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Gravity Probe B

Testing Einstein's Universe

WEEKLY HIGHLIGHTS FOR WEEK ENDING 8 SEPTEMBER 2000:

PAYLOAD HIGHLIGHT
The gyroscope #4 replacement team has completed the installation of the vacuum can onto the flight probe thereby completing NASA milestone CM-08: Gyro #4 Remove and Repair Complete. In addition, the probe has been moved to the class 1000 room to allow the room temperature recheck of the gyroscopes.

Photo: Ken Bower inspecting the probe for contaminants under monochromatic light before replacing the vacuum can.
Please click the small photo to see an explanation of the remarkable change-out of Gyro #4

SPACE VEHICLE HIGHLIGHT
All 16 Thruster Isolation Valve (TIV) electrical interfaces were successfully tested on the GP-B spacecraft using both A and B sides of the Attitude Control Electronics (ACE). The engineering unit TIV was connected to each interface and commanded to close and then open. The TIV open/close state was verified both visually and with EGSE.

Photo: LM Engineers Paul Dulgov and Jon Kirschenbaum with the GP-B spacecraft and TIV test setup in LM B/205.

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