Abstract: An energy absorber system for aircraft survivability. The energy absorber system includes energy absorbers providing energy absorption in a plurality of occupant weight ranges, said system providing a controlled range of dynamic response index (DRI) and of lumbar load level in one of said occupant weight ranges and greater energy absorption stroke distance in one of said occupant weight ranges as the occupant weight increases toward its maximum value for the weight range.

Abstract: A helicopter safety system provides an increased likelihood of survivability without injury during "survivable" helicopter crashes. The system provides spinal compression for precompressing an operator's spine in response to a crash signal from a crash sensor. Also included is a strap tensioning device which tensions an inertia reel strap and thus restraining the operator's upper body more effectively in the helicopter seat. Preferably, the strap tensioning device is initiated simultaneously with the spinal compression. Also included are energy absorbers connected to the seat pan, for example, between the seat pan and the seat frame, and airbags connected to the harness. The harness also includes a cross coupling element to provide for a lateral support configuration.