# Presentation: 741829

## MONTHLY STATUS REVIEW 

**MONTHLY STATUS REVIEW**** **
**EOS ICE, CLOUD & LAND ELEVATION**
** ****SATELLITE (ICESat) PROJECT**
**Code 425**
**UPN 227-6**
**   ****	****   ****Project Scientist:                          Dr. J. Zwally**** ****/**** ****971**
**	****   ****Project Manager:                          James Watzin**** ****/**** ****425**
**	****   ****Deputy Project Manager:             Gregory Smith**** ****/**** ****425**
**	****   ****DPM**** ****/**** ****Resources:                          Linda Greenslade**** ****/**** ****425**
**	****   ****Instrument Development:            Ron Follas**** ****/**** ****556**
**	****   ****Instrument Scientist****	****	****       Dr. J. Abshire**** ****/**** ****924**
**	****   ****Ground System Development:    ESDIS**** ****/**** ****423**
**	****   ****Spacecraft Contractor:                 Ball**

**March 11, 2002**

## ICESat PROJECT SUMMARY

**ICESat PROJECT SUMMARY**
**STATUS AS OF:  2**** ****/**** ****28**** ****/**** ****02**

_**LEGEND**_

**Good Shape**

**Minor Problem**

**Major Problem**

**Program Management**

**Subcontracts**

**Spacecraft I&T**

**Observatory I&T**

**Subsystems**

**Systems Engineering**

**R&D Budget**

**Procurement**

**Workforce**

**Travel**

**Launch Vehicle**

**Launch Site (VAFB)**

**Ground SYS**** ****/**** ****OPS (EOS)**

**GLAS**

**Technical         Cost          Schedule        Overall**

** ****DEC   JAN  FEB**

**Spacecraft Bus:**

**Prime**

**Major Interfaces**

**Resources**

**Instruments**

**Business**

**Science**** ****/**** ****Operations**

**Summary Assessment**

**Y**

**R**

**R**
**G**
**G**
**G**

**Y**

**JPL GPS Receivers**

**G**
**G**
**G**
**G**

**G**
**G**
**G**
**G**

**G**
**G**
**G**
**G**

**GLAS**

**Y**

**Y**

**R**

**Y**

**G**
**G**
**G**
**G**
**G**
**G**

** ****DEC    JAN  FEB**

** ****DEC   JAN   FEB**

** ****DEC   JAN   FEB**

** ****DEC   JAN    FEB**

**  ****DEC   JAN   FEB**

**G**
**G**
**G**
**G**
**G**
**G**

**R**
**G**
**G**
**G**

**R**
**G**
**G**
**G**

**G**

**G**

**G**

**R**
**G**
**G**
**G**

**R**
**G**
**G**
**G**

**R**

**R**

**G**

**G**
**G**
**G**
**G**
**G**
**G**

**R**
**G**
**G**
**G**

## SCHEDULE

**Codes 400 and 500 are discussing ways to contain this problem**
**Expedite thermal performance evaluation of optical system**
**Conduct overall ICESat development and personnel assessment. **
**Develop revised mission schedule**

**CURRENT STATUS**
**Working hard to preserve October-December 2002 LRD.**
**Developed new GLAS I&T schedule that includes laser rework and early EMI test resulting in minimal schedule impact.  Aggressively working all I&T issues.  Optimizing remaining mission schedule.**
_**GLAS on proposed re-plan schedule for June 17 delivery and subsequent 12/16 LRD.  Schedule to be presented to HQ**__** **__**/**__** **__**Code Y in mid-March.**_

**SCHEDULE**
**STATUS AS OF:   2/28/02**

**       ****PROBLEM**** ****/**** ****ISSUES          PROGRAMMATIC IMPACT                        ACTION**

**R**

**Latest GLAS completion schedule causes impact to LRD.**

**GLAS component rework cycles continue to erode GLAS integration and test schedule; longer GLAS integration effort needed**
**GLAS CPT only partially completed.  Some problems under investigation.  Instrument scientists struggling to interpret the data.**

**          ****DATE**
**   ****ESTAB  COMPL**
**  ****10**** ****/**** ****15     11**** ****/**** ****1**
**      ****Closed**
**   ****10**** ****/**** ****15   11**** ****/**** ****30**
**  ****Test removed**
**   ****issue closed**
**   ****11**** ****/**** ****15  1**** ****/**** ****30**
**       ****Closed**
**   ****11/15    2/15**
**     **_**Complete**_

## GLAS I&T PROBLEMS IN WORK

**Laser S/N 001 failed during instrument integration operations**

**CURRENT STATUS**
**Fault traced to a failed amplifier diode array assembly, amplifier module replaced.**
**Subsequent capacitor failure during vibration test revealed deficient design of electronics board.  Design modification options in development.**
**Decision made to replace existing board in each laser with new boards.**
_**Board replacement is progressing as planned - CLOSED**_

**GLAS I&T PROBLEMS IN WORK**
**LASERS**
**STATUS AS OF:   2/28/02**

**       ****PROBLEM/ISSUES            PROGRAMMATIC IMPACT                        ACTION**

**          ****DATE**
**   ****ESTAB  COMPL**
**    ****11/29    2/15**
**    ****1/28     3/15**

**G**

**Loss of 1/3 of instrument lifetime.**
**Initial estimate is 2-3 month impact to GLAS integration and delivery schedule**

**Replace amplifier stage.**
**Replace electronics board in all 3 lasers**

## GLAS I&T PROBLEMS IN WORK

**GLAS boresite stability does not meet mission performance requirements**** **

**CURRENT STATUS**
**Peer Review held**
**Retest conducted; preliminary results look favorable with major errors traceable to set-up issues.  Detailed data analysis results look promising.**
**Additional analysis initiated on the telescope assembly.**
**Test plan defined.**
_**Plan in place to validate; requires completion of environmental test program.**_

**GLAS I&T PROBLEMS IN WORK**
**OPTICAL PATH**
**STATUS AS OF:   2/28/02**

**       ****PROBLEM/ISSUES            PROGRAMMATIC IMPACT                        ACTION**

**          ****DATE**
**   ****ESTAB  COMPL**
**    ****11/30    **_**6/15**_
**      **

**Y**

**Fundamental measurements may be compromised if behavior persists on orbit.**

**Hold mini-peer review on calibration results**
**Get AETD and systems involvement in development of troubleshooting plan.**

## GLAS I&T PROBLEMS IN WORK

**Intermittent energy monitor on green laser**

**CURRENT STATUS**
**Several troubleshooting tests conducted, inconclusive results.**
**Alternate Etalon operation algorithms in development.**
**Problem understood and board modification solution verified on the engineering model board.  Alternative (baseline) software approaches being investigated and validated.**
_**Software fix to be validated in T**__** **__**/**__** **__**V testing**_

**GLAS I&T PROBLEMS IN WORK**
**LIDAR OPERATION**
**STATUS AS OF:   2/28/02**

**       ****PROBLEM/ISSUES            PROGRAMMATIC IMPACT                        ACTION**

**          ****DATE**
**   ****ESTAB  COMPL**
**   ****12/17    **_**6/15**_
**     **

**Y**

**Potential compromise on Etalon operation and data reduction**

**Investigate root cause**
**Investigate alternate means for Etalon operation and data reduction**

## COST

**CURRENT STATUS**
_**Schedule and cost requirements ready to be presented to HQ**__** **__**/**__** **__**Code Y in mid-March.**_

**COST**
**STATUS AS OF:   2/28/02**

**       ****PROBLEM**** ****/**** ****ISSUES          PROGRAMMATIC IMPACT                        ACTION**

**          ****DATE**
**   ****ESTAB  COMPL**
**    ****7/**** ****01    11/15**
**     ****Complete**
**  ****11**** ****/**** ****01    2/28**
**     **_**Complete**_

**R**

**Cannot meet late 2002 LRD without additional funding.**
**Potential additional cost and schedule impact to late 2002 LRD**

**ICESat is unfunded beyond 5**** ****/**** ****31**** ****/**** ****02**
**Cost**** ****/**** ****schedule impact of SN001 Laser and other anomalies**

**Present overguide requirements to Code Y.**
**Generate cost**** ****/**** ****schedule impacts**

## PMC ACTION STATUS

_**NONE**_

**PMC ACTION STATUS**

_**Data**__** **__**/**__** **__**Source**_

_**Status**_

**STATUS AS OF:   2/28/02**

## IT SECURITY

**	****Management****	****IT Security****	****Contingency****	****Agency****	****Number****	****Authorization**
_**Element**_**	**_**Plan**_**	**_**Plan**_** ****	**_**Plan**_**	**_**Check**_**	**_**People**_**	**_**To Proceed**_
**Ball / LASP****	****Complete****	****Complete****	****Complete****	****To Center ****	****22****	****Pending**
**	****	****	****	****Security**
**ISIPS / ISF****	****Final Pending****	****Final Pending****	****Final Pending****	****To be****	****18*****	****N**** ****/**** ****A**
**(GSFC Bldg 22)****	****	****	****	**** Re-assessed**
***Number increased significantly due to changes in IT security requirement to include data handling personnel.  Forms have been submitted and fingerprinting is in progress.**

**IT SECURITY**

**STATUS AS OF:   2/28/02**

## ICESat SIGNIFICANT PROGRESS

**ICESat SIGNIFICANT PROGRESS**

**STATUS AS OF:   2/28/02**

**GLAS PER WAS SUCCESSFULLY COMPLETED ON FEBRUARY 28, 2002.  A FEW MINOR RFAS WERE WRITTEN, BUT NO MAJOR ISSUES.  CONGRATULATIONS TO THE GLAS TEAM FOR MEETING THIS MAJOR MILESTONE.**
**POWER SUPPLY BOARD REPLACEMENT IN THE GLAS LASERS IS COMPLETE (1 WEEK EARLY).  KUDOS TO THE REWORK TEAM!**
**CONDUCTED THE FIRST ON-INSTRUMENT TESTS OF THE MINI-TARGET. TEST RESULTS WERE GOOD.**
**COMPLETED ANOTHER SUCCESSFUL TEST BETWEEN BALL INSTRUMENT TEST OPERATIONS CONSOLE (ITOC) AND THE GLAS INSTRUMENT.  ALL CURRENTLY IMPLEMENTED COMMANDS AND TELEMETRY WERE EXERCISED, MECHANISMS WERE ACTIVATED, INSTRUMENT WAS POWERED ON, INITIALIZED AND THE ETU LASER WAS FIRED.**

## ICESat SIGNIFICANT PROGRESS

**ICESat SIGNIFICANT PROGRESS**

**STATUS AS OF:   2/28/02**

**INSTALLATION OF HEATERS ON UPPER DECK OF THE SPACECRAFT IS IN PROGRESS.  THIS MODIFICATION WILL MINIMIZE THERMAL INDUCED DEFORMATIONS OF THE SPACECRAFT TO GLAS INTERFACE IN ORDER TO HELP MAINTAIN THE INSTRUMENT BORESITE ALIGNMENT.**
**THE NASA FLIGHT PLANNING BOARD HAS MOVED THE ICESAT LAUNCH DATE TO NO EARLIER THAN 12**** ****/**** ****15**** ****/**** ****02.**
**CURRENT STATUS:**
**GLAS ON THE PROPOSED RE-PLAN SCHEDULE FOR JUNE 17 DELIVERY**
**ICESat ON THE PROPOSED RE-PLAN SCHEDULE FOR **
**	****DECEMBER 16 LRD**

## BACK UP

## SPACECRAFT FLIGHT HARDWARE STATUS

**SPACECRAFT FLIGHT HARDWARE STATUS**
**ICESat PROJECT                                                                                                                     STATUS AS OF:  2/28/02**

**ACS / ACTUATORS**

**MIC**

**EIC**

**ENV**

**RWA**

**TORQR  RODS**

**Legend:**

**C&DH**

**MIC**

**ENV**

**CTU**

**PEC**

**DBC**

**SCC**

**SEP**

**SSR**

**EIC**

**EPS**

**MIC**

**EIC**

**FUNCT**

**ENV**

**TEST**
**BATT**

**PCU**

**ARRAY PANELS**

**SADA **

**SADE**

**CTV**

**ETM**
**GPS**

**GLAS**
**SIM**

**EM**
**IST/LRS**

**GSE**

**ITOC**
**(GSFC)**

**HRNSS**

**OTHER**

**PAF**

**LRA**

**THRML**
**RAD**

**FLIGHT**
**BATT**

**FSW**

**FLT**
**PAF**

**PROP**
**MOD**

**FLT**
**SIRU**

**STRUCT**

**COMM**

**MIC**

**ENV**

**ZENITH**
**ANT**

**X-BAND**
**XPNDR**

**NADIR**
**ANT**

**RF  FILTER**

**FUNCT**

**ACS SENSORS**

**STAR TRKR**

**SUN SENSORS**

**SUN SENSORS**

**MAGNETOMETERS**

**MIC**

**EIC**

**FUNCT**

**EIC**

**FSWTB**

**FUNCT**

**ENV**

**Lost lock once during test  – connector repair to be verified in T/V**
**Possible VIA problem on PWBs - spare boards in analysis at GSFC**
**Adding ability to reset “stuck” DSU during planned thermal rework**
**Adding thermal control circuits for more stable GLAS interface**

**FUNCT**

**No Problems**
**Minor Problems**
**Major Problems**
**Complete/Delivered**
**Integration Complete**
**GLAS Mounting**

**PDA**

**SUN SENSORS**
**          ****(G)    (G)    (G)     (G)**

**GPS**

**S-BAND**
**XPNDR**

- 1

**(G)**

- 2

- 4

- 3

## INSTRUMENT STATUS

**OPTICS**

**RECEIVER SYSTEM**

**TELESCOPE**

** ****TRANSMITTER SYSTEM**

**FIBER OPTIC SYSTEM**

**LASER**
**(816nm)**
**OTS**

**LED**
**(532nm)**
**OTS**

**FIBER**
**OPTICS**

**GROUND**
**TEST**
**PICKOFF**
**ASSY**

**BENCH CHECKOUT EQUIPMENT**

**TARGETS -**
**MAIN/MINI/SRS**

**NTGSE**

**CONTROL-**
**LERS**

**WORK-**
**STATIONS**

**No Problems**

**Minor Problems**

**Major Problems**

**Legend:**

**ELECTRONICS**

**MAIN**
**ELECT**
**UNIT**

**HIGH**
**VOLTAGE**
**PWR SUPPLY**

**POWER**
**DISTRIB**
**UNIT**

**HARNESSING**

**LIDAR SYSTEM**

**ETALON**

**LBSM**

**BEAM-SPLITTER**
**ASSY**

**SPCMs**

**THERMAL CONTROL SYSTEM**

**CONSTANT**
**CONDUCT**
**HEAT PIPES**

**LOOP HEAT PIPES/**
**RADIATORS**

**BLANKETING**

**HEATERS/**
**INSTRUMENTATION**

**ALTIMETRY**
**TOWER**

**STELLAR REFERENCE SYSTEM**

**LASER**
**REF**
**TELESCOPE**

**ROSI**
**STAR**
**TRACKER**

**COLLIMATED**
**REF**
**SOURCE**

**LASER**
**REF**
**SENSOR**

**LASER**
**PROFILING**
**ARRAY**

**GYRO**

**HARNESSING**

**LATERAL**
**TRANSFER**
**RETROs**

**L**
**S**
**M**

**L**
**S**
**M**

**LASER**

**LASER**

**TEST SYSTEMS -**
**ALTIMETER/LIDAR/**
**GPS**

**INSTRUMENT STATUS**
**ICESat Project                                                                                                                                  Status as of 2/28/02****	****	****	****	****	****	**

**LASER**

## ICESat PROJECT

**ICESat PROJECT**
**OUTSTANDING PROPOSALS STATUS**

_**Contract Number**_**:  NONE**
_**Contractor**_**:  **
_**Technical Officer**_**:  **
_**Contract Officer**__** **__**/**__** **__**Specialist**_**:  **
_**Type Action**_**:  **
_**In-house Estimate**_**:  **
_**Proposed Value**_**:  **
_**Proposal Date**_**:  **
_**Technical Completion**_
**	****Plan:  **
**	****Actual:  **
_**Award Date**_
**	****Plan:  **
**	****Actual:  **

**STATUS AS OF:   2/28/02**

## END OF MISSION PLAN DEVELOPMENT

**END OF MISSION PLAN DEVELOPMENT**
**COMPLETED**

_**Final Estimate**_**:  **
**	****Final Orbital Debris Generation report was approved by Headquarters on 4**** ****/**** ****9**** ****/**** ****01.  The total mission package included ICESat, CATSAT, DPAF, and launch vehicle.  Both ICESat and CATSAT meet the 8m****2**** guideline by significant margins.  ICESat is 3.9m****2**** and CATSAT 0.9m****2****.  ICESat will reenter in 15 years, which is well under the 25 year guideline.**
**	**
_**Disposal Option Assessment**_
**	**_**Controlled Reentry**_**:  Not practical -- +240kg additional fuel and 6 months delay**
**	**_**Safe Orbit**_**:  Not feasible -- same as re-entry**
**	**_**Shuttle Recovery**_**:  ICESat polar orbit not accessible to the shuttle; also spacecraft design not manned-flight rated**
**Expect no changes when CHIPSAT data becomes available**

**STATUS AS OF:   2/28/02**

## UNDER REVIEW

**ICESat MASTER SCHEDULE**** **

**99**

**00**

**01**

**02**

**C **

**Y**

**SPACECRAFT**

**PROJECT/ELEMENT**

**SCIENCE/ISIPS**
**GSFC CODE 900**

**ESDIS GROUND**
**SYSTEM + **
**OPERATIONS **

**Status As Of**

**2/28/02**

**1**

**2**

**BALL AEROSPACE**

**REVIEWS**

**GLAS INSTRUMENT**

**GSFC CODE 900**

**APPVL RESP**

**ACCOMP RESP**

**C. SCOLESE**

**J. DEZIO**

**GSFC**

**3**

**4**

**LAUNCH VEHICLE**
**DELTA 7320**

**CONTROL CENTER/FOT**
**BALL AEROSPACE**

**MOR**

**PER**

**LRD**

**Environmental Testing**

**Box, Pack, and Ship**

**Launch Operations**

**GLAS I+T**

**FOR**

**PSR**

**LRR**

**ACDS**
**+ Prop**

**S/As**

**Drill **

**Template**

**Final **

**ATBDs**

**Review ATBDs**

**Oral **

**Reviews**

**Report**

**MOWG 2 **

**NSIDC **

**CDR**

**#1**

**Flt Lasers 2 + 3**

**Beta**
**Version **

**Version #1**

**SCF Launch Ready**

**E-T-E**
**Test **

**EDOS **

**Vac**
**Test **

**CTV **

**Award**

**Award **

**Development**

**Procure.’s, Fab, Assy, + Test**

**ISF **

**AGS****NGS**

**GRD**
**ORR **

**30 Day**
**C/O **

**GLAS**
**C/O **

**FDS**
**PDR **

**Cmd/Tlm**
**  ****Test**

**Sim + Dress**
**Rehearsals **

**Fabrication**

**MRR**

**FRR**

**ORR **

**3**

**   ****Design/Development/Integrate/Test**

** ****Time Now**

**Avionics and Harness In-House**

**SIPS CDR**

**SIPS**
**Version #1**

**SIPS**
**H/W**

**SIPS**
**Version #2**

**Manufacturing , Assembly, and  Test**

**Ctrl Computers**

**Struct.**

**Final**
**MORD**

**Flt **

**Tele**

**   ****Design/Development/Integrate/Test**

**MOR**

**Start 2nd Stage **

**DPAF (C)          **

**CCAS**
**DMCO**

**LOX**
**Tanks (C) **

**LOX Tanks (S) **

**S/C Fit Check **

**DPAF Assy/Mfgr (S) **

**Complete 2nd Stage **

** ****Fuel Tanks (S) **

**Fuel **
**Tanks (C) **

**S/S Deliveries**

**PWR**

** ****C&DH + COM**

**Draft**
**IGS**
**Test**
**Plan **

**Original GLAS Delv.**

**Final IGS**
**Test Plan **

**LRD 10/31**

**Flt Laser **

**Delv **

**Bus Qual w/Instr Mass Model**
**and Elec I/F C/O w/Simulators**

**+2 Weeks Reserve**

**Subsystem I+T**

**PER 12/15**

**Assy + Test**

**Delivery and Launch Operations**

**SIPS**
**Version #3**

**FOT Training**

**Slip Delv to 4/30**

**(Proposed)**

**+1 week reserve**

**UNDER REVIEW**

## SCHEDULE SLACK OVERVIEW

**GLAS INSTRUMENT****	****CODE 500****	****	**** ****	**
**S/C BUS**** ****	****BALL****	****	**** ****	**
**	****	****	****	**
**OBSERVATORY I&T ****	****BALL ****	**** ****	**** ****	**
**AND LAUNCH**
**NOTES:**

**SCHEDULE SLACK OVERVIEW**

**STATUS AS OF:   2/28/02**

**UNDER REVIEW**

## SCHEDULE SLACK HISTORY

**EVALUATED TURNING MIRROR SCRATCH**
**REPEATED WORKMANSHIP VIBRATION OF LSM-2**

**12**
** ****8**
** ****4**
** ****0**

**W**
**E**
**E**
**K**
**S**

**4/00              1/01                    1/02                   1/03**

**LRD CHANGE TO 12**** ****/**** ****15**** ****/**** ****01**

**4 WEEKS TO GLAS FOR I&T & COMPONENT PROBLEM RESOLUTION**

**11 WEEKS**
**TOTAL PROGRAM**

**SCHEDULE SLACK HISTORY**

**STATUS AS OF:   2/28/02**

**REWORK  OF HEAT PIPES, SPCMS, LASER ADJUSTMENT AND DC**** ****/**** ****DC CONVERTERS**

**ASSUMES GLAS DELIVERY DATE OF 12/1/01 AND 6/1/02 LRD**

**LATE SRS AND OTHER COMPONENT DELIVERIES TO I&T**

**FLIGHT E-BOX INDUCTOR REPAIR**

**OPTICAL STABILITY AND E-BOX REWORK**

**INSTALLATION OF INVAR COUNTER WEIGHTS ON LSM’S**

**-4 WEEKS SLACK**

**6/01 LRD**

**12/15/01 LRD**

**10/31/02 LRD PROPOSED**

**GLAS AETD SCHEDULE REBASELINE AND PROPOSED 10/31/02 LRD**

**SCHEDULE UNDER REVIEW**

## ACRONYMS

**ACRONYMS**

**AFT - (GLAS aft optics)**
**AGS - Alaska Ground Station**
**ANT - Antenna**
**ARO - After Receipt of Order**
**ATP - Authority to Proceed**
**CCAS – Cape Canaveral Air Station**
**CM – Center of Mass**
**CPT- Comprehensive Performance Test**
**CTU - Command and Telemetry Unit**
**DBC - Data Bus Coupler**
**DO – Delivery Order**
**DSU - Data Storage Unit**
**EAC – Estimate at Completion**
**E-BOX - Electronics Box (= MEU)**
**EDAC - Error Detection and Correction**
**EIC - Electrical Integration Complete**
**ENV - Environment or Environmental**
**EPS - Electrical Power Subsystem**
**FOR - Flight Operations Review**
**FOT - Flight Operations Team**

**FRR - Flight Readiness Review**
**FSW - Flight Software**
**FSWTB - Flight Software Test Bench**
**HRG - Hemispherical Resonating Gyro**
**HVPS – High Voltage Power Supply**
**IGS - ICESat Ground System**
**IIRR – Instrument Integration Readiness Review**
**IRU - Inertial Reference Units**
**ISF - Instrument Science Facility**
**I-SIPS - ICESat Science Investigator-Led Processing **
**IST - Instrument Star Tracker**
**ITOC - Instrument Test Operations Center**
**LASP - Laboratory for Atmospheric & Space Physics**
**LED – Light-Emitting Diode**
**LHP - Loop Heat Pipe **
**LPA – Laser Profiling Array**
**LRA - Laser Retro-Reflector Assembly**
**LRD - Launch Readiness Date**
**LRR - Launch Readiness Review**
**LRS - Laser Reference System**

**STATUS AS OF:   2/28/02**

## ACRONYMS

**ACRONYMS**

**LSM - Laser Steering Mechanism**
**MEU - Main Electronics Unit**
**MIC - Mechanical Integration Complete**
**MIWG - Mission Integration Working Group**
**MOC - Mission Operations Center**
**MOR - Mission Operations Review**
**MORD - Mission Operations Requirements Doc.**
**MOWG - Mission Operations Working Group**
**MPS - Multi-program Support**
**MRR - Mission Readiness Review**
**NADIR – Earth-facing side of spacecraft**
**NGS - Norway Ground Station**
**NISN - NASA Integrated Services Network**
**NSIDC - National Snow and Ice Data Center**
**NTGSE - (Windows) NT Ground Support Equip**
**ORR - Operational Readiness Review**
**OTS - Optical Test Source**
**PDA - Power Distribution Assembly**
**PDU – Power Distribution Unit**
**PEC - Precise External Clock**

**PRA – Probabilistic Risk Assessment**
**RWA – Reaction Wheel Assembly**
**S**** ****/**** ****A - Solar Array**
**SADA – Solar Array Drive Assembly**
**SADE – Solar Array Drive Electronics**
**SCC - Spacecraft Control Computer**
**SEP - Spacecraft Electronics Package**
**SIPS – Science Investigator-Led Processing System**
**SIRU - Space Inertial Reference Unit**
**SLTC – Space Lidar Technical Center**
**SM - Safe Mode**
**SORD - Systems Operations Requirements Document**
**SPCM - Single Photon Counting Module**
**SRS – Stellar Reference System**

**STATUS AS OF:   2/28/02**

## PROJECT OVERVIEW

**PROJECT OVERVIEW**

**ICESat**
_**SIGNIFICANT PROGRESS**_
**GLAS PER WAS SUCCESSFULLY COMPLETED ON FEBRUARY 28, 2002.  A FEW MINOR RFAS WERE WRITTEN, BUT NO MAJOR ISSUES.  CONGRATULATIONS TO THE GLAS TEAM FOR MEETING THIS MAJOR MILESTONE.**
**POWER SUPPLY BOARD REPLACEMENT IN THE GLAS LASERS IS COMPLETE (1 WEEK EARLY).  KUDOS TO THE REWORK TEAM!**
**CONDUCTED THE FIRST ON-INSTRUMENT TESTS OF THE MINI-TARGET. TEST RESULTS WERE GOOD.**
**COMPLETED ANOTHER SUCCESSFUL TEST BETWEEN BALL INSTRUMENT TEST OPERATIONS CONSOLE (ITOC) AND THE GLAS INSTRUMENT.  ALL CURRENTLY IMPLEMENTED COMMANDS AND TELEMETRY WERE EXERCISED, MECHANISMS WERE ACTIVATED, INSTRUMENT WAS POWERED ON, INITIALIZED AND THE ETU LASER WAS FIRED.**
**INSTALLATION OF HEATERS ON UPPER DECK OF THE SPACECRAFT IS IN PROGRESS.  THIS MODIFICATION WILL MINIMIZE THERMAL INDUCED DEFORMATIONS OF THE SPACECRAFT TO GLAS INTERFACE IN ORDER TO HELP MAINTAIN THE INSTRUMENT BORESITE ALIGNMENT.**
**THE NASA FLIGHT PLANNING BOARD HAS MOVED THE ICESAT LAUNCH DATE TO NO EARLIER THAN 12/15/02.**
**CURRENT STATUS:**
**GLAS ON THE PROPOSED RE-PLAN SCHEDULE FOR JUNE 17 DELIVERY**
**ICESat ON THE PROPOSED RE-PLAN SCHEDULE FOR DECEMBER 16 LRD**
_**ISSUES / CONCERNS**_
**NO NEW ISSUES**

**R**

**STATUS AS OF:   2/28/02**