Where is IDG heat exchanger return fuel routed after the fuel return valve?

The correct response regarding the routing of IDG (Integrated Drive Generator) heat exchanger return fuel is to the wing tank outer compartments. In the A320 aircraft design, the heat generated during the operation of the IDGs is transferred to the fuel used for cooling. This heated fuel needs to be routed effectively to ensure continuous engine operation, cooling, and safety.

By directing the return fuel to the wing tank outer compartments, the system helps maintain an appropriate temperature of the fuel being used. The outer compartments are designed to handle the additional heat load without compromising fuel quality or system efficiency.

In this configuration, the positioning aids in optimizing fuel flow, minimizing the risk of overheating, and ensuring that the engine maintains its operational capabilities. Understanding this helps with awareness of fuel system management and temperature control critical to aircraft operations.