Patent ID: 7975967

Claim:
An automatic activation device for a parachute comprising, in at least first and second working configurations, a) pressure input means for input of at least a first pressure value corresponding to an actual atmospheric pressure value at a take-off zone, and a second pressure value corresponding to an atmospheric pressure value above a drop zone at a height when the second pressure value is input, b) multiple-input means for input of at least a QNH value and an elevation value, c) a processing element, connected to the pressure input means, operable for determining in the first configuration a reference pressure based on the first pressure value input, determining in the second working configuration a reference pressure based on the QNH value and elevation value, determining a series of subsequent pressure values based on the second pressure value in accordance with the reference pressure and at least two of the subsequent pressure values, determining a time value indicating an evaluated time for reaching the reference pressure, generating a correspondence signal upon. establishing that the evaluated time value has reached a predetermined value, determining, based on the series of subsequent pressure values, a first fall down speed, comparing the first fall down speed with a reference fall down speed under control of the correspondence signal, generating a control signal when the first fall down speed corresponds to or is higher than the reference fall down speed, d) an activation element, connected to the processing element, for activating opening of the parachute under control of a control signal generated by the processing element, and e) selection means enabling selection between at least the first and second working configurations.