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MIL HDBK 1823, 1 This handbook is approved for use by all Departments and Agencies of the Department of. Defense DoD, 2 This handbook is for guidance only This handbook cannot be cited as a requirement If it is. the contractor does not have to comply, 3 Beneficial comments recommendations additions deletions and any pertinent data which. may be of use in improving this document should be addressed to ASC ENSI 2530 Loop. Road West Bldg 560 Wright Patterson AFB OH 45433 7101 by using the Standardization. Document Improvement Proposal DD Form 1426 appearing at the end of this document or by. MIL HDBK 1823,PARAGRAPH PAGE,1 1 Scope 1,1 2 Limitations 1. 1 3 Classification 1,2 APPLICABLE DOCUMENTS 1,2 1 General 1.
2 2 Government documents 1,2 2 1 Specifications standards and handbooks 1. 2 3 Non Government publications 2,2 4 Order of precedence 2. 3 DEFINITIONS 2,4 GENERAL REQUIREMENTS 4,4 1 General 4. 4 2 System definition and control 4,4 3 Demonstration design 4. 4 3 1 Experimental design 5,4 3 1 1 Test variables 5.
4 3 1 2 Test matrix 7,4 3 2 Test specimens 7, 4 3 2 1 Flaw sizes and number of flawed and unflawed inspection sites 8. 4 3 2 2 Physical characteristics of the test specimens 8. 4 3 2 3 Specimen maintenance 9,4 3 2 3 1 Specimen flaw response measurement 9. 4 3 2 3 2 Multiple specimen sets 10,4 3 2 4 Hardware specimens 10. 4 3 3 Test procedures 10,4 3 4 Demonstration process control 11. 4 4 Demonstration tests 11,4 4 1 Inspection reports 11.
4 4 2 Failure during the performance of the demonstration test program 12. 4 4 3 Preliminary tests 12,4 5 Data analysis 12,4 5 1 Missing data 12. 4 6 Presentation of results 13,4 6 1 Category I NDE system 13. 4 6 2 Category II Experimental design 13,4 6 3 Category III Individual test results 14. 4 6 4 Category IV Summary results 14,4 6 5 Summary report 15. 4 6 5 1 Summary report documentation 15,4 7 Retesting 15.
4 8 Process control plan 15,5 DETAILED REQUIREMENTS 16. 5 1 General 16,6 NOTES 16,6 1 Intended use 16, 6 2 Trade offs between ideal and practical demonstrations 16. 6 2 1 Solution 16,MIL HDBK 1823,PARAGRAPH PAGE,6 3 Other topics 16. 6 3 1 False call analysis 17,6 3 2 Rates of false indications 17. 6 3 3 POD from multiple inspections 17,6 3 4 Inspection of EDM notched parts 18.
6 3 4 1 Evaluation of applicability of PODs 18,6 3 4 2 Example of eddy current inspection 18. 6 3 4 2 1 Resolution of variances 19,6 3 5 Ill behaved data 19. 6 4 Subject term key word listing 19,1 Eddy Current Data Sheet 23. 2 Eddy Liquid Penetrant Test Data Sheet 28,3 Eddy Ultrasonic Test Data Sheet 33. 4 Parallel Lines indicate No 2 Factor Interaction 38. 5 Interactions cause the lines to cross 38, 6 A cube representing a full 2x2x2 factorial experiment 40.
7 A cube representing a fractional factorial experiment 43. 8 First turbine disk 47,9 Crack geometry relationship 50. 10 Crack geometry relationship at 0 060 depth 51,11 Final crack manufacture 52. 12 F100 PW ENSIP manufacturing inspection reliability test 53. 13 Flaw location reference 54, 14 F100 PW ENSIP manufacturing inspection reliability test 55. 15 Flaw location reference 56, 16 Resolution in POD vs resolution in cracksize 59. 17 Large bolthole specimens Shaded region is probability of detection 64. 18 Residuals of 10 inspections are approximately normally distributed 65. 19 POD vs A ECI data analysis PWA 1074 bolthole specimens 76. 20 Actual Defect size depth inches 83, 21 Example data sheet for describing the experimental design 97.
22 Example data sheet for describing the experimental design 98. 23 Example data sheet for test results 99,24 vs a analysis 100. 25 Hit miss analysis 101,26 POD a for vs a analysis 102. 27 POD a for hit miss analysis 103,28 Log a vs log a for vs a analysis 104. 29 Observed detections and POD for hit miss analysis 105. TABLE I Full Factorial test conditions for figure 6 41. TABLE II Fractional factorial test conditions for figure 7 42. TABLE III An improper fractional factorial experiment etc 44. MIL HDBK 1823,TABLE PAGE,TABLE IV vs A Data 60, TABLE V Model parameters for semi automated inspections 72. TABLE VI Calculation comparing inspection A1 with J3 82. TABLE VII Mean vectors and covariance matrices for inspections etc 86. TABLE VIII One way MANOVA comparing 10 inspections etc 87. TABLE IX One way MANOVA excluding inspection J3 in Table V etc 87. TABLE X vs a data for web bore surfaces flaws etc 89. TABLE XI Model parameters for semi automated inspections 89. TABLE XII Analysis of variance table 91,TABLE XIII ANOVA for model parameter 91.
TABLE XIV ANOVA for model parameter 92,TABLE XV Analysis of means 93. TABLE XVI MANOVA for model parameters and H3 4 4 94. TABLE XVII MANOVA for model parameters and H3 4 5 95. A Eddy Current Test Systems 20,B Fluorescent Penetrant Testing Systems 24. C Ultrasonic Testing Systems UT 29,D Magnetic Particle Testing 34. E Test Program Guidelines 37,F Fabrication Documentation Maintenance 46. G Modeling Probability of Detection 58,H Assessing System Capability 77.
J Example Data Reports 96,MIL HDBK 1823, This handbook applies to all agencies within the DoD and industry involving methods for testing. and evaluation procedures for assessing Non Destructive Evaluation NDE system capability. This handbook is for guidance only This handbook cannot be cited as a requirement If it is. the contractor does not have to comply,INCLUDE TEST CASES FOR EACH OF THE APPROACHES. 1 2 Limitations, This handbook provides uniform guidance requirements for establishing NDE procedures used. to inspect new or inservice hardware for which a measure of NDE reliability is required They. are specifically Eddy Current EC Fluorescent Penetrant PT Ultrasonic UT and. Magnetic Particle MT Testing This document may be used for other NDE procedures if they. are similar in output to those listed herein such as Radiographic testing Holographic testing. Shearographic testing etc,1 3 Classification, NDE systems are classified into either of two categories those which produce only qualitative. information as to the presence or absence of a flaw i e hit miss data and systems which. also provide some quantitative measure of the size of the indicated flaw i e vs a data. 2 APPLICABLE DOCUMENTS,2 1 General, The documents listed below are not necessarily all of the documents referenced herein but are.
the ones that are needed in order to fully understand the information provided by this handbook. 2 2 Government documents,2 2 1 Specifications standards and handbooks. The following specifications standards and handbooks form a part of this document to the. extent specified herein Unless otherwise specified the issues of these documents are those. listed in the latest issue of the Department of Defense Index of Specifications and Standards. DoDISS and supplement thereto,DEPARTMENT OF DEFENSE. MIL STD 410 Nondestructive Testing Personnel Qualification and. Certification Cancelled see NAS 410,MIL STD 1783 Engine Structural Integrity Program. JSSG 87221 Aircraft Structures General Specification for. Unless otherwise indicated copies of the above specifications standards and handbooks are. available from the DoDSSP Bldg 4D 700 Robbins Ave Philadelphia PA 19111 5094. MIL HDBK 1823,2 3 Non Government publications, The following document s form a part of this document to the extent specified herein Unless. otherwise specified the issues of the documents which are DoD adopted are those listed in the. latest issue of the DoDISS and supplement thereto, ANSI ASNT CP 189 ANST Standard for Qualification and Certification.
of Nondestructive Testing Personnel,Box Hunter and Hunter Statistics for. Experimenters Wiley 1978, SNT TC 1A Personnel Qualification and Certification in Non. Destructive Testing American Society for,Nondestructive Testing ASNT 1983. UDR TR 88 12 Berens Hovey Donahue and Craport User s. Manual for Probability of Detection University of,Dayton Research Institute January 1988. Non Government standards and other publications are normally available from organizations. that prepare or distribute documents These documents also may be available in or through. libraries or other informational services,2 4 Order of precedence.
In the event of a conflict between the text of this document and the references cited herein the. text of this document takes precedence Nothing in this document however supersedes. applicable laws and regulations unless a specific exemption has been obtained. 3 DEFINITIONS, a flaw size Actual physical dimension of a flaw can be its depth surface. length or diameter of a circular or radius of semi circular or. corner flaw having the same cross sectional area, a hat Measured response of the NDE system to a flaw of flaw size a. Units depend on inspection apparatus and can be scale divisions. counts number of contiguous illuminated pixels or millivolts. a50 Flaw size at 50 POD, dec decision threshold Value of above which the signal is interpreted as a hit and. below which the signal is interpreted as a miss It is the value. associated with 50 POD Decision threshold is always. greater than or equal to inspection threshold, sat saturation Value of as large or larger than the maximum output of. the system or the largest value of that the system can record. MIL HDBK 1823, th signal or Value of below which the signal is indistinguishable from.
inspection threshold the noise or the smallest value of that the system records. Inspection threshold is always less than or equal to decision. 0 1 Intercept and slope of the linear relationship between Log. 0 1 and Maximum likelihood estimators of parameters 0 1. censored data Signal response either smaller than th and therefore. indistinguishable from the noise left censored or greater than. sat right censored and therefore a saturated response. crack A subset of flaws, d A calculated flaw depth estimated from its signal response. Standard error of residuals of regression of Log on Log a. ET Eddy current testing, factor A variable whose effect on POD a is to be evaluated. false call An NDE system response interpreted as having detected a flaw. but associated with no known flaw at the inspection location. flaw An imperfection or discontinuity that may be detectable by. nondestructive testing inspection and is not necessarily rejectable. hit An NDE system result interpreted as having detected a flaw. inspector The person who actually applies the NDE technique interprets the. results and determines the acceptance of the material per the. applicable specifications The inspector must be certified to the. same level required for production inspectors per MIL STD 410 or. SNT TC 1A for the NDE technique being applied, maximum likelihood A standard statistical method used to estimate numerical values. estimation for model parameters 0 1 and, miss An NDE system response interpreted as not having detected a. MT Magnetic particle testing, NDE Nondestructive evaluation which encompasses both the.
inspection itself and the subsequent statistical and engineering. analyses of the inspection data, NDE system A collection that can include hardware software materials and. procedures intended for the application of a specific NDE test. MIL HDBK 1823, method NDE systems can range from fully manually operated to. fully automated, noise Signal response containing no useful flaw characterization. information,POD Probability of detection, POD a probability The fraction of flaws of nominal flaw size a which are. of detection expected to be detected found,PT Fluorescent penetrant testing.
residual The difference between an observed signal response and the. response predicted from the model, system operator The person in charge of an automated or semi automated. system and who is responsible for the mechanical electrical. computer and other systems being maintained in proper. operating condition The system operator should be certified to. the same level required for production inspectors per MIL STD. 410 or SNT TC 1A for the NDE technique being applied. test monitor The person assigned to monitor the system reliability testing per. this document and to assure that all requirements of this. standard are being met,UT Ultrasonic testing,ADD TRANSFER FUNCTION DEFINTION. 4 GENERAL REQUIREMENTS,4 1 General, Need to include general overview of the POD process and approaches to get there. somewhere in the document, This section addresses the general requirements for assessing the capability of an NDE. system in terms of the probability of detection POD as a function of flaw size a These. general requirements are applicable to all NDE systems of this handbook and addresses. responsibilities for planning conducting analyzing and reporting NDE reliability evaluations. Specific requirements that pertain to eddy current test ET fluorescent penetrant test PT. ultrasonic test UT and magnetic particle test MT inspection systems are contained in. Appendices A through D, ADD a not too complicated FLOW CHART THAT DEFINES USE OF MAPOD XFER.
HIT MISS or Ahat vs a, Need to include descriptions of the different approaches. 4 2 System definition and control, Evaluation of the NDE system in terms of the limits of operational parameters and range of. application and demonstrate that the system is in control In addition to the physical. attributes of the NDE system this may include planned statistical assessments of those. components responsible for system variability,MIL HDBK 1823. 4 3 Demonstration design, To ensure that the assessment of the NDE system is complete suitable documentation may be. developed which specifies the experimental design for the inspections the method of. obtaining and maintaining the structural specimens to be inspected the procedures for. performing the inspections and the process for ensuring the inspection system is under control. The topics that may be addressed in each of these areas include the following. MIL HDBK 1823,4 3 1 Experimental design, The prime objective of an NDE reliability demonstration is to determine the POD versus.
flaw size relationship which defines the capability of an NDE system under representative. application conditions Variation in NDE system response and hence uncertainty in. detectability is caused by both the physical attributes of a flaw and the NDE process. variables or parameters The uncertainty caused by differences between flaws is accounted. for by using representative specimens with flaws of known size in the demonstration. inspections see 4 3 2 The uncertainty caused by the NDE process is accounted for by a. test matrix of different inspections to be performed on the complete set of specimens If the. experiment is properly designed and executed a secondary objective of identifying those. factors which significantly influence POD for the system can also be met. a The experimental design defines the conditions related to the NDE process parameters. under which the demonstration inspections will be performed In particular the experimental. design comprises, 1 The identification of the process variables which may influence flaw detectability but. cannot be precisely controlled in the real inspection environment. 2 The specification of a matrix of inspection conditions which fairly represents the real. inspection environment by accounting for the influencing variables in a manner which permits. valid analyses, 3 The order for performing the individual inspections of the test matrix The number of. flawed and unflawed inspection sites in the experiment could also be considered as part of. the experimental design and this topic is addressed in 4 3 2 1. b Although general guidelines for these areas are presented in the following. paragraphs it is recommended that a qualified statistician participate in the preparation of. the experimental design,4 3 1 1 Test variables, It is assumed that the inspection process has been defined and is under control for the. demonstration testing Even so there will be factors which cannot be completely. controlled or can only be controlled within reasonable operational limits To evaluate the. inspection system in the application environment these factors may be identified so that. they can be fairly represented in the demonstration tests For example in a manual. inspection it would not be acceptable to use only the known best inspector in the. demonstration tests Rather the entire population of inspectors may be represented as is. discussed in 4 3 1 2, a The contractor may generate a list of process variables which can be expected to. influence the efficacy of the NDE system This list may provide the basis for generating the. evaluation test matrix To assure a thorough evaluation it is recommended that the initial. matrix include as many variables as possible If early in the test program it is demonstrated. that a particular variable is not significant it may be eliminated from further consideration thus. resulting in a revised smaller test matrix To be eliminated it may be shown that the. variable has no significant effect on POD using the analysis methods as specified in. Appendices G and H The government reserves the right to expand or reduce the list of. variables to be included in the test matrix, b As a minimum the following types of variables should be considered in generating the.
list of test variables,MIL HDBK 1823, 1 Part preprocessing This variable type includes factors such as part cleaning. preparation contour and surface condition It could also include such things as the. application of the penetrant for fluorescent penetrant readers Early in the definition of the. system acceptance test plan a decision may be made as to how far upstream the. requirements should extend For a penetrant reading system it may be determined not to. consider the penetrant application as a variable and every effort should be made to hold. that as a constant for all systems being compared If however a new system is being. evaluated specifically because it may be less sensitive to pre processing variables these. variables should be included in the test plan The range of the variables to be considered in. this case should be those allowed by the procedures used at the application site. 2 Inspector In many applications the human conducting the inspection is the most. significant variable in the process Conversely some inspection systems have been. demonstrated to be very inspector independent The test plan should include the inspection. results obtained by several operators selected at random from among the population eligible. to conduct the inspections Eligibility may be defined in terms of some particular certification. training or physical ability, 3 Inspection materials Particular chemicals concentrations particle sizes and other. material dependent variables may be used in a given inspection For example PT. inspections will use penetrants emulsifiers and developers each of which may have a. significant impact on inspection capability System evaluation may be conducted. considering the range of materials expected to be used in production If different penetrants. for example are used the penetrant should be considered as a variable in defining the. test matrix If the operating procedures for the system preclude the use of alternate. penetrants others need not be included but this restriction clearly limits the generality of the. system assessment, 4 Sensor If the sensor used in the inspection system is replaceable or if different. sensors are used for different applications of the system such as is the case for eddy current. or ultrasonic inspections sensors should also be a variable in the test matrix The sensors. used in the demonstration tests may be selected at random from a production lot Sensor. designs typical of each planned for use with the system should be included in the test plan. with several of each being evaluated, 5 Inspection setup Calibration Electronic inspection processes in particular require. instrumentation adjustments to assure the same sensitivity inspection independent of time or. place To evaluate the potential variation introduced to the inspection process by this. calibration operation the test matrix should include calibration repetitions allowing random. variations that are consistent with the process instructions If more than one calibration. standard is available e g production sets the effect of the variation between. standards should also be considered as a test variable by repeating the specimen. inspection after calibrating on each of the available standards. 6 Inspection process The inspection process specifies controls on such inspection. parameters as dwell time current direction scan rates and scan path index The system. test matrix should include evaluation of these parameters If an allowable range is. specified the test plan should evaluate the inspection at the extreme of this range If the. parameter is automatically to be held constant repetitions of the basic inspection may be. sufficient evaluation of this variable,MIL HDBK 1823.
4 3 1 2 Test matrix, The contractor should generate a test matrix to be used in the reliability demonstration The test. matrix is a list of planned process test conditions which collectively define one or more. experiments for assessing NDE system capability A process test condition is defined as a set. of specific values for each of the process variables deemed significant see Appendix E The. complete set of test specimens should be inspected at each test condition of the test. matrix The complete matrix can comprise more than one experiment to allow for. preliminary evaluation of variables which may only marginally influence inspection response. of the system To the extent possible the individual inspections of a single experiment. should be performed in a random order to minimize the effects of all uncontrolled factors. which may influence the inspection results, a The inspection test conditions are to be representative of those that will be present at the. time of a future inspection Therefore to eliminate potential bias the values assigned to each. test variable in a test condition may be selected at random from the population of possible. values for that variable For example if a future inspection is to be performed by any of a. given population of inspectors and three inspectors are to be included in the experiment then. the three inspectors should be chosen at random from the population Similarly if two different. probes of identical design are to be used in the experiment they should be selected at. random from the population of probes Note that if the population of probes or inspectors. includes those not yet available it may be assumed that the available probes or inspectors. are representative of those that may be obtained in the future. b The analysis methods for combining multiple inspections in the calculation of a. single POD a function with confidence limits requires that the levels of all of the variables be. balanced This is most easily achieved when the test matrix comprises a full factorial. experiment in which all combinations of all levels of the variables are in the test matrix It is. readily apparent that factorial experiments can rapidly lead to very large test matrices There. are other methods of designing balanced experiments in the statistical literature which do not. require all combinations of the levels of the variables see Appendix E and Box Hunter and. Hunter 1978 These can and should be employed when necessary. c In general a final test matrix is a compromise between the number of variables that can. be included the number of levels values for each of the variables and the available time and. money To ensure that all desired objectives of the demonstration can be met it is imperative. that all trade offs be evaluated before inspections begin. d It should also be noted that experiments to evaluate the effects of inspection process. parameters on POD can be designed and analyzed using the methods of appendices E G. and H Such experiments should be performed prior to the capability demonstration as a. planned approach to optimizing the process,4 3 2 Test specimens. The test specimens may reflect the structural types that the NDE process will see in application. with respect to geometry material part processing surface condition and to the extent. possible flaw characteristics Since a single NDE process may be used on several structural. types multiple specimen sets may be required in a reliability assessment The contractor. should determine the characteristics of the test specimens required for the demonstration and. recommend the required number of flawed and unflawed specimens All test specimens. available to the contractor should be evaluated to determine if existing test sets meet the. requirements of the reliability demonstration The contractor should insure that the specimens. should not become familiar to the inspectors or inspection system Specimens which have. MIL HDBK 1823, become familiar to the inspectors or the inspection system will bias the resulting POD a curves. and so will be considered as unsuitable for reliability demonstration When necessary new. specimen sets should be designed and fabricated to meet the requirements A plan for. maintaining and re validating the specimens should be established All of these results should. be documented in the Demonstration Design Document The following subparagraphs present. minimum considerations in obtaining and maintaining the demonstration test sets Further. guidelines for fabricating documenting and maintaining test specimens are presented in. Appendix F, 4 3 2 1 Flaw sizes and number of flawed and unflawed inspection sites.
The statistical precision of the estimated POD a function depends on the number of inspection. sites with flaws the size of the flaws at the inspection sites and the basic nature of the. inspection result hit miss or magnitude of signal response Unflawed inspection sites are. necessary in the specimen set to insure integrity and to estimate the rate of false indications. The following recommendations are made regarding these topics. a The flaw sizes should be uniformly distributed on a log scale covering the expected range. of increase of the POD a function Cracks which are so large that they are always found or. saturate the recording device or so small that they are always missed or yield a signal which is. obscured by the system noise provide only limited information concerning the POD a function. Since the region of increase of the POD a function is initially unknown only engineering. judgment can be made regarding this range of increase It should be noted that there is a. tendency to include too many large flaws in NDE reliability demonstrations. b To provide reasonable precision in the estimates of the POD a function experience. suggests that the specimen test set contain at least 60 flawed sites if the system provides only. hit miss results and at least 40 flawed sites if the system provides a quantitative response to. c To allow for an estimate of the false call rate it is recommended that the specimen set. contain at least three times as many unflawed inspection sites as flawed sites An unflawed. inspection site need not necessarily be a separate specimen If a specimen presents several. locations which might contain flaws each location may be considered an inspection site To be. considered as such the sites may be independent that is knowledge of the presence or. absence of a flaw at a particular site may have no influence on the inspection outcome at. another site It is advisable to have at least 10 20 unflawed specimens for PT testing. 4 3 2 2 Physical characteristics of the test specimens. The final geometry of the specimen should represent to the NDE method to be used the same. degree of difficulty as the critical areas of the components to be inspected Specimens may. represent the shapes of the actual hardware for inspections where problem manipulation or. inspection media such as magnetic field sound waves and line of sight are geometry. dependent Bolt holes flat surfaces fillets radii and scallops are some typical shapes that. influence inspections Residual stress may influence the inspection due to configuration. Another geometric consideration for all inspection techniques is flaw location for example. corner flaws versus surface cracks Flaw location on specimens may be oriented and. positioned to represent actual parts, a The initial geometry of the specimen should allow the insertion of flaws of the required. shape and size in the specified locations The specimen should be designed such that the. required flaws can be inserted and then the final geometry can be obtained by machining or. other forming methods that will also retain the flaws of the necessary size shape and. MIL HDBK 1823, orientation and be within 0 002 inches of the intended locations Specimens should be. manufactured to tolerances typical of the component they represent. b For UT ET PT and MT methods the contractor should select alloys material forms and. raw material processing that represent the physical properties of the components to be. inspected significant to the NDE method being evaluated For example if an actual part is. made of INCO 718 forged to near finished shape the specimen should be made of INCO 718. and fabricated by the same processes In addition for ultrasonic inspection the internal noise. and attenuation should be as defined by the statement of work for the components to be. inspected For magnetic particle inspection the magnetic properties should be comparable to. the components to be inspected, c The processing forged cast or extruded of the raw material and the heat treat are critical. to insure that the specimen simulates the same metallurgical properties as the actual part. Surface condition of the final product and specimen will influence all inspection signal to noise. ratios Some examples are as follows Grain size can have a large influence on signal to noise. ratio for ET and UT and magnetic field for MT Also processing can develop mechanical. properties which can influence PT results Material strength can influence the amount of smear. metal which can obscure defects from penetrant inspection and residual compressive stress. may influence PT or UT Residual stresses can also be influenced by flaw propagation flaws. grow to relieve the stress field in which they reside and final machining Final machining of the. specimen should be consistent with final machining of the part The surface finish of the. specimen and actual part should be consistent so that the common surface finish between. specimen and part provide similar signal responses For example if the part is turned on a. lathe the specimen should be turned on a lathe whenever possible If the surface texture of the. part and specimen are not similar for instance record groove finish on the part due to lathe. turning and ground finish on the specimen from grinding the false call rate may be higher on the. parts due to the macro finish of record groove even though the micro surface finishes are. 4 3 2 3 Specimen maintenance, The contractor should derive a plan for protecting the specimens from mechanical damage and. contamination that would alter the response of the NDE process for which they are used This. plan would require as a minimum that the specimens be. 1 Individually packaged in protective enclosures when not in use. 2 Carefully handled when in use, 3 Cleaned immediately and returned to the protective enclosure after each use.
4 Re validated at intervals specified by the contracting agency when the specimens are. intended for periodic usage,4 3 2 3 1 Specimen flaw response measurement. Specimen flaw responses will be measured periodically by the contractor as monitored by the. appropriate procuring activity using the same test technique and procedure used in the original. specimen verification see Appendix F The flaw response may fall within the range of the. responses measured in the original verification process If it does not the results may be. examined to consider if they are acceptable if the specimen has been unacceptably. compromised or if the specimen needs to be re characterized and verified.

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