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Update on the ESA Lead Free Control Plan (LFCP) Working Group. Barrie Dunn [email protected] May 2011. Main Objective of the Working Group. Main Objective of the Working Group is to publish a “Lead-free Control Plan” (LFCP) that can be used by the Space Industry in order to: - PowerPoint PPT Presentation
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ESA UNCLASSIFIED – For Official Use
Update on the ESA Lead Free Control Plan (LFCP) Working GroupBarrie [email protected] 2011
ESA UNCLASSIFIED – For Official Use
ESA Presentation | Barrie Dunn | May 2011 | TEC-Q | Slide 2
Main Objective of the Working Group is to publish a “Lead-free Control Plan” (LFCP)
that can be used by the Space Industry in order to:ensure that spacecraft electrical systems and related hardware comply with the contractual requirements of ECSS standards, and,assess the inherent risks with Pb-free
As of May 2011, the Plan is about 60% complete
Intention is to publish it as an ESA STR document (not a Standard, but a “good practice” document, parts of which could be formalised in the future as requirements)
Main Objective of the Working Group
ESA UNCLASSIFIED – For Official Use
ESA Presentation | Barrie Dunn | May 2011 | TEC-Q | Slide 3
To exchange, share information, return of experience concerning Lead-Free
To identify the issues and problems to be solved regarding the concerns expressed by the CTB members
To define recommendations for solutions and answers to these concerns
The scope includes:•EEE components and COTS devices•Connectors•PCBs•Solder•Peripheral hardware : clamps, screws, pins, wires, electronic housings
Secondary Objectives :
ESA UNCLASSIFIED – For Official Use
ESA Presentation | Barrie Dunn | May 2011 | TEC-Q | Slide 4
Chapter Titles for LFCP
Introduction (Chapter 1) Problems associated with Lead-free (processes at higher temperatures, materials
with different mech props, solderability, inspection criteria, whiskers, rework/repair, mixing of alloys, traceability, black pad, etc.) (Chapter2)
ESA Requirements (Chapter 3) Definition of Pure Tin (Chapter 4) Assessment of Suppliers’ LFCPs (Chapter 5) Methods for detecting Tin and Lead (Chapter 6) Method for Re-processing component terminations (Chapter 7) Mitigation strategies for the avoidance of failures due to tin whiskers (Chapter 8) Illustrations of problem situations (Annex 1) Check List (for in-house awareness and auditing purposes) (Annex 2)
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ESA Presentation | Barrie Dunn | May 2011 | TEC-Q | Slide 5
Restriction of the use of certain hazardous substances in electrical and electronic equipment ***I
This Directive does not apply to:a) equipment which is necessary for the protection of the essential interests of the security
of Member States, including arms, munitions and war material intended for specifically military purposes;
b) equipment designed to be sent into space; c) equipment which is specifically designed and to be installed as part of another type of
equipment that is excluded or does not fall within the scope of this Directive, which can fulfil its function only if it is part of that equipment, and which can be replaced only by the same specifically designed equipment ;
d) large-scale stationary industrial tools;e) large-scale fixed installations;f) means of transport for persons or goods, excluding electric two-wheel vehicles which
are not type-approved.
A7-0196/2010P7_TA-ROV(2010)0431
ESA UNCLASSIFIED – For Official Use
ESA Presentation | Barrie Dunn | May 2011 | TEC-Q | Slide 6
Lead-free Control Plan Working Group
– Flow Diagram for Plan (suggestion):
1. Procurement to define lead-free requirements 2. Incoming Inspection
of components, pcbs,terminal posts, connectors
Using: visual, swab (red means lead),XRF, SEM-EDAX,etc.
3. Lead-free parts mayneed reprocessing
de-tin, pre-tin with solder,etc. per ECSS-Q-STD-70-08
4. Impossible to reprocessthen a Risk Assessment
is needed
5. Risk Assessmentwill include consideration of mitigation possibilities
involving: tin composition, tin thickness,substrate material, heat treatment history,
track/line spacing distance, conformal coating,environment exposure (life, temperature, cycles, etc.)
ESA UNCLASSIFIED – For Official Use
ESA Presentation | Barrie Dunn | May 2011 | TEC-Q | Slide 7
Lead-free Control Plan Working Group
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ESA Presentation | Barrie Dunn | May 2011 | TEC-Q | Slide 8
ESA UNCLASSIFIED – For Official Use
ESA Presentation | Barrie Dunn | May 2011 | TEC-Q | Slide 9
ESA UNCLASSIFIED – For Official Use
ESA Presentation | Barrie Dunn | May 2011 | TEC-Q | Slide 10
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ESA Presentation | Barrie Dunn | May 2011 | TEC-Q | Slide 11
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ESA Presentation | Barrie Dunn | May 2011 | TEC-Q | Slide 12
Cross section 3
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ESA Presentation | Barrie Dunn | May 2011 | TEC-Q | Slide 13
APPENDIX 2 of LFCP:CHECK LIST FOR CONTROLLING THE AVOIDANCE OF LEAD-FREE MATERIALS AND COMPONENTS
No. Yes No Comments
1 Is there a Materials and Processes manager to supervise lead-free policies and forbidden materials per ECSS-Q-70B.
Do Declared Materials, Components, Processes and Mechanical Parts Lists exist.
Does the supplier have a Lead-Free Control Plan (LFCP).
Is one individual responsible for documenting and operating the tasks specified in the LFCP (comment on named individual).
ESA UNCLASSIFIED – For Official Use
ESA Presentation | Barrie Dunn | May 2011 | TEC-Q | Slide 14
Technical Tasks for WG members: Understand EU Directives
Risks and Limitations with Lead-free such as: tin whiskers, solder joint reliability, copper dissolution, cross contamination, higher processing temperatures (most of these have been researched with answers available and some have been identified for small studies by ESA)
Components and other items delivered per ECSS requirements must be without pure tin – inspection methods
Provide recommendations for reworking pure tin components
Identify other small studies where information is missing (such as the SPUR tin chemical stripping study)
Present WG Members are from: ESA (Chair), CNES, Astrium, THALES Group, SEA Ltd UK
NEW MEMBERS ARE WELCOME
1. Technical Tasks for WG members:
ESA UNCLASSIFIED – For Official Use
ESA Presentation | Barrie Dunn | May 2011 | TEC-Q | Slide 15
Link between LFCP & PSWG ad hoc WG on “Pb free incoming inspection test
ESCC
SCSB
CTB PSWG
ECSS
Technical Authority
Discipline focal point
Ad hoc WG on Pb free incoming inspection test
Lead Free Control Plan
ECSS-Q-ST-60-13 (COTS)
RNC-CNES-Q-ST-60-100 (COTS)
Astrium, TAS, others procedures
Cooperation on Q-60 discipline
ESA UNCLASSIFIED – For Official Use
ESA Presentation | Barrie Dunn | May 2011 | TEC-Q | Slide 16
LFCP WG Next Meetings will be in the form of small workshops at THALES, Toulouse
15th June 2011 “Re-processing of component terminations” based on existing Thales and Astrium experiences and novel ideas from industry
22nd September 2011: “Risk Assessment and Mitigation associated with lead-free and whisker growths” based on existing computer programmes and novel ideas from industry
INPUTS from both Workshops will be used for the LFCP Chapters 6, 7 and 8
All Component and Materials specialists are invited to attend, contact:
or
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