Accession Number : ADA138014

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

Corporate Author : ARMY AEROMEDICAL RESEARCH LAB FORT RUCKER AL

Personal Author(s) : Hundley,T A

PDF Url : ADA138014

Report Date : Oct 1983

Pagination or Media Count : 23

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.

Descriptors :   *HARNESSES, *STRAPS, SHOULDERS(ANATOMY), AIRCRAFT EQUIPMENT, HELICOPTERS, FAILURE(MECHANICS), TENSILE STRENGTH

Subject Categories : Helicopters
      Protective Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE