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STARDUST Project CRITICAL EVENTS READINESS REVIEW COMET P/WILD 2 ENCOUNTER ISA Status Charles Love

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STARDUST Project CRITICAL EVENTS READINESS REVIEW COMET P/WILD 2 ENCOUNTER ISA Status Charles Love. JPL: 303-411 AM / 301-427 PM LMA: MSA +1 818 354-1275 08:00 AM - 05:00 PM PST 20 Nov 2003. ISA SUMMARY. Total ISA’s 196

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Presentation Transcript
slide1

STARDUST Project

CRITICAL EVENTS READINESS REVIEW

COMET P/WILD 2 ENCOUNTER

ISA Status

Charles Love

JPL: 303-411 AM / 301-427 PM

LMA: MSA

+1 818 354-1275

08:00 AM - 05:00 PM PST

20 Nov 2003

CERR - Charles Love

slide2

ISA SUMMARY

  • Total ISA’s 196
    • Crit 1: Represents High Effect on Achieving Full Mission Success.
      • 5 Total - All Closed, None Impact Successful Encounter
        • FSW Corrections Identified for 4 to Preclude Recurrence of Issue
        • 1 Documents NAVCAM Contamination Issue
    • Crit 2: Represents Significant Effect on Achieving Full Mission Success.
      • 56 Total - 55 Closed, None Impact Successful Encounter
      • Z82232, Safe Mode Entry on 10/22/03
        • Spacecraft Successfully Recovered per SM Recovery Procedure
        • Cause Investigation Continuing
        • Rapid SM Recovery Possible Up To E–17 Hours
    • Crit 3 & 4: Represents No Significant or No Effect on Achieving Full Mission Success.
      • 135 Total - 134 Closed, None Impact Successful Encounter
      • Z82341, NAVCAM Cal Lamp Inoperable
        • No Impact to Mission Objectives
        • Shutter Operation Verified
        • Cause Investigation Continuing

CERR - Charles Love

slide3

ISA SUMMARY (Continued)

  • ISA’s With Possible Wild 2 Encounter Ramifications
    • SSPA 3dB Power Drop (Z70033, Z50509, Z50525)
      • Data Rates Adjusted to Account for Power Decrease
      • Sufficient Link Margin Exists for Comm Through MGA and No Additional Degradation in SSPA Performance Noted. (Trending Continues)
    • PACI Resets (Z69809)
      • FSW Patch Installed to Monitor & Account for Internal Resets
      • Temperature Range of Concern will not be Breeched During Encounter
    • Safe Mode Entry November 2000 (Z70478)
      • Most Likely Caused by a Large Solar Flare Resulting in a Star Camera Outage or SEU
      • Solar Flare Contingency Plan Previously Considered, However, Risk of Plan Action (Due to an Imminent Solar Flare Hit) Potentially Greater than Doing Nothing
    • LGA 2 Antenna Pattern Dead Zone (Z51876, Z51353)
      • Represents a 3dB to 6dB Loss in Performance
      • Sufficient Uplink Margin Exists and No Additional Degradation in Performance Noted

CERR - Charles Love

slide4

ISA SUMMARY (Continued)

  • ISA’s with Possible Wild 2 Encounter Ramifications (Continued)
    • Limited Dust Flux Monitor Operation Time (Z50845)
      • Most Likely Cause Attributed to Internal Power Circuitry
      • Planned Operation at Encounter Limited to ~33 Minutes
    • Unexpected NAVCAM Mirror Offset (Z78279)
      • Caused by Large Attitude Knowledge Errors Due to Rate Biases
      • Mitigation Technique (Enabling Star Camera Processing Post Slew) not Possible at Encounter
      • Risk of Losing Closest Approach Images Accepted by Project Since No Other Workarounds are Possible
    • Stuck Filter Wheel (Z71028)
      • Cause is Unknown
      • Commanding Suspended Since Filter is Stuck in a Favorable Position
    • LOS LOCK Errors Result in Uplinks Not Being Received (Z78164, Z71700, Z70268, Z71803, Z71942, Z75486)
      • Operational Workaround In Place (NOOP is Sent Prior to Every Uplink Session)
      • FSW Patch to Correct this Nuisance was Rejected Since STL Verification of Patch Performance is not Possible

CERR - Charles Love

slide5

OTHER ANOMALIES

  • Red Flag Problem/Failure Reports (6 of 69 Total P/FRs)
    • All Resolved Pre-Launch (Reworked, Replaced or Repaired)
    • No Recurrences of Any Related Failures In Flight
  • Unverified Failures (5 Total UVFs)
    • All Resolved Pre-Launch (Replaced or Designated Non-Critical to Mission)
    • No Recurrences of Any Related Failures In Flight
  • EEPROM Single Bit Failures on Genesis Spacecraft C&DH
    • Has Occurred Twice on Genesis but Never on Stardust
    • Cause Attributed to “Weak Cells” Due to Process-Induced Defective Cells or Poorly Programmed Cells
    • Genesis Implemented Contingency Process to Maintain Side-A Reboot Capability (Overwriting EEPROM via FSW Patch)
    • Similar Process Could be Applied to Stardust Should it Occur
    • Stardust EEPROM Image Monitored Each Week

CERR - Charles Love

slide6

SINGLE POINT FAILURES & WAIVERS

  • All Approved Pre-Launch
  • No Failures Nor Degradation of Performance Detected During 4.7 Years of Flight
  • Single Point Failures Include:
    • “Standard”
      • Structure, Cables, Connectors, Passive RF, Prop Tanks and Lines, Thermal Blankets
    • Coax Transfer Switch
      • Failure at “In Between” Position
      • Unlikely Due to Heritage Experience
    • Single Prop Filter
      • Order of Magnitude Design Margin
    • Single Battery
      • Single Cell Short Failure Tolerant
      • Extensive Flight and Test Data Indicates Minimal Risk of Cell Open Failure
    • Pyro Initiation Unit FPGA
      • Low Risk Due to Radiation Tolerance vs. Total Dose
  • Fifty (50) Total Waivers
    • 18 Major (Class 1) Waivers Against Contract Requirements Documents, ICDs, Etc.
    • 32 Minor (Class 2) Waivers Against Internal LMA or Stardust Derived Documents
  • No Single Point Failure Items or Waivers Impact Successful Encounter

CERR - Charles Love

slide7

READINESS ASSESSMENT

  • Stardust Encounter is Ready to Proceed
    • Risks have been Identified, Evaluated, Mitigated and Accepted
    • All ISAs Are Sufficiently Understood and/or Mitigated
    • All Red Flag PFRs Are Closed
    • All UVFs Are Closed
    • All Single Point Failures have been Identified, Evaluated and Accepted
    • All Waivers have been Identified, Evaluated and Accepted
    • No Waivers to Flight Rules and Constraints for Encounter
    • Encounter Test Program and Anomalies Well Documented and Completion On Track

CERR - Charles Love

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