The following statement is true: It is not possible to use the APU in the anti-ice system with the Pneumatic system in AUTO, but it can be done with manual control of the bleed air system.

• A. True
• B. False
• C. Not enough information
• D. Only when on the ground

Answer: (B)

Bleed air sources for anti-ice come from the pneumatic system, and the system can use either engine bleed or APU bleed to supply that heat. In AUTO mode, the pneumatic system automatically selects the available bleed source to meet demand, including anti-ice needs. If the APU is running and its bleed is available, AUTO can route bleed air from the APU to the anti-ice system rather than relying solely on engine bleed. Manual control simply lets the crew explicitly choose a bleed source, but it isn’t the only way to power anti-ice with APU bleed. Therefore, the statement is not correct: you can use the APU bleed for anti-ice in AUTO when conditions allow.