Abstract: An aircraft fuel management computer for notifying a pilot at a predetermined point of time to switch the fuel selector valve to begin draining fuel from a different fuel tank. A frequency divider provides a logic level at the end of time segments, each having a predetermined length, which are transmitted through an automatic/manual count circuit to activate a decoder to provide output logic levels each of which is coupled to the associated stages of a plurality of automatic program switches each preset to a position corresponding to a predetermined number of time segments. Each of the automatic program switches is coupled to a mode switch which may be set to one of the automatic program switches to time the usage of one of the fuel tanks of the aircraft for a period of time corresponding to the setting of the automatic program switch.