Recirculation ground maintenance mode

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

• delivering a first portion of cabin air from a cabin to a lower recirculation heat exchanger included in a lower cooling zone, the lower recirculation heat exchanger configured to convert a first portion of cabin air into lower cooled recirculated cabin air;
• delivering a second portion the cabin air from the cabin to an upper recirculation heat exchanger included in an upper cooling zone including, the upper recirculation heat exchanger configured to convert the second portion of cabin air into upper cooled recirculated cabin air;
• generating power via a power system;
• delivering the power from the power system to a lower recirculation fan included in the lower cooling zone;
• and
• and delivering the first portion cabin air to the lower recirculation heat exchanger in response to powering the lower recirculation fan
• 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 the 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,
• wherein in response to invoking the lower cooling zone, the controller commands the power system to deliver the power to the lower recirculation fan while commanding the power system to disconnect the power to the upper recirculation fan.