Xref: utzoo sci.space:14618 sci.space.shuttle:3775 sci.astro:5466 Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!uwm.edu!gem.mps.ohio-state.edu!usc!henry.jpl.nasa.gov!elroy.jpl.nasa.gov!jato!mars.jpl.nasa.gov!baalke From: baalke@mars.jpl.nasa.gov (Ron Baalke) Newsgroups: sci.space,sci.space.shuttle,sci.astro Subject: Galileo Update Message-ID: <1904@jato.Jpl.Nasa.Gov> Date: 12 Oct 89 23:14:56 GMT Sender: news@jato.Jpl.Nasa.Gov Reply-To: baalke@mars.jpl.nasa.gov (Ron Baalke) Distribution: usa Organization: Jet Propulsion Laboratory, Pasadena, CA. Lines: 71 GALILEO DAILY REPORT 11 OCTOBER 1989 SPECIAL ANNOUNCEMENT: 17 October at 12:57 p.m. EDT is the new launch date for Galileo. General Spacecraft The spacecraft is still in its launch ready state and is being monitored constantly both at KSC and at Pasadena. A PF/R was opened, analyzed, and dispositioned on the attachment of the PRDs (Pressure Release Device) to the RTGs. LCET LCETs #1 and #2 are both being manned around the clock when spacecraft telemetry analysis is in process. Details Spacecraft The spacecraft continues to operate satisfactorily from power supplied by the RTGs. However, temperature control engineering has requested that the orbiter air conditioning to the spacecraft be raised from 52 deg F to 58 deg F. The basis of this request was the RPM temperature which is at its lower acceptable limit as specified in the launch commit criteria. The orbiter temperature was raised as per JPL's request on the evening of 10 October. Appropriate paper is in process that will allow the inlet temperature to be varied from 48 deg F to 60 deg F. This in turn will allow for any future adjustment as a normal operation of the prelaunch activities. As reported on 9 October, during the mating of the PRD (Pressure Release Device) to the RTG two additional washers were installed on each of the four screws used to attach the PRDs to each of the RTGs. Questions were raised on the action taken, that is, the installation of the washers. PF/R 54340 was opened to document the concern expressed by General Electric. Subsequent analysis was made on the overall incident. The primary points were: 1) that during the insertion of the screws the engagement of the screws into the insert locking mechanism was misinterpreted as the screw bottoming out, 2) two washers were added to reduce the gap which in turn reduced the amount of screw engagement in the insert locking mechanism, 3) both JPL and GE engineers agreed that the last one turn into the locking mechanism was required, 4) the JPL technician, that did the hands-on work, and the engineer, that witnessed the work, agreed that two screw turns into the locking element were achieved, 5) that there would be no impact to the mission if one screw backed out. Additional analysis was done at JPL, and after review of the total picture, the Project Manager declared that no further action was necessary; in short, that the attachment of the PRDs to the RTGs was satisfactory. Schedule Discussion and Assessment It was announced this afternoon that the new launch date is 17 October at 12:57 p.m. EDT. The count will be resumed on Monday, 16 October at L-19 hours at 5:57 p.m. EDT. Shortly after the countdown is picked up the IUS is scheduled to be powered for its final prelaunch conditioning and checks. Ron Baalke (818) 541-2341 Jet Propulsion Lab M/S 301-355 4800 Oak Grove Dr. Pasadena, CA 91109