# Presentation: 129191

## EO-1 MISSION READINESS REVIEW

**INDEPENDENT READINESS ASSESSMENT**
- Josef A. Wonsever
- October 5, 2000

## EO-1 MISSION READINESS REVIEWINDEPENDENT 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/Technologies
- 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

- Josef A. Wonsever

## EO-1 MISSION READINESS REVIEWINDEPENDENT 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

- Josef A. Wonsever

## EO-1 MISSION READINESS REVIEWINDEPENDENT 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	   23+16	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	   28+9	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

- Josef A. Wonsever

## EO-1 MISSION READINESS REVIEWINDEPENDENT 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

- Josef A. Wonsever

## EO-1 MISSION READINESS REVIEWINDEPENDENT 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

- Josef A. Wonsever

## EO-1 MISSION READINESS REVIEWINDEPENDENT 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

- Josef A. Wonsever

## EO-1 MISSION READINESS REVIEWINDEPENDENT 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

- Josef A. Wonsever

## EO-1 MISSION READINESS REVIEWINDEPENDENT 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 I&T
- Late paperwork closeout	    Medium	- Augmented staff helped work
- 					  through large bow wave of paper,
- 					- Recently paperwork has
- 					  been kept reasonably current

- Josef A. Wonsever

## EO-1 MISSION READINESS REVIEWINDEPENDENT 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)

- Josef A. Wonsever

## EO-1 MISSION READINESS REVIEWINDEPENDENT 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

- Josef A. Wonsever

## EO-1 MISSION READINESS REVIEWINDEPENDENT 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

- Josef A. Wonsever

## EO-1 MISSION READINESS REVIEWINDEPENDENT READINESS ASSESSMENT

**EO-1 MISSION READINESS REVIEW****INDEPENDENT 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**

- Josef A. Wonsever

## EO-1 MISSION READINESS REVIEWINDEPENDENT READINESS ASSESSMENT

**EO-1 MISSION READINESS REVIEW****INDEPENDENT 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

- Josef A. Wonsever

## EO-1 MISSION READINESS REVIEWINDEPENDENT READINESS ASSESSMENT

- _Recommendation_
- _	__Subject to resolution of Sprague capacitor issue and closeout of remaining RFAs:_
- _	__	_***Ready for Final Launch Processing***

- Josef A. Wonsever

## EO-1 MISSION READINESS REVIEWINDEPENDENT READINESS ASSESSMENT

- _Backup - Spacecraft/Mission Complexity_
- ACS - Three axis stabilized
- Pointing Accuracy 0.022o, Jitter <5 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 @ 0.2 lb each
- Formation Flying required (With Landsat-7)
- C&DH
- Mongoose V processor @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

- Josef A. Wonsever