Is the APU capable of supplying bleed-air to the anti-ice system?

The auxiliary power unit (APU) on the CRJ550 does not have the capability to supply bleed-air to the anti-ice system. This is because the APU's primary function is to provide electrical power and pneumatic pressure for engine starting and cabin conditioning while on the ground. When it comes to the anti-ice system, the aircraft relies on bleed-air from the engines, which is specifically designed to meet the high demands of this critical system in terms of temperature and pressure.

Using engine bleed-air is essential for effective anti-icing performance, as it ensures adequate thermal energy is delivered to the required surfaces to prevent ice accumulation. The engines are designed to provide the necessary bleed-air at the appropriate temperature, which is crucial for the proper functioning of the anti-ice system.