STATUS/ACCOMPLISHMENTS
The systems team continues the preliminary design process by working a 
number of Spacecraft post-SCR implementation issues. This included 
assisting mechanical and propulsion team trades of S/C bus and propulsion 
system design options in response to SCR recommendations, concluding a 
trade on modifying the initial insertion orbit to alleviate GN&C 
design/implementation issues, and evaluating solar array sizing versus S/C 
power and High Gain Antenna field-of-view coverage requirements.  In 
addition, the team assisted in addressing C&DH Single-Board Computer (SBC) 
requirements, parts and design issues in preparation for releasing the SBC 
procurement, and continued ongoing Subsystem Data Node (SDN) development 
definition relating to SDN design and prototype development.  In the 
Operations area, the team assisted in defining and documenting level 3 
implementation requirements, instrument data capture requirements, and the 
S-Band operations concept implementation approach.

For the Instruments, work continues with the development of the instrument 
ICDs.  We completed the initial listing of Electrical Systems (harnessing, 
grounding, EMI/EMC) and Power interface requirements.  Next week we will 
conduct interface meetings with C&DH and the High-Rate Science bus.  We 
also continued our evaluation of the reorientation of the SPECTRE subsystem 
of SHARPP and have identified a leading accommodations candidate which 
locates SPECTRE on an adjacent panel and swaps HMI & EVE.  This has HMI 
revisiting their desire of "mirror imaging" their instrument as discussed 
last week.  The proposed reorientation  was reviewed with all instrument 
teams and was given a consensus approval.  We are now working out the close 
details to make sure nothing has been overlooked.  The second telecon of 
the SDO CCD and Camera Electronics Working Group was conducted.  The E2V 
(detectors) and RAL (electronics) proposals were reviewed and specific 
technical questions were addressed.  In conjunction with SHARPP's visit to 
Europe next month, follow-up meetings were set with E2V and RAL for May 14 -16.

HMI conducted a science team meeting this week at Stanford University to 
coordinate science activities.  EVE work this week focused on peer reviews 
of their power supply concept and their system thermal design concept.  The 
EVE team also started the organization & development of their Concept Study 
Report (CSR) that is due this summer.  The intent is to have a completed 
preliminary draft in place by the 5/21 EVE science team meeting.

In the area of CM & Project Support, we completed initial drafts of all the 
subsystem development plans (17 total), processed and released the CCR for 
the NRL contract modification (E2V CCD & RAL camera electronics engineering 
phases), coordinated comments to the Mission Assurance Requirements 
document for a CCB the week of 5/12, started assembling the quality portion 
of the Single Board Procurement RFP, and continue to prepare for the 
Intranet document & CCR database demo/review next week.  We are also 
working property transfers for property to be used by SDO personnel and 
arranging key cards (Bldgs. 7/15/29 complex) for all SDO personnel in 
anticipation of the new 24hrs x 7days key card requirement for access to 
our complex.  In addition, we conducted small purchases up to the last 
day/minute (4/28, 4:50pm) prior to the Small Purchases System (SPS) being 
shutdown for the IFMP transition.

The Ground System team continued to mature three of their leading 
documents; the Detailed Mission Requirements (DMR), the Operations Concept 
Document, and the Interface Control Document (template) between the ground 
system and instruments.  The team completed a detailed level schedule which 
includes 249 ground system interconnected development activities.  They 
also started discussions with the Universal Space Network (USN) as to the 
USN's ability to support early orbit & periodic SDO contacts.

Thanks,
Ken

"Only he or she who can see the invisible can do the impossible."
Frank Gaines

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