Traveler (Work Instructions)


1.             Travelers require QA approval at any level beyond box or mechanical assembly level. Basically, if the TRAVELERS require interfacing with another subsystem or testing at the box level, QA must review and approve the TRAVELERS BEFORE work is started.


2.             The first task (entry) on any TRAVELERS shall be verification of documentation and hardware associated with the TRAVELERS. Material certs, Certificate of compliance or conformance from vendor, chemical analysis of materials or other documentation that verifies the materials to be used. Also check that the drawing and other documentation is the latest and under Configuration Management control. This is the subsystem leads responsibility to ascertain that all is in order before proceeding, but this is a Quality Assurance review step.


3.             The last step (task) on the TRAVELERS shall be for QA to review all documentation and hardware before further processing to the next higher level. (even if it goes to storage)


4.             The original TRAVELERS shall remain with the hardware until the hardware is incorporated into the next higher level of assembly. A copy of the TRAVELERS will then be incorporated into the assembly package. The original TRAVELERS (once signed off as completed with all associated NCRs closed) will be forwarded to Configuration Management for archiving.


Test Procedures


The first line in any test procedure related to final testing of flight hardware (again beginning at the subsystem level) shall state "Notify QA 24 hours prior to the start of this test. QA will verify test equipment set up and calibration, review current documentation, review personnel certifications and decide if QA presence is required during the testing phase."




All flight hardware procurements must be routed through QA prior to release for approval.  QA will ensure are MAR requirements are flowed-down, correct standards are referenced, materials, processes and electronic parts are on their respective lists, proper documentation (certifications, etc.) is requested, etc.


Assembly of Flight Hardware


Any assembly of flight hardware that requires torquing of fasteners must be witnessed by QA. These steps shall be called out in the TRAVELERS with QA as the responsible party to sign off on the step. Any lifting operations require safety sign off and presence during the lifting operations.


Nonconforming Material and Test Reports



LAT (and GSFC) quality policy requires that all non-conformances found in materials, fabrication, assembly or testing be documented on a NCR. No subset of lesser documentation is permitted.


Simple scratches in surfaces that might not affect performance still need to be entered and dispositioned. It is everyone's responsibility (not just QA) to capture these non-conformances and document the corrective action.



Darren S. Marsh

GLAST Large Area Telescope Project

Stanford Linear Accelerator Center

2575 Sand Hill Road, M/S 43A

Menlo Park, CA 94025


(650) 926-4577