
Altitude     Events (referenced to Fig)                          Initiated by
0            Launch phase (1)
+/- 10 km    Removal of first safety barrier in control system      Pressure
          (switching of baro relay) (1)
59 km        Booster separation from central stage (2)              Electrical signal
          Removal of second safety barrier in control system.    Supplied by booster
          Arming of safety device (BSA).
150 km       Culmination of ballistic phase (3)
8.5-27 km    Removal of third safety barrier in control system      Pressure
          (switching of baro relay), initiation of Altitude
          Determination System (ADS) (3)
4.8-5.2 km   Ignition of nose-cone release expandable tube (4)      Altitute from ADS
          Ignition of nose-cone separation pistons               Time delay from ADS
          Separation of nose cone                                Separation piston force
                                                                 + aerodynamic force
          Release and deployment of auxiliary parachute          Noise cone movement
          Release and deployment of drogue parachutes            Auxiliary parachute force
          De-reefing of three drogue parachutes,                 Built-in cable cutters
          in four steps (5)                                      with pyrotechnic delay
1320-2770 m  Activation of drogue strap release pyros and release   Time delay from ADS
          of drogue parachutes (6)
          Release and deployment of additional parachute (7 & 8) Drogue parachute force
1200-2640 m  Release and deployment of main parachute (7 & 8)       Drogue parachute force
          De-reefing of main parachute, in four in steps (9)     Built-in cable cutters
                                                                 with pyrotechnuc delay
0               Splashdown at v <>
More info:
http://esapub.esrin.esa.it/bulletin/bullet85/gigo85.htm