System and method for humidity-based performance adjustment in aircraft flight management systems

An aircraft comprising:

• one or more engines;
• and
• a flight management system (FMS) configured to:
• obtain first humidity data indicative of a first humidity value at an origin airport of a flight;
• obtain second humidity data indicative of a second humidity value at a destination airport;
• determine, based on the first humidity data, a first fuel flow rate adjustment of the one or more engines for a first phase of flight from a first altitude of the origin airport to a threshold altitude;
• determine, based on the second humidity data, a second fuel flow rate adjustment of the one or more engines for a second phase of flight from the threshold altitude to a second altitude of the destination airport;
• and
• estimate total fuel flow of the one or more engines for the flight based on the first fuel flow rate adjustment and the second fuel flow rate adjustment.

A line replaceable unit (LRU) comprising:

• one or more processors configured to:
• obtain first humidity data indicative of a first humidity value at an origin airport of a flight;
• obtain second humidity data indicative of a second humidity value at a destination airport;
• determine, based on the first humidity data, a first fuel flow rate adjustment for a first phase of flight from a first altitude of the origin airport to a threshold altitude;
• determine, based on the second humidity data, a second fuel flow rate adjustment for a second phase of flight from the threshold altitude to a second altitude of the destination airport;
• and
• estimate total fuel flow for the flight based on the first fuel flow rate adjustment and the second fuel flow rate adjustment.