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 4.1.9.6 Roadmap to I&T Readiness Review Larry Wai, IFCT Manager Tom Borden, IFCT Engineer

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

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

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

Room 104 Layout

Area 3: I&T Procedures Procedure Name Need Date Procedure Number Tracker Installation Procedure LAT-PS-03058-01 Calorimeter Installation Procedure XXX02 Critical Operations Procedure LAT-TD-03059-01 Room 104, Ingress and Egress of Large Equipment Procedure. LAT-TD-03060-01 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

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

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

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-03061-01 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

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-00676. 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

MOCKUP HARDWARE LIST

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

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

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

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

Tower Installation Sequence

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

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

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.

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.

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.

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.