STATUS/ACCOMPLISHMENTS
The systems team focused on the subsystem data node (SDN) design and 
development effort this week by meeting with the various design leads to 
evaluate backplane design options as well as the technical and programmatic 
ramifications of each approach.  A decision on a final SDN approach is 
expected within a week.  In addition, a systems team configuration change 
request (CCR) to modify the minimum observatory insertion perigee from 185 
km to 300 km was evaluated and approved by the project, significantly 
easing the observatory reaction wheel (RW) design requirements.  In a 
related area, the RW trade study is nearing completion and is expected to 
result in a make/buy recommendation within the next week.  The systems team 
also began discussions with members of the Independent Review Team (IRT) on 
opportunities to meet and discuss areas where further information and 
discussion was requested.

For the instruments, we held a telecon with EVE and went over coordination 
details including the need to provide more task detail in their proposed 
early procurement of MIT Lincoln Labs SOW for their CCDs.  The SDO 
Instrument Systems Mgr. sat in on the STEREO Project's programmatics 
meeting with NRL SECCHI.  I thank STEREO for the invitation.

The System Assurance team attended the mission success criteria meeting, 
where the SDO Project Scientist presented the updated requirements 
matrix.  This matrix shows the importance of each instrument sensor 
relative to their contribution in addressing each of the science 
questions.  It also defines the percentage contribution necessary for full 
and minimum mission success.  The matrix will be useful in the development 
of mission level fault trees and reliability block diagrams.  In addition, 
the reliability group developed a fault tree based on the current design 
configuration of the propulsion system.

In the area of CM, we held our second CCB and approved the following CCRs: 
Mission Assurance Requirements (MAR) document; & the increase perigee 
altitude at separation from 185 km to 300km).  After I sign the SDO MAR, it 
will be forwarded to Wentworth Denoon (Code 300 director) for 
signature.  The Integrated Independent Review Plan (GSFC SDO document) was 
also approved by GSFC Codes 400 & 100.

Thanks,
Ken

"What lies behind us and what lies before us are tiny matters compared with 
what lies within us."
Oliver Wendell Holmes
American Jurist & Chief Justice of the Supreme Court

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