The F/A-18 Hornet Upgrade Air 5376 Phase 3.2 project is a structural modification project that is required to address structural deficiencies identified during the F-18 International Follow-On Structural Test Program. The project is divided into two structural refurbishment programs, each providing a different amount of fatigue life to the aircraft to allow the Hornet fleet to reach its Planned Withdrawal Date as explained below:

• A number of aircraft will have their centre barrels (the primary load bearing structure in the aircraft) replaced along with a few other discrete modifications and inspections providing continued airworthiness from 85% to 100% of the intended structural fatigue life. This program is called Structural Refurbishment Program (SRP) 2.

• The remainder of the Hornet fleet will undergo a range of other discrete structural modifications providing continued airworthiness from 78% to 85% of the intended structural fatigue life. This program is called SRP1D.