I think the auto industry has gotten carried away with safety devices. The more safety devices the heavier the car the heavier the car the more safety devices needed. Bottom line ( NO LIFEGAURD ON DUTY ) I don't remember my sport parachute coming with a air bag incase of a double malfucntion. Rick
Speaking of safety devices and parachutes: Did you read about the who guy flew into IMC the other day and became disoriented (haven't we all?), picking up freezing rain and zooming up and down from FL 30 to 120 and finally crashing. He was in a Cirrus, the best plane in theory for this kind of misadventure, with its unique whole-plane parachute.
Sure, on examining the wreckage they found the plane's parachute deployed, but some miles away. Problem was, as you know the VNE for the Cirrus chute is 133 kts., and they reckon from the radar trace that he was doing at least 170 when he deployed it, so it broke away as it's designed to do in case of accidental deployment in normal flight. He must have had a warm fuzzy feeling as he reached for that lever:
SAVED! But only for a couple of seconds. As we used to say, you can make something fool proof, but not always bloody fool proof.
When I used to sport jump, back in the days when all we had were converted military T28s, the reserve chute had a neat device to deploy itself in the event that the main canopy failed and the jumper was either unconscious for some reason, or just froze in fear. A barometric device sensed when you passed through about 500 feet descending too fast, and the D-ring, one end of which was loaded into a little tube, was ejected by a small .22 blank cartridge, thus opening the pack. I recall that the parachute rigger had to set it up for the pressure altitude at the start of the day's fun. I never saw it operate, and often wonder if it really worked as there was really no way to test it except by needing it, like a fire extinguisher.