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Gravity Probe B

Testing Einstein's Universe

WEEKLY HIGHLIGHTS FOR WEEK ENDING 15 May 1998:

STANFORD HIGHLIGHT
The readout group has held a successful Squid Package Acceptance Review on May 14 for the required four Science Flight SQUIDS (SM1, SM2, SM4, SM7). Certificates of Compliance will be signed on May 28. Photo: Science Instrument Assembly.

SPACE VEHICLE HIGHLIGHT
Helium thruster flight unit S/N F002 has successfully completed all of its acceptance tests. The Hot/Cold Characterization Acceptance Test, which functionally tested and acquired thruster performance data at 7 supply pressures and temperatures, was the final test. The GP-B Helium Thruster Isolation Valve (TIV) qualification unit assembly is complete. Qualification testing is beginning, and assembly of eighteen flight units is underway (16 flight, 2 spares). Photo: Engineer Rose LaLanne and and university/industry engineering co-op Jon Lee remove Helium Flight Thruster #2 from its thermal-vacuum testing chamber.

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