What is the aircraft takeoff weight that necessitates having a flight engineer?

The requirement for having a flight engineer is primarily linked to the complexity of operating larger aircraft, particularly in relation to their maximum takeoff weight. The threshold of more than 80,000 pounds is significant because this weight typically indicates that the aircraft requires additional operational support to ensure safety and efficiency during flight. Aircraft exceeding this weight often have multiple engines and intricate systems that demand meticulous monitoring.

As aircraft weight increases, so do the demands on the flight crew in terms of managing the aircraft systems, especially during critical phases like takeoff and landing. The flight engineer serves as an essential member of the flight crew, providing expertise in monitoring and managing systems which helps mitigate risks associated with flying heavier aircraft. Thus, aircraft over 80,000 pounds necessitate having a flight engineer to ensure that all systems are functioning correctly and to assist the pilot in operating the aircraft safely.