Patent ID: 8453970

Claim:
An aircraft comprising a cabin with an aircraft floor and an under-floor system for providing a functional space, in which functional elements are located, wherein the under-floor system comprises: at least one seat module and; at least one aisle module; wherein the at least one seat module comprises a support member structure comprising an aircraft seat and at least one self-supporting bar structure with a bottom surface facing an aircraft floor, a top surface facing the aircraft seat located above the self-supporting bar structure; wherein the at least one self-supporting bar structure extends along the longitudinal direction of the cabin; wherein at least one self-supporting bar structure is fastened to an aircraft structure element; wherein the at least one aisle module is located adjacent to at least one of said at least one seat module and comprises an aisle module cover element exchangably fastenable to the to surface of the self-supporting bar structure such that the cover element is spaced apart from the aircraft floor and such that an aisle of the cabin adjacent to the at least one of said at least one seat module extends across the aisle module cover element; wherein the cover element space apart from and arranged above the aircraft floor and forms a double floor, defining a functional space arranged at least between the aisle module cover element and the aircraft floor and in which functional space system lines are provided along the entire longitudinal direction of the cabin.