Chandra Status Report
March 26, 1999

George H. Diller
Kennedy Space Center, Fla.

In the Vertical Processing Facility (VPF) at KSC, work continues on schedule toward the launch on July 9 of the Chandra X-ray telescope aboard Space Shuttle Columbia on mission STS-93.

Chandra successfully completed an overall state of health test on March 17 and the attitude control thrusters were helium flow-tested the following day without issues.

The solar arrays were installed on March 26 and testing of the mechanical and electrical interfaces is underway. One of the solar arrays is to be fully deployed today or Saturday as part of a mechanical check and some limited work.

In parallel, the Payload Operations Procedure (POP) test is underway which verifies the network command telemetry path from the telescope through the Deep Space Network to the ground control station at Harvard University.

On March 31, Chandra will be hoisted from its test stand onto a fueling stand. Loading of fuel into the spacecraft is currently planned to begin on April 5 and will take ten days to complete. These bi-propellant hydrazine and nitrogen tetroxide fuels will be used by the telescope to achieve its final orbit. Hydrazine will also be used by one of the telescope's subsystems associated with pointing the telescope.

Finally, the spacecraft's batteries will be installed on April 17. Chandra will then be ready for the arrival at the VPF of the Inertial Upper Stage Booster on April 19.

Chandra arrived at KSC's Shuttle Landing Facility aboard an Air Force C-5 airplane on Feb. 4.

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