1. ASPERA-3 April. 25, 01 Monthly Status Report ASPERA Monthly Status ReportMonthly 4_25/ Page 1 Monthly Status Report Report due 4/25/01 Schedule statused as of April 13, 2001

2. ASPERA-3 April. 25, 01 Monthly Status Report ASPERA Monthly Status ReportMonthly 4_25/ Page 2 Project Status Summary Technical Feb Mar Apr Detailed Description: (for items identified as yellow or red) Programmatic Feb Mar Apr Schedule Feb Mar Apr Resources Feb Mar Apr As noted last month, following delivery of the ELS flight unit, it was found that there was an error in the fabrication of the flight, flight spare, and prototype ELS amp board. We have received the flight unit back from Sweden; have modified, ordered, received and assembled the new amp board; and have assembled the new amp board in the flight unit. The flight unit is currently in the vacuum chamber being characterized. We have also worked out the delivery schedule and funding requirements for the amp board fix. The Software Requirements Specification has been completed and is in the signature cycle. Latest project photos and videos are available on Aspera-3 web site.photosvideos

3. ASPERA-3 April. 25, 01 Monthly Status Report ASPERA Monthly Status ReportMonthly 4_25/ Page 3 Problem and Concern Summary P=Problem C=Concern R=Resolved

4. ASPERA-3 April. 25, 01 Monthly Status Report ASPERA Monthly Status ReportMonthly 4_25/ Page 4 Accomplishments of the Last Month -ELS Received the flight unit back from Sweden. Modified the amp board layout to correct the anode to amplifier connection. Ordered and received new boards. Flight board has been assembled and bench tested. Assembled the new amp board into the flight unit. Flight unit is now being characterized in the vacuum chamber. Submitted proposal to NMO for forward funding of FY02 funds for amp board fix. Worked out ELS flight unit re-delivery details with IRF and MSSL. Re-delivery is now set for May 15.

5. ASPERA-3 April. 25, 01 Monthly Status Report ASPERA Monthly Status ReportMonthly 4_25/ Page 5 Accomplishments of the Last Month - IMA IMA hardware activities are complete.

6. ASPERA-3 April. 25, 01 Monthly Status Report ASPERA Monthly Status ReportMonthly 4_25/ Page 6 Accomplishments of the Last Month - Data Reduction Software Continued Working on APAF Software Requirements Specification (SRS) –Version 1.0 sent to ASPERA-3 Team for Final Review April 17, 2001 –Sign-off in Progress –On Schedule to Deliver by May 1, 2001 Began Packet Definitions for IMA and NPI Continued Dialog with Staff of PDS PPI Node and ESTEC Staff for ASPERA-3 Data Archiving Plans Continued Providing Technical Assistance for EPO Web Information Continued Defining and Implementing IDFS Web Tools Held monthly ASPERA-3 Software Status Meeting (April 24, 2001) Submitted detailed software schedule to NMO

7. ASPERA-3 April. 25, 01 Monthly Status Report ASPERA Monthly Status ReportMonthly 4_25/ Page 7 Planned Activities for the Next Month - ELS Finish preliminary characterization testing of flight model. Assemble new flight spare amplifier board. Bench test and thermal test new amp boards. Reassemble flight and flight spare with new boards. Vibe flight unit. Perform limited characterization of flight unit post vibe.

8. ASPERA-3 April. 25, 01 Monthly Status Report ASPERA Monthly Status ReportMonthly 4_25/ Page 8 Planned Activities for the Next Month - IMA None.

9. ASPERA-3 April. 25, 01 Monthly Status Report ASPERA Monthly Status ReportMonthly 4_25/ Page 9 Planned Activities for the Next Month - Data Reduction Software Tasks Begin Updates to APAF Software Development Plan (SDP) Version 1.3 to be Released June 7, 2001 Continue Packet Definitions for IMA and NPI Continue Dialog with Staff of PDS PPI Node and ESTEC Staff for ASPERA-3 Data Archiving Plans Continue Providing Technical Assistance for EPO Web Information Continue Defining and Implementing IDFS Web Tools

10. ASPERA-3 April. 25, 01 Monthly Status Report ASPERA Monthly Status ReportMonthly 4_25/ Page 10 Problem and Concern Status Funding for ELS board fix: During the last month we settled on a plan and delivery schedule for the repaired ELS flight unit. We also submitted a proposal to NASA for forward funding of a small portion of the FY02 dollars (late in FY01) to cover the costs of the repair of the amp board. All actions have been agreed to at this time. We are leaving this item as a concern only because the funding has not yet been received (or needed). We do not anticipate a problem in the future.

11. ASPERA-3 April. 25, 01 Monthly Status Report ASPERA Monthly Status ReportMonthly 4_25/ Page 11 Schedule Summary ELS: As stated previously, the ELS flight unit is now scheduled to be delivered on May 15. (The MSSL calibration chamber is occupied up until that time). We are on track to meet this date. Software: A new detailed software development schedule was submitted to NASA during the last month. Software activities are on schedule. The full-up schedule is available on the ASPERA-3 Web site.schedule

12. ASPERA-3 April. 25, 01 Monthly Status Report ASPERA Monthly Status ReportMonthly 4_25/ Page 12 ASPERA-3 PHASE B/C/D MASTER SCHEDULE To be supplied later.