With the bleed valve control in the manual mode, is it possible to provide APU air to the Wing Ice protection system?

• A. Yes, APU air can be routed to Wing Ice system.
• B. False—Wing bleed valves will close and BLEED MISCONFIG message will appear on EICAS.
• C. It depends on engine power setting.
• D. Only when hydraulics are available.

Answer: (B)

In manual bleed valve control, the bleed air sources and valve positions must be explicitly correct to feed wing anti-ice. If you try to provide APU air to the Wing Ice protection system while the bleed valves are manually controlled, the system treats that as a misconfiguration and will close the wing bleed valves. The EICAS then shows BLEED MISCONFIG to alert you that the bleed configuration is not valid for supplying wing anti-ice from the APU in this mode. So, you cannot route APU bleed to the Wing Ice system in this condition; the bleed valves close and the misconfig warning appears. Other factors like engine power or hydraulics don’t change this outcome because the limitation here is the bleed system’s configuration in manual mode.