Recirculation ground maintenance mode

The aircraft air conditioning system of claim 2, further comprising:

• a manifold;
• a ram air circuit in fluid communication with the manifold,
• a pressurization air cycle kit (PACK) in signal communication with the power system to selectively receive the power;
• and
• wherein in response to invoking the recirculation ground maintenance mode, the controller commands the power system to disconnect the power to the PACK, and the manifold outputs cooled cabin supply air that is delivered to the cabin to reduce the cabin temperature.

A method of controlling an aircraft air conditioning system comprising, the method comprising:

• delivering cabin air to a lower recirculation heat exchanger included in a lower cooling zone;
• delivering the cabin air to an upper recirculation heat exchanger included in an upper cooling zone including, the upper recirculation heat exchanger configured to receive the cabin air from the cabin and to convert the cabin air into upper cooled recirculated cabin air;
• generating power via a power system;
• and
• determining, via a controller, a target temperature of the cabin;
• and
• invoking, via the controller, a recirculation ground maintenance mode to command the power system to deliver power to one or both of the lower cooling zone and the upper cooling zone so that a temperature of the cabin reaches the target temperature.