Ejection Under Deceleration.
NAVAL AIR DEVELOPMENT CENTER WARMINSTER PA CREW SYSTEMS DEPT
Pagination or Media Count:
The objective of this test program was to investigate the phenomenon of decelerative forces on the ESCAPAC 1A-1 ejection seat installed in the U.S. Navy A-4A, B, C and E series attack aircraft. This phenomenon may be encountered, for example, during actual ejection attempts coincident with loss of control on take-off coupled with heavy breaking, skidding andor failure of the nosegear or one main landing gear. Decelerative forces may also be present during arrested landings on carriers as well as emergency arrestments on hard-surfaced runways. It is concluded, that serious attention should be given to revising the technique presently incorporated in the ESCAPAC 1A-1 ejection seat for effecting seatman separation. Particular emphasis should be placed upon possible relocation of the SNUBBER line attachment points of the ejection seat which, it is felt, contributed to the unsatisfactory seatman separation characteristics demonstrated in this program. The reason for the repeated failure of the SNUBBER weak links to function properly should also be determined. Additionally, consideration should be given to replacing the present DARTSNUBBER stabilization-seatman separation subsystem with a current state-of-the-art subsystem that relies neither upon physical connections to the aircraft nor time lapse, dynamic displacement, corrective momentum inputs to achieve seat stabilization.
- Attack and Fighter Aircraft