The 777-300ER (“ER” for Extended Range) is the C-market version of the -300. It features raked and extended wingtips, a new main landing gear, reinforced nose gear, and extra fuel tanks.
It also has a strengthened fuselage, wings, empennage, and engine attachments.The -300ER is powered by the GE90-115B turbofan, which is the world’s most powerful jet engine in service, with a maximum thrust of 115,300 lbf (513 kN).
Its maximum range is 7,930 nautical miles (14,690 km), made possible by higher MTOW and increased fuel capacity. The -300ER can fly approximately 34 percent farther than the -300 with a full load of passengers and cargo. Following flight testing, aerodynamics refinements have reduced fuel burn by an additional 1.4 percent.
