TOR ECSS-Q-ST-70-50
19 November 2008
EUROPEAN COOPERATION FOR SPACE STANDARDIZATION
TECHNICAL AUTHORITY (TA)
Terms of Reference
ECSS-Q-ST-70-50 “PARTICLE CONTAMINATION MONITORING FOR SPACECRAFT SYSTEM AND
CLEANROOMS”
1.
PURPOSE
This Working Group shall draft a Level 3 ECSS Standard according to the intended scope of the document.
This ECSS Standard describes the procedures to be used to measure, to monitor and to maintain the level
of particle cleanliness beyond the scope of the ECSS-Q-70-01, and to control the compliance of the particles
cleanliness requirements allocated to spacecraft system and cleanrooms
2.
INTENDED SCOPE
Particulate contaminants can be hazardous to spacecraft in a number of ways including failure of precision
mechanisms, light absorption and scattering, points of high local electric field and associated electrostatic
discharge, and noise on electrical contacts. It is therefore important to control, measure and verify the
particulate contamination levels on spacecraft systems and the environments in which they reside, in order
that an assessment can be made on any hazards that may be present as a result of such contamination.
The objective of this standard is to ensure that the particle monitoring of spacecraft systems and cleanrooms
utilised in the production of such systems, is carried out in an appropriate manner, and is controlled both in
terms of the precision of the measurements and the reproducibility of such measurements.
This standard shall define the requirements and guidelines for the measurement of particulate contamination
on the surfaces of spacecraft systems and those of the cleanrooms or other cleanliness controlled areas in
which they reside.
This standard shall include:
 the measurement method of particulate contamination that is present on the spacecraft or cleanroom
surfaces via the use of representative witness samples placed in the vicinity of the spacecraft
hardware,
 the direct measurement method of particulate contamination levels on surfaces of spacecraft
hardware from the direct surface transfer to adhesive tape-lift samples and particulate contaminant
levels within fluids used for the cleaning or rinsing of such spacecraft system components and
cleanroom surfaces
 the methods to be used for the visual inspection of spacecraft system hardware for particulate
contamination.
The measurement of airborne particulate contamination shall be not covered in this standard and ISO 14644
“Cleanrooms and associated controlled environments” shall be applicable in this case.
3.
MANDATORY INPUTS
While the Working Group is free to consider any other relevant information during its activities, the following
documents shall be considered:
TOR ECSS-Q-ST-70-50
19 November 2008
3.1 Documents applicable to the draft document:
ECSS-S-ST-00
ECSS-S-ST-00-01
ECSS-Q-ST-10
ECSS-Q-ST-20
ECSS-Q-ST-70
ECSS-Q-ST-70-01
ISO 14644-1
ISO 14644-2
IEST-STD-CC1246D
FS 505146C
4.
ECSS system – Description, implementation and general requirements
ECSS system - Glossary of terms
Space product assurance – Product assurance mangement
Space product assurance - Quality assurance
Space product assurance - Materials, mechanical parts and processes
Space product assurance - Cleanliness and contamination control
Cleanrooms and Associated Controlled Environments – part 1: Classification
of air cleanliness.
Cleanrooms and Associated Controlled Environments – part 2: Specification
for testing and monitoring to prove continued compliance with ISO 14644-1.
Product cleanliness levels and contamination control program
Detailed specifications, general cleaning of materials
WORKING GROUP ORGANIZATION
4.1 General
The Working Group shall be responsible for the organization of its own work.
4.2 Working Group Composition Proposal
See file “Working Group Composition Proposal – ECSS-Q-ST-70-50_JDv1.doc”
4.3 Working Group interfaces
Internal
Support from the Executive Secretariat throughout the development of the document.
External to ECSS
N/A
5.
5.1.
ACTIVITIES
General
The Working Group shall perform the following activities in accordance with ECSS-S-ST-00 :
a.
The WG convenor shall submit to the TA and the Executive Secretariat a written progress report at
agreed dates, using the WG report form.
b.
The WG shall update the existing draft ECSS-Q-ST-70-50 in line with the scope and in conformity
with the requirements contained in the documents included in 3.1.
c.
The WG convenor shall resolve with the Executive Secretariat any comments from the conformity
check, involving the WG if the comments impact on the technical contents. After resolution of the
comments, he shall produce a final draft for Review, and submit this draft to the TA via the
Executive Secretariat.
d.
Together with the final draft the convenor shall submit to the TA via the Executive Secretariat, an
End-of-drafting report, including:
1. difficulties found during the drafting,
2. lessons learned.
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19 November 2008
e.
The WG shall respond to any DRRs coming from the Public Review of the standard and providing
feedback to DRR originators (especially if negative). The convenor shall present the proposed
dispositions of the DRRs to the TA, for acceptance.
f.
The WG convenor shall update the draft with the accepted dispositions to the DRRs, involving the
WG if the changes that are introduced heavily affect the technical content of the standard, and
submit the final draft, to the TA via the Executive Secretariat.
g.
The WG convenor shall provide to the Discipline Focal Point (Q-70 Convenor) all working
documents (i.e. minute of meeting, progress reports and any Intermediate drafts produced) for
information.
h.
Before sending any Draft ECSS-Q-ST-70-50 to the TA, either before or after Public Review, the WG
convenor shall submit it to the Discipline Focal Point (Q-70 Convenor) for his endorsement.
5.2.
Drafting approach
The document will be written to be a Requirements Document, guidelines and informative text will be
included as an informative annex.
DRD (if any) will be included in a normative annex.
6.
MILESTONES
The following key milestones are expected:
February 2009
April 2009
June 2009
September 2009
October 2009
7.
Working Group Kick-off meeting
Delivery of Intermediate draft for ES/TA area responsible and discipline focal point
assessment and comments
Delivery of final draft to ES for public review
End of DRRs dispositions and update of the draft
Delivery of the final draft for TA vote for puiblicationm
RESOURCES ESTIMATE
ESA manpower: 0.3 manyear
Planned missions depending on available expertise:
3 meetings at ESTEC
2 meetings at CNES/industry
Planned meetings until 1st draft: 3
8.
OUTPUTS
The following outputs shall be provided:
a. Regular progress reports to the TA via the Executive Secretariat.
b. If necessary, special reports to the TA via the Executive Secretariat, to raise specific attention on urgent
issues and problems not solved at WG level.
c. Intermediate drafts, for review.
d. Final draft for TA approval to go for public review.
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19 November 2008
e. Disposition of DRRs coming from PR, and updated draft.
f. End of drafting report, including at least difficulties met during the drafting, and lessons learned.
g. Document Focal Point identification (after release of the document).