Derated Climb Trajectories for Subsonic Transport Aircraft

Paper i proceeding, 2009

Minimising the overall operating cost with regard to engine deterioration during takeoff by using derated takeoff thrust is well understood by aircraft and engine manufacturers. Some aircraft have the possibility to use derated climb thrust as well, which is not always fully understood by the operators. The possibility of using derated climb thrust for reducing maintenance costs is discussed. It is shown that by using derated climb thrust D2, the HPT blade life can be increased by 7 % at the expense of a 0.7 % increase in fuel consumption during the climb phase, affecting the overall flight mission fuel consumption by approximately 0.1 %.