How is the parachute opened?
Normally retaining pins on the parachutist and retaining lock wires on the parachute pack tray are used to hold the pack tray in the closed position. When the parachutist arms are moved to the extreme down the postion the retaining pins are retracted. The parachute pack tray is opened and the parachute deploys. A servo on a separate channel could also be used to deploy the parachute. I also use small rubberbands from the risers to the pack retaining lock wires to help open the pack tray.