Apparatus for reversing chiller airflow in an air chiller supply air recirculation system of an aircraft galley including at least one galley food cart having a galley food cart bay door, comprising: a galley chiller air supply and return ducting assembly including a supply airflow duct and a return airflow duct, said supply airflow duct having a supply airflow duct inlet portion configured to receive a chilled supply airflow from a chiller unit and a supply airflow duct outlet portion configured to deliver the chilled air to at least one galley food cart or cart bay, and said return airflow duct having an air return inlet portion configured to receive a return airflow from at least one galley food cart or cart bay and an air return outlet portion configured to deliver the return airflow to the chiller unit, characterized by: an air bypass port connected in fluid communication between said supply airflow duct and said return airflow duct; an air recirculation bypass flap movably mounted adjacent to said air bypass port, said air recirculation bypass flap being movable between a closed configuration and an open configuration, said closed configuration allowing normal airflow circulation through the supply airflow duct and said open configuration blocking at least a substantial portion of the chilled supply airflow to the supply airflow duct outlet portion and diverting at least a substantial portion of the chilled supply airflow to the return airflow duct for recirculation to the chiller unit; and a solenoid in the galley chiller air supply and return ducting assembly operatively connected to said electrically actuated air recirculation bypass flap and configured to move the air recirculation bypass flap between said closed and open configurations. a galley chiller air supply and return ducting assembly including a supply airflow duct and a return airflow duct, said supply airflow duct having a supply airflow duct inlet portion configured to receive a chilled supply airflow from a chiller unit and a supply airflow duct outlet portion configured to deliver the chilled air to at least one galley food cart or cart bay, and said return airflow duct having an air return inlet portion configured to receive a return airflow from at least one galley food cart or cart bay and an air return outlet portion configured to deliver the return airflow to the chiller unit, characterized by: an air bypass port connected in fluid communication between said supply airflow duct and said return airflow duct; an air recirculation bypass flap movably mounted adjacent to said air bypass port, said air recirculation bypass flap being movable between a closed configuration and an open configuration, said closed configuration allowing normal airflow circulation through the supply airflow duct and said open configuration blocking at least a substantial portion of the chilled supply airflow to the supply airflow duct outlet portion and diverting at least a substantial portion of the chilled supply airflow to the return airflow duct for recirculation to the chiller unit; and a solenoid in the galley chiller air supply and return ducting assembly operatively connected to said electrically actuated air recirculation bypass flap and configured to move the air recirculation bypass flap between said closed and open configurations. an air bypass port connected in fluid communication between said supply airflow duct and said return airflow duct; an air recirculation bypass flap movably mounted adjacent to said air bypass port, said air recirculation bypass flap being movable between a closed configuration and an open configuration, said closed configuration allowing normal airflow circulation through the supply airflow duct and said open configuration blocking at least a substantial portion of the chilled supply airflow to the supply airflow duct outlet portion and diverting at least a substantial portion of the chilled supply airflow to the return airflow duct for recirculation to the chiller unit; and a solenoid in the galley chiller air supply and return ducting assembly operatively connected to said electrically actuated air recirculation bypass flap and configured to move the air recirculation bypass flap between said closed and open configurations.