MIL-STD-781 Revision D:1986

Paragraph
1 Scope
1.1 Purpose
1.2 Application
1.3 Equipment categories
2 Referenced documents
2.1 Government documents
2.1.1 Standards and handbooks
3 Definitions
3.1 Terms
3.1.1 Contractor
3.1.2 Corrective maintenance (repair)
3.1.3 Decision risks
3.1.3.1 Consumer's risk (beta)
3.1.3.2 Producer's risk (alpha)
3.1.3.3 Discrimination ratio (d)
3.1.4 Failures
3.1.4.1 Multiple failures
3.1.4.2 Pattern failures
3.1.4.3 Chargeable failure
3.1.5 Failure categories
3.1.5.1 Equipment design failure
3.1.5.2 Equipment manufacturing failure
3.1.5.3 Part design failure
3.1.5.4 Part manufacturing failure
3.1.5.5 Software error failure
3.1.6 Measures of reliability
3.1.6.1 Demonstrated MTBF interval (theta d)
3.1.6.2 Observed MTBF (theta^)
3.1.6.3 Lower test MTBF (theta 1)
3.1.6.4 Upper test MTBF (theta 0)
3.1.6.5 Predicted MTBF (theta p)
3.1.6.6 Observed cumulative failure rate ((P(t))
3.1.6.7 Intensity function (rho (t))
3.1.6.8 Instantaneous MTBF function (M(t))
3.1.6.9 Observed reliability (R(t))
3.1.7 Mission profile
3.1.8 Life-cycle profile
3.1.9 Procuring activity
4 General requirements
4.1 Reliability test program
4.2 Integrated reliability test planning
4.3 Environmental test conditions
4.3.1 Combined environmental test conditions
4.3.1.1 Electrical stress
4.3.1.2 Vibration stress
4.3.1.3 Thermal stress
4.3.1.4 Moisture
4.3.1.5 Equipment cycling
4.4 Test instrumentation and facilities
4.4.1 Tolerance of test environments
4.4.2 Calibration of test apparatus
4.5 Performance baselines
4.5.1 Pretest performance
4.5.2 Performance during test
4.5.3 Post-test performance
4.6 Failure reporting, analysis, and corrective
         action system (FRACAS)
4.6.1 Problem and failure action
4.6.1.1 Problem and failure reporting
4.6.1.2 Identification and control of failed items
4.6.1.3 Problem and failure investigations
4.6.1.4 Failure verification
4.6.1.5 Corrective action
4.6.1.6 Problem and failure tracking and closeout
4.7 Failure categories
4.7.1 Relevant failures
4.7.2 Nonrelevant failures
4.7.3 Chargeable failures
4.7.4 Nonchargeable failures
4.7.5 Alternate failure categories
4.8 GFE
5 Detail requirements
5.1 Task descriptions
6 Notes
6.1 Tailoring of task descriptions
6.1.1 Details to be specified
6.2 Method of reference
6.3 Data Item Descriptions (DID)
6.4 Subject term (key word) listing
Tasks
Task section 100. Test planning and control
Task
101 Integrated reliability test plan document
102 Reliability test procedure
103 Reliability growth planning
104 Test program reviews
105 Joint test group
106 Reliability test reports
Task section 200. Development testing
Task
201 Survey testing
202 Reliability development/growth test
Task section 300. Reliability accounting tests
301 Reliability qualification test
302 Production reliability acceptance test
Task section 400. Environmental stress screening
401 Environmental stress screening
Figures
1 Example of failure categories
103-1 Reliability growth profile (example)
401-1 Random vibration spectrum

Describes reliability test requirements during the development, qualification and production of equipment and systems. Coverage includes, equipment categories, referenced documents, definitions, reliability test program, electrical stress, vibration stress, thermal stress, moisture, equipment cycling, failure verification, problem and failure reporting. Also gives detailed diagrams.