# Presentation: 111086

## 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

- 20 Nov 2003

## 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**

***ISA SUMMARY***

- CERR - Charles Love

- 20 Nov 2003

## 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**

***ISA SUMMARY  (Continued)***

- CERR - Charles Love

- 20 Nov 2003

## 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**

***ISA SUMMARY  (Continued)***

- CERR - Charles Love

- 20 Nov 2003

## OTHER ANOMALIES

***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

- 20 Nov 2003

## SINGLE POINT FAILURES & WAIVERS

***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

- 20 Nov 2003

## READINESS ASSESSMENT

***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

- 20 Nov 2003