EO1 MISSION READINESS REVIEW

1
EO-1 MISSION READINESS REVIEW

• INDEPENDENT READINESS ASSESSMENT
• Josef A. Wonsever
• October 5, 2000

2
EO-1 MISSION READINESS REVIEWINDEPENDENT
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 8010.1A
• Design Mission Life 1 year
• ALI and Hyperion are Primary Instruments/Technolog
  ies
• 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

3
EO-1 MISSION READINESS REVIEWINDEPENDENT
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 5/6/97 21 Closed
• Critical Design Review 6/25-27/97 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 Closed

4
EO-1 MISSION READINESS REVIEWINDEPENDENT
READINESS ASSESSMENT

• EO-1 Spacecraft/Mission Reviews (continued)
• Review Date RFAs Status
• L-1 Review 1/22/99 28 Closed
• Delta Mission Operations Review 1/28/99
  20 Closed
• Pre-environmental Review 6/10/99
  2316 Closed
• T/V Readiness I/II/III Reviews 9/7-10/1/99
  10 Closed
• Flight Operations Review 11/16-17/99 15 Closed
• Pre-Ship Review 12/15/99 289 Closed
• T/V II Readiness Review 6/12/00 3 Closed
• Delta Pre-Ship Review 8/9-10/00 22
  In Review
• Operations Readiness Review 10/3/00 3 1
  Open

5
EO-1 MISSION READINESS REVIEWINDEPENDENT
READINESS ASSESSMENT

• EO-1 Instrument Reviews - ALI
• Review Date RFAs Status
• Requirements Review 6/7/96 Working Meeting -
  No RFAs
• Design Convergence Review 1/29/97 Working
  Meeting - No RFAs
• Critical Design Review 6/4-5/97 30 Closed
• Pre-Environmental Review 8/5/98 10 Closed
• Pre-Ship Review 1/20/99 5 Closed

6
EO-1 MISSION READINESS REVIEWINDEPENDENT
READINESS ASSESSMENT

• EO-1 Instrument Reviews - HYPERION
• Review Date RFAs Status
• Concept Design Review 8/6/98 47 Closed
• Pre-Environmental Review 4/13/99 16 Closed
• Pre-Ship Review 6/30/99 10 Closed

7
EO-1 MISSION READINESS REVIEWINDEPENDENT
READINESS ASSESSMENT

• Except as noted, All RFAs For EO-1 Reviews Have
  Been Closed
• Remaining Reviews
• Flight Readiness Review 11/9/00
• Launch Readiness Review 11/15/00

8
EO-1 MISSION READINESS REVIEWINDEPENDENT
READINESS ASSESSMENT

• EO-1 RESIDUAL RISK ASSESSMENT
• Issue Residual Risk Mitigation
• Single string design Medium - None
• with complex mission
• EEE Parts level Medium - None
• Grade 3, Some commercial
• WARP - No EM unit,Troubled Medium -
  Successful extended test period
• development/test history

9
EO-1 MISSION READINESS REVIEWINDEPENDENT
READINESS ASSESSMENT

• EO-1 RESIDUAL RISK ASSESSMENT (Continued)
• Issue Residual Risk Mitigation
• AST Startracker - Troubled Medium - Known
  problems have been
• history, DS-1 failure addressed,
• - IMAGE tracker working well
• Project understaffing and Medium - Schedule
  slips have helped
• schedule pressure relieve pressure,
• - Additional temporary staff
• augmentation for part of IT
• Late paperwork closeout Medium - Augmented
  staff helped work
• through large bow wave of paper,
• - Recently paperwork has
• been kept reasonably current

10
EO-1 MISSION READINESS REVIEWINDEPENDENT
READINESS ASSESSMENT

• EO-1 RESIDUAL RISK ASSESSMENT (Continued)
• Issue Residual Risk Mitigation
• Transponder - Late replacement, Low - Passed
  all tests,
• Inconclusive failure analysis - 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 Low - None
• (Very few left from 96)

11
EO-1 MISSION READINESS REVIEWINDEPENDENT
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 Low - Heaters
  added to drive off
• in vacuum contamination,
• - Rate of accumulation appears
• to be decreasing
• Inexperienced prime S/C Low - Close
  relationship with GSFC,
• contractor (Swales) - Some highly experienced
  former
• GSFC personnel on Swales team

12
EO-1 MISSION READINESS REVIEWINDEPENDENT
READINESS ASSESSMENT

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

13
EO-1 MISSION READINESS REVIEWINDEPENDENT
READINESS ASSESSMENT

• EO-1 RESIDUAL RISK ASSESSMENT (Continued)
• Issue Residual Risk Mitigation
• The usual suspects
• Interpoint Converters Low
• Tin Whiskers n/a
• - Thorough review, risk action
• ATC Capacitors Low assessment and
  corrective
• (as appropriate) by Code 562
• Vishay Resistors Low
• Optocouplers Low
• OVERALL ASSESSMENT - MEDIUM RISK MISSION

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EO-1 MISSION READINESS REVIEWINDEPENDENT
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

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EO-1 MISSION READINESS REVIEWINDEPENDENT
READINESS ASSESSMENT

• Recommendation
• Subject to resolution of Sprague capacitor issue
  and closeout of remaining RFAs
• Ready for Final Launch Processing

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EO-1 MISSION READINESS REVIEWINDEPENDENT
READINESS ASSESSMENT

• Backup - Spacecraft/Mission Complexity
• ACS - Three axis stabilized
• Pointing Accuracy 0.022o, Jitter lt5 arcsec, 20
  arcsec instrument alignment
• Star Camera, GPS, Hemispherical Resonator IRUs
• Independent Safehold Processor
• POWER - Deployed, Articulated S/A, 600 w EOL,
  50ah Super NiCad Battery
• PROPULSION - Hydrazine blowdown system with 4
  thrusters _at_ 0.2 lb each
• Formation Flying required (With Landsat-7)
• CDH
• Mongoose V processor _at_12 Mhz, WARP 840Mbps/48Gbit
  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