Tuesday, April 27, 2010

Ariane-5 Booster Recovery System Secuence

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 <>

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