1. GLAST Large Area Telescope:
Gamma-ray Large Area Space Telescope
GLAST Large Area Telescope:
I&T Subsystem
Dept. of Integration, Facilities, Configuration, and Test (IFCT)
WBS
Roadmap to I&T Readiness Review
Larry Wai, IFCT Manager
Tom Borden, IFCT Engineer

2. Areas of preparation Preparation schedule for IRR Facility readiness
I&T procedures
Technician training & procedure validation w/ mock-ups
Survey and alignment

3. Area 1: Prep schedule
See Tom’s MS project file

4. Area 2: Facility readiness
Facility checklist:
Purge lines – flight certification by 3/17
Firewall – completion by 3/31
MGSE earthquake plan – completion by 3/31
Facility plan – update by 3/31
QA Facility Readiness Review – early April

5. Room 104 Layout

6. Area 3: I&T Procedures Procedure Name Need Date Procedure Number
Tracker Installation Procedure
LAT-PS
Calorimeter Installation Procedure
XXX02
Critical Operations Procedure
LAT-TD
Room 104, Ingress and Egress of Large Equipment Procedure.
LAT-TD
Shear Plate Removal Procedure
XXX05
Shear Plate Assembly and Liquid Shim Procedure
XXX06
DSHP and Heat Pipe Patch Panel Mounting Procedure
XXX07
E-Box 3rd Layer Flatness Check
XXX08
GASU Mounting Bolt Torque Procedure
XXX09
Bulkhead Panel Torque Procedure
XXX10
SIU/EPU/MTY Mounting Bolt Torque Procedure
XXX11
SIU Flight Software LPT Procedure
XXX12

7. I&T Procedures - Continued
Procedure Name
Need Date
Procedure Number
EPU Flight Software LPT Procedure
XXX13
GASU-ACD FREE Simulator LPT Procedure
XXX14
Heater Control Box LPT Procedure
XXX15
Grid Box Electrical System LPT Procedure
XXX16
Ground Cooling System Operating Procedure
XXX17
Single-Bay LPT Procedure
XXX18
Two-Bay LPT Procedure
XXX19
Multi-Bay LPT Procedure
XXX20
LAT Aliveness procedure
XXX21
LAT LPT Procedure
XXX22
LAT CPT Procedure
XXX23

8. I&T Procedures - Continued
Procedure Name
Need Date
Procedure Number
LAT Internal Optical Survey
XXX24
LAT External Optical Survey
XXX25
LAT Muon Survey Operating Procedure
XXX26
Van de Graaff Operating and data taking Procedure
XXX27
Thermal Fly-Away Instrumentation Installation and Check-Out Procedure
XXX28
Accelerometer Installation and Check-Out Procedure
XXX29
Clean Room High-Bay Door Access Procedure
XXX30
ACD Lift Bracket Mounting Procedure
XXX31
ACD Mounting Bolt Torque Procedure
XXX32
ACD LPT Procedure
XXX33
ACD CPT and Timing Test Procedure
XXX34

9. I&T Procedures - Continued
Procedure Name
Need Date
Procedure Number
X-LAT Heat Pipe Shimming Procedure
XXX35
X-LAT Plate Bolt Torqueing Procedure
XXX36
Ground Cooling System Leak Check Procedure
XXX37
TPS-TEM Box Mating Procedure
LAT-TD
TEM/TPS Mounting and Shimming Procedure
XXX39
CAL Module LPT Procedure
XXX40
TKR Module Mounting Procedure
XXX41
TKR Optical Survey
XXX42
TKR Module LPT Procedure
XXX43
CAL Module Fastener Installation and Torqueing
XXX44

10. Area 4: Technician training and procedure validation w/ mock-ups
The main purpose of the mock up hardware will be to exercise and validate the integration sequences outlined in LAT-MD Validation of rework and repair sequences.
Additional purposes include and are not limited to:
Exercise AI&T documentation (integration procedures, installation logs, etc)
Identify issues with the cable integration sequence.
Identifying any potential issues with the MGSE hardware
Identify floor usage space issues (crane restrictions, cart access space, etc)
Train personnel for flight hardware integration.
Exercise crane operations for flight hardware integration.
Exercise de-integration operations and identify any potential problems
Validate replacement of Tracker Tower sequence

11. MOCKUP HARDWARE LIST

12. Other training activities / tools
Complete design and fabrication of Tracker mock-up
Complete design, fabrication and use of Tracker Flex Cable installation tools
Complete modifications to Calorimeter installation tools
Verify installation sequence for single Tower

13. Area 5: Survey and alignment
Complete Tower alignment tolerance study
Design and fabricate Tracker alignment tools
Design Tracker installation tools
Verify Tracker installation and alignment tools

14. Addendum: Installation flow and procedures
Roadmap to I&T Readiness Review

15. COMPONENT INTEGRATION FLOW
RECEIVE CALORIMETER TEM/TEM PS (FLIGHT UNITS)
RECEIVE TRACKER TOWER (FLIGHT UNITS)
TEST TOWER
METROLOGY BAY FOR SHIMMING & ASSEMBLY
INSTALL TRACKER IN SINGLE BAY & TEST
INSTALL TOWER INTO GRID
TEST CAL & TEM/TEM PS
ASSEMBLE SINGLE BAY
FINAL TEST

16. Tower Installation Sequence

17. Electronics Installation Flow
RECEIVE ELECTRONICS BOXES
INSTALL & SHIMM AS NECESSARY
INSTALL CABLES
TEST

18. ACD Installation Flow FINAL TEST RECEIVE ACD TEST ACD
INSTALL ACD ONTO GRID
FINAL TEST

19. Tracker installation Procedure
Lower the Tracker until the mounting holes in the flexures are approximately aligned with the corresponding holes in the grid.
Slowly adjust the vertical position of the Tracker until the special installation studs can be installed through the empty conical holes of the flexures at the +X, +Y and the -X, -Y corner locations. Turn the special installation studs several turns into the threaded holes in the grid.
Adjust the position of the Tracker by translating it along a line joining the +X, +Y and the -X, -Y special installation studs and by rotating the Tracker about this line until a third special installation stud can be installed in the conical hole at the +X, -Y corner location. Turn the special installation stud several turns into the threaded hole in the grid.
One at a time, turn each of the three special installation studs into the threaded holes in the Grid until each of the three studs is bottomed on the steel sleeve in the Grid. Torque each of the studs to TBD Newton Meters.
Using feeler gauges measure and record the minimum and maximum gap between the flexures and the Grid at each of the three fittings which contain the special installation studs. As a check on the assembly tolerances, the maximum gap should not be larger than the minimum gap by more than TBD microns.

20. Tracker installation Procedure – Cont.
Assemble a combination of shims for each of the three locations which has a total thickness which is less than the gap at that location by not more than 25 microns.
At the +X, -Y corner location remove the special installation stud and install the combination of shims for that location between the flexure and the Grid. Install a flight stud through the empty conical hole in the flexure and through the holes in the shims and into the threaded hole in the Grid. Torque the flight type stud to TBD Newton Meters beyond the running torque of the locking feature. Install a concentric cone, load washer and hex nut at this location. While holding the load washer to prevent rotation, torque the hex nut to TBD Newton Meters beyond the running torque of the locking feature.
Repeat step 7 at the +X, +Y corner location.
Repeat step 7 at the -X, -Y corner location.

21. Tracker installation Procedure – Cont.
While holding the load washers to prevent rotation, torque the hex nuts in the three locations to TBD Newton Meters beyond the running torque of the locking feature in the order +X, -Y then +X, +Y and then -X, -Y. Repeat this torquing sequence for TBD Newton Meters beyond the running torque of the locking feature.
Using feeler gauges measure and record the gap between the flexure and the Grid at the -X, +Y corner fitting. As a check on the assembly tolerances, the maximum gap should not be larger than the minimum gap by more than TBD microns. Assemble a combination of shims for this location which has a total thickness which is less than the minimum gap at this location by not more than 25 microns.
Install the combination of shims and a flight stud at this location and torque the stud to TBD Newton Meters beyond the running torque of the locking feature. Install a pair of eccentric cones, a load washer, and a hex nut at this location. While holding the load washer to prevent location, torque the hex nut to TBD Newton Meters beyond the running torque of the locking feature.

22. Tracker installation Procedure – Cont.
Using feeler gauges, measure and record the minimum and maximum gap between the flexure and the Grid at the four side flexure locations. As a check on the assembly tolerances, the maximum gap should not be larger than the minimum gap by more than TBD5 microns. Assemble a combination of shims for each of the four locations which has a total thickness that is less than the minimum gap at that location by not more than 25 microns.
At each side flexure location install the appropriate combination of shims between the flexure and the Grid and install and torque two flight studs to TBD Newton Meters beyond the running torque of the locking feature.
At each side flexure location install a pair of eccentric cones, a load washer, and a hex nut on each flight stud.
Working in the order +X, -X, +Y, and then –Y, torque the hex nuts at each location to TBD Newton Meters beyond the running torque of the locking feature while holding the load washers to prevent rotation.
Repeat step 16 for torque values of TBD Newton meters beyond the running torque of the locking feature and then to TBD Newton Meters beyond the running torque of the locking feature.