Aircraft and Equipment Factors in the Occurrence of Suspension Line Twists with the T-10 and MC1-1B Parachutes.

摘要

Data was collected by self report from the trainees of two classes of the Basic Airborne Course at Fort Benning, Georgia, who were asked if they had developed twists in their suspension lines during each of the five jumps of the course. These data were then related to the conditions of deployment for each jump -- type of parachute used, type of equipment carried, type of aircraft jumped from, etc. The proportation of jumpers with twists during a given jump, with its associated conditions of deployment, was compared by the Chi-square test with the proportion of jumpers with twists from other jumps made under different conditions of deployment. Using this method, it was shown that there was no effect of type of parachute on the occurrence of twists but there was a strong and significant effect of combat equipment which is associated with an increase in the proportion of twists. There was, in addition, a significant, but slightly smaller, affect attributable to the type of aircraft used for jumps, with more twists occurring during jumps from the C-141 than during jumps from the C-123.