Enhanced motor cooling system and method

A dual mode method of operation of an Environmental Control System (ECS), comprising:

• providing a ram air system including a ram inlet and a ram outlet and a ram fan that draws air from the ram inlet to the ram outlet;
• connecting a cabin air compressor motor that includes including a motor cooling inlet passage and a motor cooling outlet passage to the ram air system such that the motor inlet cooling passage is connected to said ram inlet;
• connecting said cabin air compressor motor to a diverter valve, the diverter valve including a first diverter inlet, a first diverter outlet, and a second diverter outlet, such that the first diverter inlet is coupled to said motor cooling outlet passage,
• connecting the first second diverter outlet to the ram outlet;
• connecting the second diverter outlet to a dedicated outlet separate from the ram outlet;
• operating said diverter valve to provide fluid communication between the motor cooling outlet passage and the ram outlet via the second diverter outlet in a ground mode of operation;
• and
• operating said diverter valve to provide fluid communication between the motor cooling outlet passage and the dedicated outlet via the first diverter outlet said cabin air compressor motor and said dedicated outlet in a flight mode of operation.