The pneumatic system uses pressurized air from different sources and sends it to its related systems. The pneumatic system also monitors the pressure and the temperature of the pressurized air.

The pneumatic system uses pressurized air that is supplied by the engines, the auxiliary power unit (APU), or by a ground cart through the pneumatic ground connection.

The pneumatic system is controlled by two bleed management controllers (BMCs). Indications for the pneumatic system are shown on the Engine Indication and Crew Alerting System (EICAS).

The distribution system supplies pressurized air to the air-conditioning system, the engine start system, the wing anti-ice system, and the cowl ant-ice system. These systems control the pressurized air through ducts, shut off valves, check valves, and other valves.

The indicating system displays messages if an overheat condition occurs in the bleed ducts, the anti-ice ducts, and the APU ducts. This system also monitors the parameters of the bleed air pressure in the ducts and the position of most of the valves. All the messages related to these parameters are shown on the EICAS display, glareshield, and overhead control panel. Lights and aural warnings also give indication of a leak.