aircraft fatigue life expectancy faster than other missions. Airframe changes The forward fuselage is unchanged, but the remainder of the aircraft shares little with earlier F/A-18C/D models. The fuselage was stretched by to make room for fuel and future avionics upgrades and increased the wing area by 25%. However, the Super Hornet has 42% fewer structural parts than the original Hornet design. The General Electric F414 engine, developed from the Hornet's F404, has 35% additional thrust over most of the aircraft's flight envelope. The Super Hornet can return to an aircraft carrier with a larger load of unspent fuel and munitions than the original Hornet; this ability is known as "bringback", which for the Super Hornet is in excess of . Other differences include intake ramps for the engines and two extra wing hard points for payload (for a total of 11), retaining previous hardpoints on the bottom centerline, wingtips, and two conformal fuselage positions. Among the most significant aerodynamic changes are the enlarged leading edge extensions (LEX) that provide improved vortex lifting characteristics in high angle of attack maneuvers, and reduce the static stability margin to enhance pitching characteristics. This modification results in pitch rates in excess of 40 degrees per second, and high resistance to departure from controlled flight. Radar signature reduction measures Survivability is an important feature of the Super Hornet design. The U.S. Navy took a "balanced approach" to survivability in its design. It does not rely primarily on low-observability technology, but rather adopts improvements to its radar signature with other design innovations. The fighter also incorporates more advanced electronic-warfare capabilities, reduced ballistic vulnerability, greater employment of standoff weapons, and innovative tactics to collectively enhance crew and aircraft safety. The F/A-18E/F's radar cross-section was reduced greatly from some aspects, mainly the front and rear. The design of the engine inlets reduces the aircraft's frontal radar cross-section. The alignment of the leading edges of the engine inlets is designed to scatter radiation to the sides. Fixed fanlike reflecting structures in the inlet tunnel divert radar energy away from the rotating fan blades. The Super Hornet also makes considerable use of panel joint serration and edge alignment. Considerable attention has been paid to the removal or filling of unnecessary surface join gaps and resonant cavities. Where the F/A-18A-D used grilles to cover various accessory exhaust and inlet ducts, the F/A-18E/F uses perforated panels that appear opaque to radar