yee@trident.arc.nasa.gov (Peter E. Yee) (04/12/90)
STS-31/HST SCRUB TURNAROUND STATUS Wednesday, April 11, 1990 - 3:00 p.m. EDT NASA and contractor personnel continue processing of Space Shuttle Discovery and the Hubble Space Telescope following the launch scrub of the STS-31 mission at 8:46 a.m. EDT yesterday. No new launch date has been determined. Launch delay estimates continue to be approximately 7-14 days. Engineers are looking at both APU #1 and its controller as part of their efforts to determine the cause of yesterday's problem. All indications point to a problem in the APU but the controller will be checked to assure it is not the problem. Procedures for APU removal and options for recharge of the HST batteries are being reviewed. Immediate processing work will involve extending the Rotating Service Structure, installing access platforms and removal of the controller for APU #1. The controller will be sent to the contractor to verify that it did not cause the intermittent chamber pressure indication. The decisions on whether or not to remove and replace the APU and the procedures for HST battery recharge are expected either late tomorrow or Friday.