We often see warnings when we purchase skydiving gear.
For example, SSK sends a WARNNG that “one out of every 20,000-75,000 jumps results in death” “according to USPA…studies” That’s quite a broad estimation.
Further, they expect parachutes to malfunction “once in each 333 activations”.
I wonder if there has been any work done to make some estimation about the failure rate of mains vs. the failure rate of reserves? It seems to me that reserves would have a greater mean time between failures as a result of more positive openings with a spring-loaded pilot chute.
If mains and reserves have an equal failure rate of .003, then the parallel failure rate would be:
(.003)(.003)= .000009. In other words we could expect a double malfunction 9 times every million jumps, or once every 111,111 jumps.
I imagine that the “one out of every 20,000-75,000 jumps results in death” statistic is skewed by suicides and fatalities under functional parachutes (low turns, among others).
It seems that the military would be the folks most likely to maintain an accurate collection of such data, but I don’t see anything publicly listed.