Chandra Status Report
July 2, 1999

George H. Diller
Kennedy Space Center, Fla.

Among STS-93 payload activities this past week, the installation of the Chandra/IUS combination into Columbia's payload bay was performed as scheduled on Sunday, June 27. This was followed with the start of the interface verification test (IVT) on Wednesday, June 30. The test was successfully completed last night with no significant issues or concerns. The IVT verifies the electrical connections with the orbiter and the ability of the astronauts to command the payload from Columbia's flight deck. Also on Thursday, the IUS computer memory battery was installed.

The end-to-end test began this morning. This is an 18-hour test to check 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.

Over this weekend, the Chandra telescope's flight batteries are scheduled to be charged.

The remaining milestone activity primarily involves the IUS and includes a flight readiness test on July 5, the installation of flight batteries on July 7-8, and an IUS stand-alone countdown simulation on July 9.

Columbia's payload bay doors are to 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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