What is the role of boost pumps in aircraft fuel systems?

The role of boost pumps in aircraft fuel systems primarily involves ensuring proper fuel flow under all conditions. Boost pumps are designed to maintain a consistent and adequate fuel supply to the engines, particularly during critical phases such as start-up, low throttle settings, or when fuel levels are low. They help maintain fuel pressure and prevent the occurrence of vapor locks and cavitation, which could lead to engine performance issues.

By providing a reliable flow of fuel, these pumps ensure that the fuel system operates effectively in various operational conditions, including changes in altitude and pressure, which could affect fuel availability and flow characteristics. Boost pumps are especially vital in ensuring that the fuel reaches the fuel control unit of the engine at the correct pressure and flow rate, which is essential for optimal engine performance and reliability.

Overall, their function is critical in maintaining fuel circulation and pressure consistency, ensuring the front-line operations of the aircraft's fuel system are efficient and reliable.