REG NASA-LLIS-0982-2001 Lessons Learned Retention of Traceability Data for EEE Parts.pdf

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1、Lessons Learned Entry: 0982Lesson Info:a71 Lesson Number: 0982a71 Lesson Date: 2001-04-17a71 Submitting Organization: GSFCa71 Submitted by: Mike Sampson and Jay BrusseSubject: Retention of Traceability Data for EEE Parts Description of Driving Event: Effective, critical traceability of EEE parts may

2、 be lost if original shipping containers and documentation are not retained by original equipment manufacturers (OEMs) and their contractors.Lesson(s) Learned: Recently, NASA Goddard Space Flight Center (GSFC) has observed that many hardware builders repackage EEE parts during receiving inspection a

3、nd discard the part manufacturers original shipping containers. This practice can lead to loss of vital lot traceability information because in many cases, the shipping containers contain unique lot information that may not be provided by the part markings or other shipping documentation (Certificat

4、es of Compliance, etc.) that is typically retained by the user. This problem may also occur if the user discards the paperwork and/or packaging when all the parts in the package have been used.Accurate and detailed EEE part lot traceability information may be critical in order to perform risk assess

5、ments, circuit performance analysis and failure investigations especially when problems are reported for parts that may already be assembled into hardware or when troubleshooting on-orbit anomalies. The EEE part manufacturer generally establishes lot traceability through a combination of the manufac

6、turers part number, CAGE code and a unique “production“ Lot Date Code (LDC). Generally speaking, the “production“ LDC identifies a group of parts of the same style and ratings that are manufactured from the same raw material lots and are processed through all critical manufacturing steps and tests a

7、s a single group. As such, the “production“ LDC is an invaluable lot identifier. Unfortunately, this “production“ LDC is generally NOT marked directly on the parts (especially for smaller “chip“ style components where there may be insufficient room for any part markings) and is sometimes only provid

8、ed to the user on labels affixed to the original shipping containers for the parts (i.e., C of C may not contain “production“ LDC info).Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-It is important to note that a “production“ LDC is not the same as

9、 the “inspection“ LDC (or “marking“ LDC) which is commonly marked directly on the part and shipping documentation. (For MIL specification products, the LDC marked on the parts is the “inspection“ LDC). The “inspection“ LDC generally represents the year and week when a group of parts is subjected to

10、the manufacturers final test and inspection (end of production test). It is very probable for a manufacturer to submit many different production lots of the same part type to final inspection during the same week. As such, each “inspection“ lot may be me made up of multiple “production“ lots. When a

11、 problem is later discovered that is attributed to a specific “production lot,“ the user may not be able to effectively assess risk if the only traceability data they have on file is the “inspection“ LDC.Figure 1 helps to illustrate a recent example where disposal of the manufacturers original shipp

12、ing containers resulted in loss of effective lot traceability. This figure shows the original shipping container of one tantalum chip capacitor manufacturer. A label affixed to the container by the manufacturer provides vital lot traceability information including procurement part number, manufactur

13、er part number, CAGE Code, “production“ LDC and “inspection“ LDC. The other shipping documentation that accompanied this manufacturers shipment did NOT contain the “production“ LDC. Different users of this manufacturers parts discarded this container (and label) after performing receiving inspection

14、 or stocking or kitting the parts. When problems with this manufacturers parts were later reported, having only part number and “inspection“ LDC (from part markings and C of C) made traceability back to the manufacturers original production traveler information exceedingly difficult, if not impossib

15、le. Therefore, valuable lot pedigree information could not be obtained to assist in the risk assessment process.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-refer to D descriptionDRecommendation(s): To assist in effective lot traceability it is su

16、ggested to require OEMs and their contractors to retain ALL of the EEE part manufacturers original shipping documentation AND packaging information. If shipping containers cannot be retained, then pertinent labels should be copied or carefully removed for storage along with other pertinent receiving

17、 inspection data. In addition, it is suggested to retain this traceability information for the duration of the mission in the event that this data is required to address on-orbit anomalies.Evidence of Recurrence Control Effectiveness: N/ADocuments Related to Lesson: N/AProvided by IHSNot for ResaleN

18、o reproduction or networking permitted without license from IHS-,-,-Mission Directorate(s): a71 Exploration Systemsa71 Sciencea71 Space Operationsa71 Aeronautics ResearchAdditional Key Phrase(s): a71 Aircrafta71 Configuration Managementa71 Flight Equipmenta71 Ground Equipmenta71 Hardwarea71 Logistic

19、sa71 Packaging Handling Storagea71 Parts Materials & Processesa71 Procurement Small Business & Industrial Relationsa71 Risk Management/Assessmenta71 Safety & Mission AssuranceAdditional Info: Approval Info: a71 Approval Date: 2001-08-07a71 Approval Name: Jay Liebowitza71 Approval Organization: GSFCa71 Approval Phone Number: 301-286-4467Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-