Accession Number:

ADA207506

Title:

OH-58 Energy Attenuating Crew Seat Feasibility Study

Descriptive Note:

Final rept. 28 Sep 1987-27 Sep 1988

Corporate Author:

BELL HELICOPTER TEXTRON INC FORT WORTH TX

Personal Author(s):

Report Date:

1988-11-01

Pagination or Media Count:

75.0

Abstract:

Special energy attenuating seats are used to provide a controlled deceleration over a vertical stroking distance to keep aircraft crash loads within human tolerance. Present energy attenuating crew seats use this approach of translating the entire seat vertically. This requires an area clear of equipment and structure between the seat and the fuselage floor. Installation of an energy attenuating seat in the OH-58 could provide reduced spinal loading in some crashes. However, the OH-58 crew seat is integral with the aircraft structure with no room for an energy attenuating seat which gave rise to the belief that a stroking energy attenuating seat was not technically feasible. An innovative approach was needed to provide such seats with a minimum of OH-58 structural modification. A pivoting seat pan design was conceived and feasibility study was performed for the U.S. Army to provide this preliminary design, fabricate test seats, and modify a dynamic test fuselage and a flyable aircraft. Dynamic testing was performed to prove the feasibility of the pivoting seat pan energy attenuating crew seat approach. This report discusses the approach which can provide energy attenuating crew seats to be installed in an OH-58, while providing a concept which could potentially provide similar solutions for other aircraft. Keywords Crashworthiness, Aircraft seats, Army helicopters, Protective equipment evaluation, Energy absorbers.

Subject Categories:

  • Helicopters
  • Protective Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE