What is the role of the electric boost pumps in the aircraft?

The role of electric boost pumps in an aircraft is primarily to provide fuel pressure for engine start. When an aircraft engine is starting, it requires a sufficient supply of fuel at the correct pressure for proper ignition and operation. The electric boost pumps facilitate this by drawing fuel from the tanks and ensuring that it reaches the engine at the necessary pressure levels. This is especially critical when the aircraft is at low fuel levels or when the engines are starting, as gravity or other means may not provide adequate fuel flow.

While the other options presented describe important functions in aircraft systems, they do not pertain specifically to the purpose of electric boost pumps. Hydraulic pressure is managed by hydraulic systems, fuel transfer between tanks is accomplished through transfer pumps or gravity flow, and engine cooling is typically handled by separate cooling systems and airflow mechanisms. Thus, the function of the electric boost pumps is accurately captured in the context of providing fuel pressure needed for the initial stages of engine operation.