EValuation of A Proposed B-2 Seat Cushion By + Gz Impact.
INTERIM REPT. MAY-OCT 96
ARMSTRONG LAB WRIGHT-PATTERSON AFB OH CREW SYSTEMS DIRECTORATE
Pagination or Media Count:
Optimal seat comfort is required for aircrew operational effectiveness in all USAF aircraft. Extended missions in ejection seat aircraft must balance comfort with the cushions influence on the risk of vertebral fracture during ejection. McDonnell Douglas and Northrop Grumman recently designed a proposed seat cushion for the ACES II ejection seat in the B-2 aircraft to improve sitting comfort. The Escape and Impact Protection Branch was requested by the San Antonio Air Logistics Center to evaluate potential spinal injury risk with the proposed cushion. A series of vertical impact tests were conducted with volunteer human subjects to compare the impact response of the proposed cushion to a no cushion impact condition, and to the existing B-2 ACES II seat cushion. All tests were conducted on the Armstrong Laboratorys Vertical Deceleratio Tower using a Gz peek impact of 100. Test results indicate that the human impact response with the proposed B-2 ACES II seat cushion is not significantly different from the response with no seat cushion or with the current B-2 ACES II seat cushion. This indicates that the current risk of spinal injury would not increase with the proposed cushion within the limits evaluated.
- Anatomy and Physiology