Effects of Helicopter External Loads on Sling Properties

Abstract

Samples of webbing of the type currently used for slings to carry external cargo by Army helicopters are tested to determine which environmental factors contribute to premature failure of the webbing. The environmental factors include outdoor exposure, temperature, humidity, JP-4 and seawater immersion, sand, and vibratory loading. Several types of nylon and Dacron are tested. The results of these tests indicate that outdoor exposure has a major effect on webbing strength. The presence of sand between the yarns in the webbing produces early failure. Shackle FSN 1670-090-5354 causes severe damage to slings under vibratory loading if used without a protective pad. Temperature, humidity, fuel and seawater immersion, and indoor storage have a negligible effect on webbing strength.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1973
Accession Number
AD0774267

Entities

People

  • Arthur J. Gustafson Jr.
  • Edgar H. Mcilwean
  • Eugene A. Birocco
  • Max E. Bryan

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aircrafts
  • Elongation
  • Engineering
  • Failure Mode And Effect Analysis
  • Frequency
  • Helicopters
  • Laboratory Equipment
  • Materials
  • Materials Laboratories
  • Plastic Explosives
  • Radiation
  • Solar Radiation
  • Standards
  • Statistical Analysis
  • Sunlight
  • Test Fixtures
  • Test Methods

Readers

  • Logistics and Supply Chain Management.
  • Reinforced Composite Materials
  • Thermal Physics or Thermal Science.