What does Flex thrust primarily aim to achieve?

Flex thrust primarily aims to achieve the minimum amount of thrust necessary to safely operate the flight. This operational procedure is used to optimize engine performance while ensuring safety and performance standards are met during takeoff. By utilizing Flex thrust, the engines are set to a reduced thrust setting, which can help in scenarios where full power is unnecessary or where environmental considerations, such as noise reduction and fuel efficiency, are prioritized.

Using Flex thrust can also help airlines manage noise levels in areas near airports during takeoff, aligning with noise abatement procedures. However, the primary focus remains on providing just enough thrust to ensure safe operations under normal conditions, especially in instances where weight and runway length allow for a lower thrust takeoff.