Gamma-ray Large
Area Space
Telescope
GLAST Large Area Telescope:
Manufacturing Preparation
Design Engineering Meeting
Jerry Clinton
1 April 2003
Stanford Linear Accelerator Center
Stanford, CA
Procurement Process Flow
GLAST LAT Procurement Process
Start Procurement
Process
Yes
Yes
Part/mat’l
approved by
PCB/MPRB?
Drawing/spec
released?
No
No
Complete part/
material approval
process
Complete drawing
or spec and get it
released
Yes
Funding in
place?
Sole source?
No
Get funding
authorized
Yes
Complete Sole
Source Justification Form (Purchasing web page)
Memo format is no longer
acceptable. All questions
must be answered. Personal
preference is not adequate
justification for sole source
procurement.
Ensure first words in
Description block are
GLAST PARTS.
Delivery location is BLDG
33, NOT YOUR OFFICE
Complete PR on
BIS and print it out
QA review and
approval
IPO review and
approval
Debbie or Diana
enter PR into BIS
Prepare
supporting
documentation
package
QA review
Ensure documenttion package is
clearly labeled
GLAST
Deliver
documentation
package to Tom
Murphy




Specification(s)
Drawing(s)
Quotation (if recent)
Sole Source Justification
Support buyer as
requested
End
Manufacturing Requirements
• Drawings and specifications must be released
• Parts and materials must be listed on PIL and must be approved
by PCB or MPRB as appropriate
• All parts and materials must be issued from flight stores
• Completed flight assemblies must be kept in flight stores
• Work must be authorized via an approved Assembly and
Inspection Data Sheet (AIDS)
Manufacturing Process
• Closed loop
– Parts and materials issued in kits from stores
– Kit is assembled, tested, and inspected
– Delivery of assembled kit to stores closes the loop
– Maintains clear traceability of parts, materials, and finished
flight items
• Approved AIDS is required to start the process
– Applies to fabrication, assembly, test, and inspection
• Does not apply to fabrication where supplier procures
raw materials
– If work is to be performed by a subcontractor, their travelers
should be attached, or PO should require supplier to make
them available for review by SLAC and Government
personnel
Manufacturing Process - Continued
• Stock room verifies item is ready for manufacturing prior to
pulling kit
– Drawings and/or specifications released
– Test procedures released
– Parts approved
• Completed AIDS ends the process
– Last step is to deliver to stores
Assembly and Inspection Data Sheets
• AIDSs are LAT work orders
– Authorize taking parts and materials out of stores and
performing work to manufacture flight hardware
– Defines operations executed to fabricate, assemble, and test
LAT hardware items
– Provide traceability from raw materials to finished flight
items
– Required for all LAT manufacturing activities including
outside fabrication and assembly
• LAT-MD-01624
– AIDS preparation instructions
– Provides some guidelines on work instruction preparation
• Accessed from Quality Assurance web page
AIDS List Screen
AIDS Entry Screen (Top Portion)
AIDS Entry Screen (Bottom Portion)
Check Screen
AIDS List with New Record
Report Screen
Update Screen
Updated Report Screen