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Gravity Probe B

Testing Einstein's Universe

WEEKLY HIGHLIGHTS FOR WEEK ENDING 21 MARCH 2003:

ACE AVAILABLE FOR INTEGRATION ON TO SPACE VEHICLE
The ACE has been returned from Spectrum Astro in preparation for installation of the unit on to the space vehicle scheduled for early next week. A system level review has cleared the way for the subsequent use of the ACE. The PDU unit successfully operated on the space vehicle in a series of tests including the A and B side functional test and a safe mode test. The software team loaded the latest version of the flight software (version 3.4.0.1) on to the vehicle. Testing of this new software version is currently in progress.

Photo: The GP-B spacecraft outside the thermal vacuum chamber (taken from inside the chamber).

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