Which stage of bleed air is the normal supply to the pneumatic system?

Which stage of bleed air is the normal supply to the pneumatic system?

• A. HP
• B. LP
• C. IP
• D. AP

Answer: (C)

Mid-stage bleed air is used as the normal supply for the pneumatic system. On the A320, the environmental control and pneumatic distribution are designed to run with bleed air from the intermediate-pressure (IP) bleed source, which provides the right balance of pressure and temperature for the packs and other pneumatic consumers. High-pressure bleed air is generally reserved for tasks that need higher pressure (such as engine start and some anti-ice functions), so it isn’t the normal supply. Low-pressure bleed air would not meet the pressure needs of the packs. The system can switch to HP bleed or APU bleed if IP bleed isn’t available, but IP bleed is the standard source during normal operations.

Mid-stage bleed air is used as the normal supply for the pneumatic system. On the A320, the environmental control and pneumatic distribution are designed to run with bleed air from the intermediate-pressure (IP) bleed source, which provides the right balance of pressure and temperature for the packs and other pneumatic consumers.

High-pressure bleed air is generally reserved for tasks that need higher pressure (such as engine start and some anti-ice functions), so it isn’t the normal supply. Low-pressure bleed air would not meet the pressure needs of the packs. The system can switch to HP bleed or APU bleed if IP bleed isn’t available, but IP bleed is the standard source during normal operations.