What does a flight engineer do on a space shuttle?

A flight engineer on a space shuttle is responsible for monitoring and managing the spacecraft's systems during launch, flight, and landing. They assist the commander and pilot by performing checks on critical systems, troubleshooting any issues that arise, and ensuring the shuttle operates safely and efficiently. Additionally, flight engineers may handle communication with ground control and oversee specific mission tasks related to payload operations and equipment. Their role is crucial for the overall success and safety of the mission.