anti crash seat for a member of crew of a helicopter comprises a tub (12) connected by a support structure (18) by an energy attenuateur reglable (44) of a bending type cable.the attenuateur (46) provides a framework for the basin, three parallel vertical steel cables (68, 70, 72) connected to the end part of the opposite attenuateur.a carriage assembly and a fixed (74) on the support structure containing three sets of three rollers (86, 88, 90) rotating around three axes, horizontal vertical spaces.around which the cables are bent and deplies three when the bucket is a crash down in a crash of the helicopter.the two lower rollers of the two sets of three rollers are deplacables along their axes between a position and a position reached by going a cable associated with thethe rolls.these rollers are deplacables connect has a mechanism for adjustment of the operating manual attenuateur (126) with a maximum control on which all rollers are engaged with their cableswith an intermediate control, that only two of the three sets of three rollers are engaged with their associated cables.a control cable is only a minimum of the set of three rollers, which is not connected to the adjustment mechanism.by selecting a control limit, a control mechanism and a minimum of adjustment through adjustment of the weight of the occupant of the seat.the maximum distance of collision is reduced without adversely affecting the protection provided in the seat against the dangerous forces of acceleration.
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