A passenger seat (100) that includes at least one back rest frame (191-194) with at least one through-hole, at least one lateral structural member (101,102) that is perpendicular to the at least one back rest frame (191-194) and is disposed in the at least one through-hole, and at least one floor attachment frame (195,196) with at least one through-hole that is coaxial with the at least one through-hole of the at least one back rest frame (191-194). Each lateral structural member include an internal composite tube (101,102) that extends a full lateral width of the passenger seat and a plurality of outer tubes (151-162) disposed on an outer surface of the internal composite tube.
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