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


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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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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

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


Stardust project critical events readiness review comet p wild 2 encounter isa status charles love

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


Stardust project critical events readiness review comet p wild 2 encounter isa status charles love

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


Stardust project critical events readiness review comet p wild 2 encounter isa status charles love

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


Stardust project critical events readiness review comet p wild 2 encounter isa status charles love

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


Stardust project critical events readiness review comet p wild 2 encounter isa status charles love

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


Stardust project critical events readiness review comet p wild 2 encounter isa status charles love

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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