Chandra Status Report
July 6, 1999

George H. Diller
Kennedy Space Center, Fla.

The end-to-end test of the Chandra/IUS-27 payload was successfully completed on Saturday. This verified the communications path to Chandra, commanding it as if it were in space aboard Columbia. Participating are Chandra's Operations Control Center located in Cambridge, MA, Mission Control at the Johnson Space Center in Houston, the IUS control facility at Sunnyvale, CA, and the communications assets of both the Deep Space Network and the Tracking and Data Relay Satellite (TDRS) system. Also over the weekend, the Chandra flight batteries which were previously installed into the telescope at the Vertical Processing Facility were charged for flight.

The IUS flight readiness test began on Monday and concluded successfully this morning. Among other things, this test loaded the flight software into the IUS, calibrated the inertial measurement unit used for guidance. Separately, the thrust vector control system used for steering was also tested.

The two-day operation to install the IUS flight batteries begins tomorrow, July 7. The IUS stand-alone countdown simulation is scheduled to begin on Thursday night, July 8, and will be completed on Friday.

Columbia's payload bay doors will be closed for flight on July 17, based on the current Chandra/IUS-27 processing schedule which targets a launch on July 20.

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