EO1 MISSION READINESS REVIEW INDEPENDENT READINESS ASSESSMENT Josef

EO-1 MISSION READINESS REVIEW INDEPENDENT READINESS ASSESSMENT Josef A. Wonsever October 5, 2000 Josef A. Wonsever July 19, 2000

EO-1 MISSION READINESS REVIEW INDEPENDENT READINESS ASSESSMENT Review and Mission Assurance Approach • Modified GSFC Independent Review Program Conducted by Code 300 – Spacecraft – Primary Instruments – Mission Operations • EO-1 MAR Imposed for S/C and Instruments – Some compromises for “Better, Faster, Cheaper” approach • EO-1 Ground Rules – – – Technology Demonstration Mission: Would have been Class C per NMI 8010. 1 A Design Mission Life 1 year ALI and Hyperion are Primary Instruments/Technologies X-Band Phased Array technology needed for science downlink AC, LFSA, PPT, CCR, EFF are significantly less important • KSC Responsible for Delta 7320 -10 ELV, including DPAF 2 Josef A. Wonsever October 5, 2000

EO-1 MISSION READINESS REVIEW INDEPENDENT READINESS ASSESSMENT EO-1 Spacecraft/Mission Reviews Review Date RFAs Status S/C Requirements Review 6/7/96 Working Meeting - No RFAs Design Convergence Review 11/21/96 Working Meeting - No RFAs Gnd. Syst. Requirements Review 2/27/97 Working Meeting - No RFAs Confirmation Review 21 Critical Design Review 5/6/97 6/25 -27/97 Closed 40 Closed Mission Operations Review 11/6/97 23 Closed Delta Critical Design Review 9/23/98 18 Closed Delta Confirmation Review 10/14/98 6 3 Closed Josef A. Wonsever October 5, 2000

EO-1 MISSION READINESS REVIEW INDEPENDENT READINESS ASSESSMENT EO-1 Spacecraft/Mission Reviews (continued) Review Date RFAs L-1 Review Status 1/22/99 28 Closed Delta Mission Operations Review 1/28/99 20 Closed Pre-environmental Review 6/10/99 23+16 Closed T/V Readiness I/II/III Reviews 9/7 -10/1/99 Flight Operations Review 11/16 -17/99 Pre-Ship Review 12/15/99 10 15 Closed 28+9 Closed T/V II Readiness Review 6/12/00 3 Delta Pre-Ship Review 8/9 -10/00 22 Operations Readiness Review 10/3/00 4 Closed In Review 3 1 Open Josef A. Wonsever October 5, 2000

EO-1 MISSION READINESS REVIEW INDEPENDENT READINESS ASSESSMENT EO-1 Instrument Reviews - ALI Review Date RFAs Requirements Review Status 6/7/96 Working Meeting - No RFAs Design Convergence Review Critical Design Review 1/29/97 Working Meeting - No RFAs 6/4 -5/97 Pre-Environmental Review 8/5/98 Pre-Ship Review 1/20/99 5 30 10 Closed 5 Josef A. Wonsever October 5, 2000

EO-1 MISSION READINESS REVIEW INDEPENDENT READINESS ASSESSMENT EO-1 Instrument Reviews - HYPERION Review Date RFAs Concept Design Review Status 47 Closed Pre-Environmental Review 4/13/99 16 Closed Pre-Ship Review 8/6/98 6/30/99 10 Closed 6 Josef A. Wonsever October 5, 2000

EO-1 MISSION READINESS REVIEW INDEPENDENT READINESS ASSESSMENT Except as noted, All RFAs For EO-1 Reviews Have Been Closed Remaining Reviews: Flight Readiness Review Launch Readiness Review ~ 11/9/00 ~ 11/15/00 7 Josef A. Wonsever October 5, 2000

EO-1 MISSION READINESS REVIEW INDEPENDENT READINESS ASSESSMENT EO-1 RESIDUAL RISK ASSESSMENT Issue Residual Risk Single string design with complex mission Mitigation Medium - None EEE Parts level Grade 3, Some commercial Medium - None WARP - No EM unit, Troubled development/test history Medium - Successful extended test period 8 Josef A. Wonsever October 5, 2000

EO-1 MISSION READINESS REVIEW INDEPENDENT READINESS ASSESSMENT EO-1 RESIDUAL RISK ASSESSMENT (Continued) Issue Residual Risk Mitigation AST Startracker - Troubled history, DS-1 failure Medium - Known problems have been addressed, - IMAGE tracker working well Project understaffing and schedule pressure Medium - Schedule slips have helped relieve pressure, - Additional temporary staff augmentation for part of I&T Late paperwork closeout Medium - Augmented staff helped work through large bow wave of paper, - Recently paperwork has been kept reasonably current 9 Josef A. Wonsever October 5, 2000

EO-1 MISSION READINESS REVIEW INDEPENDENT READINESS ASSESSMENT EO-1 RESIDUAL RISK ASSESSMENT (Continued) Issue Residual Risk Transponder - Late replacement, Inconclusive failure analysis Low Mitigation - Passed all tests, - Workmanship issues believed not applicable to Triana unit, - Minor ACG spikes probably not related to original EO-1 failure DPAF first flight Low - Thorough Boeing process for new hardware Personnel turnover (Very few left from ‘ 96) Low - None 10 Josef A. Wonsever October 5, 2000

EO-1 MISSION READINESS REVIEW INDEPENDENT READINESS ASSESSMENT EO-1 RESIDUAL RISK ASSESSMENT (Continued) Issue Residual Risk Mitigation IRU - Helium contamination Low - Extensive measures taken to reduce He exposure ALI - Self contamination in vacuum Low - Heaters added to drive off contamination, - Rate of accumulation appears to be decreasing Inexperienced prime S/C contractor (Swales) Low - Close relationship with GSFC, - Some highly experienced former GSFC personnel on Swales team 11 Josef A. Wonsever October 5, 2000

EO-1 MISSION READINESS REVIEW INDEPENDENT READINESS ASSESSMENT EO-1 RESIDUAL RISK ASSESSMENT (Continued) Issue Residual Risk Mitigation Late addition of Hyperion Low (Spring 1998, 1 year delivery, +10% mass, +20% power for S/C) - None Hyperion Cal Lamps - Primary lamps failed, cause unknown - Secondary lamps show lamps no problems so far, - Short on-orbit life requirement, - Cal can be done using moon Sprague Capacitors Very Low tbd - Under investigation 12 Josef A. Wonsever October 5, 2000

EO-1 MISSION READINESS REVIEW INDEPENDENT READINESS ASSESSMENT EO-1 RESIDUAL RISK ASSESSMENT (Continued) Issue Residual Risk Mitigation “The usual suspects”: Interpoint Converters Low Tin Whiskers n/a ATC Capacitors Low Vishay Resistors Low Optocouplers Low - Thorough review, risk action assessment and corrective (as appropriate) by Code 562 OVERALL ASSESSMENT - MEDIUM RISK MISSION 13 Josef A. Wonsever October 5, 2000

EO-1 MISSION READINESS REVIEW INDEPENDENT READINESS ASSESSMENT Safety • No Open Issues for EO-1 • Routine Verification Tracking Log items remain to be worked as planned NOTE: SAC-C safety data package overdue 14 Josef A. Wonsever October 5, 2000

EO-1 MISSION READINESS REVIEW INDEPENDENT READINESS ASSESSMENT Recommendation Subject to resolution of Sprague capacitor issue and closeout of remaining RFAs: Ready for Final Launch Processing 15 Josef A. Wonsever October 5, 2000

EO-1 MISSION READINESS REVIEW INDEPENDENT READINESS ASSESSMENT Backup - Spacecraft/Mission Complexity • ACS - Three axis stabilized – Pointing Accuracy 0. 022 o, Jitter <5 arcsec, 20 arcsec instrument alignment – Star Camera, GPS, Hemispherical Resonator IRUs – Independent Safehold Processor • POWER - Deployed, Articulated S/A, 600 w EOL, 50 ah Super Ni. Cad Battery • PROPULSION - Hydrazine blowdown system with 4 thrusters @ 0. 2 lb each – Formation Flying required (With Landsat-7) • C&DH – Mongoose V processor @12 Mhz, WARP 840 Mbps/48 Gbit processor/recorder – 1773 Fiber optic data bus – X-Band Phased Array, 105 Mbps Science, S-Band, 2 Mbps Housekeeping • INSTRUMENTATION – 2 Primary Instruments, numerous secondary instruments/technologies 16 Josef A. Wonsever October 5, 2000