Engineering review

a) Status of the project

see handout --- annex 9

• B.Gardini hast left SOHO; replaced by F.Vandenbussche as spacecraft manager.
• SM finished (experiments should be checked if they were damaged by acoustic and vibration tests)
• PLM engineering model: SFT to be finished by 9 July 1993
• MCDRs (Spacecraft CDR, Payload CDR and Ground Segment CDR) to take place in the near future
• Comment by K.Wilhelm that the sun-shield of SUMER is still missing in the interface drawings in EID-A. An action was put on the Project to include it there (action 10.6).

b) Spacecraft status

see handout --- annex 10

• EM: all models delivered to Matra + integrated
• FM PLM: structure will be ready early September 93
• FM SVM: ready October 93
• FM subsystems: ready August -- November 93
• Critical areas:

  • tape recorder problems at low temperature and low bit rates still not solved (mainly a problem for Cluster); ESA is studying alternatives (solid state memory)
  • replacement of two FM components may have an impact on the schedule
  • power supply subsytem on critical path

c) Payload development status

see handout --- annex 11

• Helmut Schweizer replaced Yves Constantin as SOHO AIV engineer
• experiment delivery slot: 1.November 93 --- end of January 94
• critical areas:

  • delivery of template to CVZ (31 July 93)
  • closure of main NCR's raised on EM
  • provide FM alignment offset data (16 July 93)
  • provide FM database update (end of July)
  • provide EMC test inputs (15 August 93)

d) Cleanliness

see handout --- annex 12