Evaluation of Environmental Profiles for Reliability Demonstration

Abstract

This report describes the results of a 19-month study to determine the adequacy of the environmental profiles of MIL-STD-781, 'Reliability Tests: Exponential Distribution,' and provide recommendations for their improvement. The environmental and failure history of a sample of 95 avionic weapons replaceable assemblies (WRAs) served as the vehicle for this evaluation. Environmental data during demonstration testing and actual field exposure for each WRA was collected, analyzed, and compared. Test failure history and field failure experience were reviewed and reliability measures for each determined. Comparisons of lab-field reliability differences with environmental differences indicated that: insufficient thermal cycling; inadequate vibration testing in terms of level, duration and frequency; and lack of moisture exposures were deficiencies in the current environmental profiles. Recommended profiles which would eliminate these weaknesses are presented. In addition, the need for consistent ground rules, failure scoring criteria, and a strong end-item burn-in test are described.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1975
Accession Number
ADB007946

Entities

People

  • Allan Dantowitz
  • George Hirschberger

Organizations

  • Grumman

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Ground and Sea Platforms
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Aircraft Equipment
  • Aircrafts
  • Control Systems
  • Data Analysis
  • Databases
  • Detectors
  • Electronic Components
  • Failure Mode And Effect Analysis
  • Heat Transfer
  • Jet Aircraft
  • Jet Engine Noise
  • Measurement
  • Recording Systems
  • Test And Evaluation
  • Test Equipment
  • Test Methods
  • Turbojet Engines

Readers

  • Aerospace Test and Evaluation
  • Software Engineering
  • Structural Health Monitoring of Composite Structures.