A flight engineer is a member of the flight crew responsible for monitoring and managing various aircraft systems during flight. The role of a flight engineer has evolved over time, and it is important to note that with advancements in aviation technology, the position of flight engineer has been reduced or eliminated on many modern aircraft.

On older or larger aircraft that require a flight engineer, the flight engineer is responsible for monitoring and managing systems such as engines, fuel systems, hydraulic systems, electrical systems, and environmental controls. They closely monitor instrument displays, gauges, and indicators to ensure optimal system performance. They also assist in engine management, including monitoring fuel flow rates, temperatures, and pressures, and making adjustments as necessary for efficient operations. In emergency situations, flight engineers assist in emergency procedures and take appropriate actions to ensure the safety of the aircraft and its occupants.