The air conditioning system uses hot pressurized bleed air from the engines (temperature and pressure regulated by the bleed system), the auxiliary power unit or an external air source to provide a controlled atmosphere in the aircraft for flight crew and passenger comfort.

The air conditioning system keeps the air for the flight crew and the passengers clean and at the correct pressure and temperature. It uses the air supplied by the pneumatic system. It supplies the air to the flight compartment and to the forward and aft passenger compartments.

The air conditioning system is a dual system (two packs) each controlled automatically during all phases of operation by two air conditioning system controllers. The packs may also be controlled manually if there is an automatic mode failure or controller failure. The packs provide cold air, which is then blended with hot air to regulate the temperatures individually to the flight deck and cabin.

Individual temperature selections and system operation is controlled from the air conditioning panel on the cockpit overhead panel.