Abstract: A cooling system is disclosed for a pod (20) of an aircraft. The cooling system includes an air circulation loop (28) for supplying cooled air to an air input (32) of the pod to cool a load disposed in the pod and for receiving air discharged from an air discharge (34, 35) to the pod which has absorbed heat from the pod. A cooling apparatus (30) is disposed in the loop which is activated to cool air flowing in the loop prior to application to the pod. A fan (48) is located in the air circulation loop between the cooling apparatus and the air discharge (35) which is activated to blow discharged air toward the cooling apparatus when the aircraft is operated in a first portion of the flight envelope. A ram air supply (44) supplies ram air in response to flight of the aircraft.