Which bleed source is the normal supply to the pneumatic system?

Which bleed source is the normal supply to the pneumatic system?

• A. HP
• B. LP
• C. IP
• D. APU bleed air

Answer: (C)

The air that feeds the pneumatic (air conditioning and related) system on the A320 is taken from the engine bleed air at the intermediate pressure stage. This IP bleed provides a stable, moderate-pressure supply that is ideal for the packs and pneumatic system’s needs. It keeps the higher-pressure HP bleed available for other functions such as engine anti-ice and starting. When engines are not running, or if IP bleed isn’t available, the system can switch to APU bleed or other sources, but under normal operation the IP bleed is the primary source. The HP bleed and LP bleed are not used as the normal supply for the pneumatic system, and LP bleed isn’t the standard source for these functions.

The air that feeds the pneumatic (air conditioning and related) system on the A320 is taken from the engine bleed air at the intermediate pressure stage. This IP bleed provides a stable, moderate-pressure supply that is ideal for the packs and pneumatic system’s needs. It keeps the higher-pressure HP bleed available for other functions such as engine anti-ice and starting. When engines are not running, or if IP bleed isn’t available, the system can switch to APU bleed or other sources, but under normal operation the IP bleed is the primary source. The HP bleed and LP bleed are not used as the normal supply for the pneumatic system, and LP bleed isn’t the standard source for these functions.