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From: starrfie@hydro.la.asu.edu (Sumner Starrfield) Subject: COSTAR Works but the coproc. has problems (film at 11) (fwd) Date: Wed, 8 Dec 93 20:22:52 MST Forwarded message: >From HRSSHORE%STARS.decnet@hrs.gsfc.nasa.gov Wed Dec 8 20:21:11 1993 Date: 8 Dec 93 22:23:00 EST From: "STARS::HRSSHORE" <HRSSHORE%STARS.decnet@hrs.gsfc.nasa.gov> Subject: COSTAR Works but the coproc. has problems (film at 11) To: "starrfie" <starrfie@hydro.la.asu.edu> From: HRS::HRSAKE 8-DEC-1993 21:03:20.91 To: HRSSHORE ! SENT TO @FSM CC: Subj: STScI FSM Report 8 From: STSCIC::DOXSEY 8-DEC-1993 18:50:15.22 To: @SMSTAFF.DIS;12 CC: Subj: good news on COSTAR, not so good on co-processor SM Report #8 5:00 PM December 8 342:22:00 Summary of recent activities: During the day today the STOCC had planned to complete the co-processor functional test, recover the SIs from safe, and run the COSTAR functional test. During the morning they started having a great deal of difficulty getting reliable telemetry data. At first, it appeared that the problem was associated with the communications path between HST and GSFC via the Endeavour. Later it became apparent that the co-processor is interfering in some fashion with the DF224. The nature of the interference seems to be limited to the times when a 32 kbps telemetry format is in use. When the co-processor was powered down all operations returned to normal. The DF224 and co-processor engineers are reviewing the data and trying to determine the source of the problem. The DF224 has 3 internal memory busses, A, B, and C. The co-processor is dually redundant with an A and B sides. The problem has occurred while running with the A buss. The current plan is to safe the SIs and switch from the A to B buss and see if the problem stays or disappears. Meanwhile, after the co-processor was shut down the COSTAR functional test was executed. This test moved the DOB two inches from the launch position and tested the sensors on all the mechanisms. The test was completely successful. There has been much discussion in the last several hours about the plans for tonight's activities. I believe that we will proceed with the reboost as it should not be affected by any changes in the EVA plans. At this time it is not clear whether tonights EVA will proceed as planned, whether there will be any work on the DF224/co-proccessor, or whether they will take a day off to let things settle down and come up with a plan. I have heard suggestions of all three in the last hour or so.
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