The flight control indicator (1) comprises a set (2) of information sources, a computation unit (3) connected to said set (2) of information sources and determining, on the basis of information emanating from said set (2) of information sources, at least one maximum total slope of the aircraft, which corresponds to the maximum thrust and is obtained on the basis of the measurement of the current performance of the aircraft, extrapolated to the condition of maximum slope and anticipating an engine fault, and a head-up display device (5) which presents, on a display screen (7), at least one means of indication (8) which indicates said maximum total slope and which is presented superimposed on the environment existing in front of the aircraft.