GLAST LAT Project 11 October 2005

LAT System Engineering System Checkout Planning

GLAST LAT GLAST LAT System Engineering

Gamma-ray Large Gamma-ray Large Area Space Area Space TelescopeTelescope

System Checkout TestTest Objectives & Plans

Rich Baun, Pat Hascall

rbaun@slac.stanford.edu(650) 926-3520hascallp@slac.stanford.edu(650) 926-4266

GLAST LAT Project 11 October 2005

2LAT System Engineering System Checkout Planning

System Engineering DeliverablesSystem Engineering Deliverables

Performance and Operations Test Plan– Current status

• Tests through integration of 16 towers and ACD are detailed

• Integration of 3rd layer boxes and full LAT acceptance test definitions in work

– Plan forward results in the Performance and Operations Test Plan to go into signature by the end of October with sufficient detail to cover all testing to be performed at SLAC prior to shipment to NRL

T&C Data base inputs include limits and conversion coefficients. – Excel sheet to go into LATDocs signoff by end of week– I&T will use this info first for near term testing– Process in work to feed back these limits and

conversion coefficients back into the T&C data base in a way that does not involve or affect FSW

GLAST LAT Project 11 October 2005

3LAT System Engineering System Checkout Planning

Plan ForwardPlan Forward

Team identified for a near term effort to scrub the test definitions and provide info to complete the P&OTP for pre-environmental test needs– First meeting tomorrow– Verification matrix completed with preliminary verification

description for all items– Verification items requiring test or demonstration mapped

to test cases (including redundancy combinations)– First scrub completed and questions defined– Will separate into subteams to discuss groups of

verifications and how they fit into tests• Goal is to minimize the number of test cases• Goal is to use subsystem verification where possible to

minimize detailed testing at the LAT level– Rich Baun will recombine team inputs into the P&OTP

Remainder of the P&OTP updates to cover (for example) thermal control system testing during TV will follow

GLAST LAT Project 11 October 2005

4LAT System Engineering System Checkout Planning

Problems/IssuesProblems/Issues

Clearly we need help from the team (Neil, Hiro, Eric Grove, Dave Thompson, JJ, Mike Huffer (or alternate), Lester, Eduardo, Steve and Dick) to use the combined expertise to develop an efficient test program

T&DF and FSW are areas that we need the most support– To ensure that we have the right set of tests based on

the way the LAT operates– To ensure that we can show the customer that we are

compliant with our specifications (may require spec updates)