1、I NIL-HDBK-350 dC W 9999770 0067442 4 9 NOT MEASUREMENT SENSITIVE M I L- H D B K-350 7 JUNE 1991 MILITARY HANDBOOK A Guide for Corrective Action and Disposition System for Nonconforming Material MIL-STD-1520C AMSC N/A AREA QCIC DISTRIBUTION STATEMENT A. Approved for public release; distribution unli
2、mited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-HDBK-350 QC m 9999970 0067443 T m MI L-HDB K-350 FOREWORD 1. This military handbook is approved for use by all Departments and Agencies of the Department of Defense. 2. Guidance in the handbo
3、ok was developed from actual experience during implementation of MIL=STD-l520C, Corrective Action and Disposition System for Nonconforming Material. It provides information useful in training personnel involved in or responsible for tailoring and implementing the standard. The handbook is not to be
4、used as a contractual requirement nor does it supersede any specification requirements or written direction from the procuring activity or the Contract Administration Office (CAO). 3. The handbook includes information relevant to implementation of Statistical Process Control (SPC) and establishing Q
5、uality Improvement Projects (QIPs) for achieving continuous process and product quality improvement as required by MIL-STD-152OC. 4. , Successful implementation of MIL-STD-1520C requires knowledge of the Federal Acquisition Regulation (FAR) Part 46 (and the Defense Federal Acquisition Regulation Sup
6、plement (DFARS) Part 246), Quality Assurance, and an understanding of the applicable quality system requirements. Knowledge of quality management and quality engineering concepts is also important. There ere many sources of information available on these topics. One useful reference, which also prov
7、ides information on other sources, is Jurans Qualitv Control Handbook, fourth edition, by Dr J. M. Juran. 5. MEL-STD-152OC is used with contract quality system requirements described in the FAR 46.202-3 (and DFARS 246.282-3), Higher-level contract quality requirements. MIL-STD-1520C is intended to s
8、upplement those requirements. 6. Facilities, products and management techniques vary widely among DOD contractors. This handbook does not provide detailed guidance for all il Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-HDBK-350 QC 9999970 O06
9、7444 L MI L-HDB K-350 situations but off ers acceptable approaches and alternatives that have been used successfully by Government and the defense industry in implementing MIL-STD-152OC. 7. Teamwork is vital between the contractor, CAO and procuring activity. Clear communications on key processes, v
10、erification methods, delegations and program objectives is needed to establish an effective, economical and efficient system. 8. MIL-STD-1520C is subject to tailoring. Tailoring is an activity that occurs prior to award of a contract and consists of the deletion or modification of those requirements
11、 which are not applicable or not cost-effective for a given acquisition. Specific tailoring guidance is contained, where appropriate, in the tailoring notes following the quoted portion of the standard. 9. When tailoring is applied to production contracts, few, if any, changes to the standard may be
12、 necessary. For other acquisition scenarios (e.g., research and development contracts, cost reimbursement contracts, low volume or limited production efforts, etc.), tailoring should be considered. Suggestions for tailoring in some of these scenarios is contained herein. IO. Records and documentatio
13、n referred to in MIL-STD-1520C may be in the form of computer displays or electronic data processing, provided they are readily available for review and properly safeguarded to prevent unauthorized alteration. 11. The handbook uses the following format: each paragraph (or group of paragraphs) of MIL
14、-STD-1520C is quoted verbatim in italicized print. This is followed by tailoring notes and/or implementation notes. Each quoted portion of the standard, together with any applicable tailoring and/or implementation notes, is set off from the rest of the text by solid horizontal lines. Care has been t
15、aken to quote portions of MIL-STD-1520C in the handbook verbatim. Any errors in these quotations are inadvertent and do not alter or affect the require- ments of MIL-STD-1520C in any way. iii Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MI GHDB Ky
16、350 12. Beneficial comments (recommendations, additions, deletions) and any, pertinent data (e.g., illustrations and actual examples of where guidance is needed) which may be of use in improving this document should be addressed to: Office of the Assistant Secretary of the Air Force (Acquisition), C
17、hief, Manufacturing and Quality Division, AlTN: SAF/AQXM, Washington, DC 20330- 1000, by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. iv Provided by IHSNot for ResaleNo reproduction or networking permitted w
18、ithout license from IHS-,-,-. MIL-HDBK-350 dC 9999970 00b744b 5 MI L-HDB K-350 CONTENTS PARAGRAPH PAGE FOREWORD 1 . SCOPE . 1.1 Purpose . 1.3 1.2 Application 2 Change notice and revisions . 3 2 . REFERENCED DOCUMENTS 3 3 . DEFINITIONS . 3 3.1 Control charts . 3 3.2 Control limits 3 3.3 Corrective ac
19、tion . 7 3.4 Corrective Action Board (CAB) . 7 3.5 Material Review Board (MRB) . 7 3.6 Nonconformance . 8 3.6.1 Minor nonconformance 8 3.6.2 Major/critical nonconformance . 9 3.7 Nonconforming material . 9 3.8 Occurrence 9 3.9 Recurrence 9 3.1 O Preliminary Review (PR) . 9 3.11 Quality Improvement P
20、roject (QIP) 9 3.12 Repair . IO 3.13 Rework 10 3.14 Scrap . 1 0 3.15 Standard Repair Procedure (SRP) 1 0 3.16 Statistical Process Control (SPC) 10 3.17 Supplier . 11 3.18 Use-as-is 11 3.19 Definitions of acronyms used in this standard 11 V Provided by IHSNot for ResaleNo reproduction or networking p
21、ermitted without license from IHS-,-,-MIL-HDBK-350 QC m 9979970 00b7447 7 M MI L=HDB K-350 CONTENTS PARAGRAPH PAGE 4 . GENERAL REQUIREMENTS 11 4.1 Corrective action and disposition system . 11 4.2 Statistical Process Control (SPC) 11 4.2.1 Control limit standards . 17 4.3 Qualityimprovement . 18 Con
22、tractors written procedures . 21 Material Review Board (MRB) 21 MRB authority and responsibilities . 22 Corrective Action Board (CAB) 23 CAB authority and responsibilities . 24 4.7 Government rights 26 4.4 4.5 4.5.1 4.6 4.6.1 5 . 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.7.1 5.7.2 5.7.3 5.7.4 5.8 5.9 5.9.1 5.9.
23、2 5.1 O DETAILED REQUIREMENTS 27 Identification and segregation of nonconforming material 27 PR disposition 28 MRB disposition 30 Use-as-is dispositions . 30 Repair dispositions 32 Scrapped material. 33 Nonconforming material documentation 34 Additional documentation for MRB items 35 Additional docu
24、mentation for corrective action . 35 Recurring nonconformances 36 Nonconformancecosts . 36 Minimum data summarization requirements . 37 Control of material review and disposition system at suppliers 38 Corrective action at supplier facilities . 40 Records of nonconforming material received from supp
25、liers 40 Audits . 40 vi Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MI L-HDB K-350 CONTENT PARAGRAPH PAGE 6 . NOTES . 41 6.1 Intended use . 41 6.2 Changes from previous issue . 41 FIGURE 1 Flow Charts 5 2 Paretocharts . 5 3 Cause and Effect Diagr
26、ams . 6 4 Control Charts 6 5 Histograms . 7 7 The Objective of Effective Process Control . 12 Example of C and Cpk Concepts . 14 8 9 An Example of a QIP which Used Variability Reduction to Improve a Grinding Process . 19 10 An Illustration of Continuous Variability Reduction . 20 6 Scatter Diagrams
27、7 P TABLE Relationship between C C and Parts Per Million (PPM) P Pk 1 . Nonconforming 16 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-HDBK-350 QC W 9999970 OOb7Li49 O W MIL-HDBK-350 _ “FOE WORD. The premises upon which this standard is based h
28、ave not changed and are stated as follows. It is Department of Defense (DOD) policy to reject material and supplies that do not conform to all contractual requirements. Deviation from this policy is permissible only when the Government determines that acceptance of such material and supplies is in i
29、ts best interests. Acceptance of nonconforming material is the sole prerogative of the Government. The act of offering nonconforming material to the Government should be an exception and the consistent offering of noncon formances is indicative of a degradation in the contractors control over qualit
30、y. I “1. SCOPE 1.1 Purpose. This standard sets forth the requirements for a cost- effective corrective action and disposition system for non- conforming material. It defines requirements relative to the interface between the contractor and the contract administration office on nonconforming material
31、. This standard sets forth the DOD contracting activity requirements for a properly constituted Material Review Board. The primary purposes of the corrective action and disposition system are to identify and correct causes of noncon formances, prevent the recurrence of wasteful noncon form- ing mate
32、rial, reduce the cost of manufacturing Inefficiency, and foster quality and productivity improvement. Implementation notes: I. MIL-STD-1520C sets forth the DOD procuring activity requirements for a properly constituted Material Review Board (MRB) as referred to in MILSTD- 480B, Configuration Control
33、-Engineering Changes, Deviations and Waivers, paragraph 5.4, Requirements for waivers. 2. Application of this standard provides a means for improving quality and productivity, thereby reducing losses associated with nonconforming material. When effectively implemented, it results in fewer nonconform
34、ances, lower nonconformance costs and better first-time pass rates. 3. MIL-STD4520C recognizes that investigation and corrective action for every Instance of nonconforming material as if they are of equal significance or consequence is not cost-effective. Focusing correctiwe action effort is one 1 P
35、rovided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-HDBK-350 PC = 9997970 00b450 7 MI L-HDBK1350 extremely important feature of this standard. Nonconformances impacting safety, performance, high rate manufacturing processes or delivery schedules requi
36、re immediate corrective action to prevent further recurrence. While every nonconformance can offer an opportunity to improve, for isolated nonrecurring nonconformances the cost of investigation and corrective action could exceed the loss. An effective corrective action and disposition system directs
37、 resources toward those nonconformances with the greatest impact and potential for quality improvement. Pareto analysis (see figure 2, page 5) offers one effective method for focusing on the significant few with the greatest potential return. “1.2 Application. When referenced in a contract, this sta
38、ndard applies to material and supplies (excluding computer software) to be delivered to the Government which fail to conform to contractual requirements. Requests for specification changes, engineering changes, and major and critical waivers and deviations are not applicable to this standard. Implem
39、entation notes: 1. As is the case with computer software, this standard is not intended for the disposition of nonconforming technical or engineering data to be delivered to the Government. Nevertheless, the corrective action provisions of the standard do apply to computer software and technical or
40、engineering data (or anything else) when it is a cause of nonconforming material. 2. The standard is not intended for approval or disapproval of deviations, minor or otherwise (as defined by MIL-STD480B). 3. MILSTD4520C is also not intended for application to equipment during field use. Once equipme
41、nt is “delivered“ for use, whether material was accepted by the Government or not, nonconformance reporting is normally accomplished by Product Quality Deficiency Report or Service Report. However, these reports and other sources of field use data when analyzed by the Corrective Action Board (CAB) o
42、r other personnel can provide a valuable source of information for use in improving the design, development and production processes. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-HDBK-350 QC 9999770 00b745L I MI L-H DB K-350 1.3 Chanae noti
43、ces and revisions. Whenever this standard is changed or revised subsequent to its contractually effective date, the contractor may follow or authorize its suppliers to follow the changed or revised standard provided no increase in price or fee is required. The contractor shall not be required to fol
44、low the changed or revised standard except as a change in contract. If the contractor elects to follow the changed or revised standard, the contractor shall notify the contracting officer in writing of this election. When the contractor elects to follow the provisions of a change or revision, the co
45、ntractor must follow them in full unless otherwise authorized in writing by the contracting officer. If 2 REFERENCED DOCUMENTS Not Applicable.“ “3. DEFINITIONS“ Tailarina note: 1. As a result of tailoring the requirements of this standard, some definitions may no longer be applicable. Since they con
46、tain no inherent action, tailoring the definitions is optional. “3.1 Control charts. A graphic representation of data used to detect, identify, analyze, and eliminate unacceptable variation in a given characteristic, process, or product. Computer soft ware programs may be used for this purpose witho
47、ut a need to display the control chart itself. Commonly used control charts include variables or attributes process data and associated control limits, scatter plots of trends, histograms, and graphic displays of nonconformances by category. Control charts facilitate analysis of the process yield le
48、ading to potential changes in processes, methods, machines, and requirements documenta tion; evaluation of defect distributions to focus on significant causes of nonconformance; analysis to distinguish between chance and assignable causes of variation; and monitoring of the effectiveness of correcti
49、ve action. “3.2 Control limits. Control limits are criteria that establish maximum variation beyond which action must be taken to in- vestigate and when feasible correct the cause(s) of nonconformance. Control limits do not preclude corrective action when abnormal patterns of variation occur without any individual data exceeding the control limits. Control limits are developed usin
