UH-60 Shoulder Harness Lead-In Strap Failure Analysis,

Abstract

Shoulder harness lead-in strap failures have occurred in several UH-60 Blackhawk helicopter accidents with crewmembers being injured as a result. An investigation into possible failure causes was conducted. The two most likely causes found were incorrect installation of the seat insert guide and an increase in stress in the lead-in strap caused by the radius of bend at the point where the strap passes through the seat back. Test showed that incorrect installation of the seat insert guide caused a significant reduction in the failure load of the webbing. Tests also showed that a reduction in failure load occurred when the webbing was pulled over a radiused corner. The first problem was solved by removing and reinstalling the seat insert guides. The second problem can be dealt with by using a higher-strength lead-in strap.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1983
Accession Number
ADA138014

Entities

People

  • T. A. Hundley

Organizations

  • United States Army Aeromedical Research Lab

Tags

Communities of Interest

  • Biomedical
  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Aircrafts
  • Artillery
  • Biological Sciences
  • Biomedical Research
  • Engineering
  • Failure Analysis
  • Failure Mode And Effect Analysis
  • Health Services
  • Human Factors Engineering
  • Materials
  • Military Research
  • Safety Engineering
  • Security
  • Stress Concentration
  • Tensile Strength
  • Test Fixtures

Readers

  • Aviation Science / Aeronautics.
  • Exercise and Sports Science.
  • Structural Health Monitoring of Composite Structures.