Chandra Status Report
Feb. 25, 1999

George H. Diller
Kennedy Space Center, Fla.

In the Vertical Processing Facility (VPF) at KSC, work continues on schedule toward the launch of the Chandra X-ray telescope aboard Space Shuttle Columbia on July 9 on mission STS-93. The component rework of the Command and Telemetry Unit (CTU) is being completed this week. The CTU will arrive from the vendor Saturday, Feb. 27 and be re-installed into Chandra on Monday, March 1. The Interface Unit (IU) was removed from Chandra on Feb. 14 for rework and will be returned to KSC and re-installed on March 7. The CTU and IU will undergo testing March 8-12.

A full state-of-health test for the telescope is scheduled to occur March 18. The attitude control thrusters will be helium flow-tested the following day.

Planning is underway for the arrival of the solar arrays. They are being transported by C-17 aircraft to the Shuttle Landing Facility with arrival currently scheduled for March 9. Operations to mate the arrays to Chandra are scheduled for the week of March 23 and they will be fully deployed for testing on March 27.

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 of 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 Apr. 19.

Chandra arrived at KSC's Shuttle Landing Facility aboard an Air Force C-5 airplane on Feb. 4. It was offloaded and transported to the VPF on Feb. 6. The telescope was removed from the shipping container on Feb. 8. It was rotated to the vertical position and placed in a test stand on Feb. 10.

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