
/2
00
4
5/
22
/2
00
4
5/
15
20
04
5/
8/
5/
1/
20
04
/2
00
4
4/
24
/2
00
4
4/
17
/2
00
4
4/
10
4/
3/
20
04
0
Week Ending
04/03/04
04/10/04
04/17/04
04/24/04
05/01/04
05/08/04
05/15/04
05/22/04
05/29/04
06/05/04
06/12/04
06/19/04
06/26/04
0
0
0
0
0
0
6
5
9
25
17
50
28
75
40
100
125
150
175
200
225
5
5
9
25
17
50
28
75
40
100
125
150
175
Post Burn-in
Shipped
Baseline
Note: The numbers are accumulative
Shaded cells contain projected data
5
GLAST LAT Project
Subsystem Managers Meeting May 12, 2004
One Plan for Schedule Recovery
• Complete 2 tower testing in parallel with remaining integration
– Components of Towers A&B to I&T without thermal vacuum
testing
– They will be installed in the 1X4 grid for single tower testing
and two tower Comprehensive Performance Test on the
original schedule
– Tower 1 components will go through thermal vacuum test at
the subsystem and be delivered to I&T on approximately
the original schedule. Integration will proceed as planned
– The 1X4 assembly will be put through thermal vacuum test
in California making components of A&B towers ready for
integration
– Risk is that a systemic problem will show up in the T/V test
of tower 1 (the third tower)
• Mitigated by EM and Tray level testing
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GLAST LAT Project
Subsystem Managers Meeting May 12, 2004
Other possibilities
• System test
– What can be begun before all equipment integrated?
– Can some tests be delayed until NRL?
• Can we reduce and/or consolidate component testing?
– With minimal increase in risk
• Can work be redistributed to where resources are available?
– Some of Tracker tower integration at Alenia?
– Some alignment moved to SLAC?
• Etc?
– Discuss at this meeting
– Where are the bottlenecks and what can we do about them?
7
GLAST LAT Project
Subsystem Managers Meeting May 12, 2004
Working Schedule
TKR A
07/02/04
TKR 14
12/21/04
ACD
11/03/04
07/28/04
01/25/05
01/05/05
CAL A
07/09/04
CAL 14
12/2/04
DAQ
11/01/04
01/11/05
01/21/05
TEM/PS 14
10/05/04
01/07/04
X-LAT
08/12/04
08/12/04
FSW
Formal
Test
02/18/05
12/15/04
Install
Twrs 1-13
13 wks
Install
Tower 14
1 wk
Install Gbl
Items
6 wks
08/12/04
07/12/04
08/13/04
TEM/PS A
05/12/04
08/02/04
GRID
Assembly
06/11/04
07/22/04
Install
Twrs A&B
8 wks
2 Tower
CPT
3 wks
01/04/05
01/28/05
FSW
Complete
12/13/04
12/15/04
01/10/05
02/04/05
02/23/05
03/18/05
05/11/05
06/07/05
System
Test
11 wks
10/31/05
10/31/05
Float
9 wks
Ship LAT
1 wk
Enviro
Test
15 wks
Float
4 wks
LAT
RFI
Observ.
Integration
Launch
02/07
5 Weeks
Dates
Nov '03
May '04
Pre-Test / CD-4
Review
07/14/05
Pre-Ship
Review
12/01/05
Color Code
Subsystem
I& T
Test
Mission
8
GLAST LAT Project
Subsystem Managers Meeting May 12, 2004
LAT Schedule
• “Tight and success oriented”
– Too little success
• Tighter now than a month ago
• We are still at the starting gate
• Adding schedule won’t solve problem by itself
– Slipping 4 weeks in a month does not converge
– Need to improve our execution
• We can not “sell” a schedule until we have demonstrated some
successful fabrication of flight hardware
• This is a project wide issue and we need to work together to
resolve the issue
• Need to develop work arounds and ways to execute in parallel
• The other option is descoping the instrument
– Removing towers
• Very painful to delay delivery of the instrument to observatory
integration
9