Seat for powered aircraft, the seat incorporating means for protecting its passenger in the event of a crash

A seat for a powered aircraft, the seat comprising a bucket held in hyperstatic manner on a stand, the bucket being made up of a seat with a seat back rising therefrom, and the stand comprising foot members for anchoring the seat in its utilization position on an installation plane (P), leg members being secured respectively to the foot members and together carrying the bucket pinned thereto via axially extending bolts, one of the ends of each bolt being engaged with a strength member of the seat back while the other end of each bolt engages a dedicated leg member, wherein the seat is fitted with a first hinged mechanism for geometrically compensating deformation of the floor, the mechanism associating a ball-joint connection between the bolts and one of the strength member of the seat back and the dedicated leg members, with the bolts being arranged to deform axially between opposing axial thrusts each of them applies against the strength member of the seat back and the dedicated leg member.