This project is the second stage of a multi-stage structural refurbishment program for the Air Force's F/A-18 Hornet fleet. The centre barrel is the primary load bearing structure in the Hornet fuselage for the transfer of flight loads from the wings to the fuselage, and is the most significant component of the Hornet airframe in terms of aircraft life. This project is replacing the centre barrels of selected aircraft and undertaking other structural refurbishment work to extend the fatigue life of the Hornet aircraft.