Mode of Failure Investigations of Helicopter Transmissions

Abstract

This report presents the results of the engineering review and analysis of failed parts rejected during UH-1 and CH-47 transmission overhaul at ARADMAC. The analysis included metallurgical and metrological examinations, the identification of failure modes, the computation of operating stresses, and the correlation of calculated with observed component lives. Tribological considerations were employed in the identification of failure modes and extensive use was made of special computer programs in the generation of failure data and the correlation studies. The study revealed that overhaul life is limited by a few parts whose failure rates exceed the mean by an order of magnitude. Areas of needed research and development to improve design capabilities are identified.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1971
Accession Number
AD0881610

Entities

People

  • C. W. Bowen
  • L. L. Dyson
  • R. D. Walker

Organizations

  • Bell Flight

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms
  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Aircrafts
  • Airframes
  • Bearing Rollers
  • Bearings
  • Computer Programming
  • Computer Programs
  • Computers
  • Engineers
  • Failure Mode And Effect Analysis
  • Finishes
  • Friction
  • Heat Treatment
  • Iron
  • Materials
  • Mechanical Engineering
  • Surface Roughness
  • Turbines

Fields of Study

  • Engineering

Readers

  • Systems Analysis and Design
  • Tribology (the study of the boundary interaction between sliding surfaces, lubrication, wear and friction).