Final answer:
The APU supplies bleed air to the anti-ice system, air conditioning system, and engines.
Step-by-step explanation:
The APU (Auxiliary Power Unit) supplies bleed air to various systems in an aircraft. One of the bleed air manifold it supplies is the anti-ice system. This system blows hot air onto the wings and tail surfaces to prevent ice formation, which can affect the aircraft's performance and safety.
Another bleed air manifold the APU supplies is the air conditioning system. This system uses the bleed air to cool and pressurize the cabin, ensuring a comfortable environment for passengers and crew.
Furthermore, the APU supplies bleed air to the engines. The bleed air is used for various purposes, such as starting the engines, providing anti-ice protection for engine components, and operating certain accessories and systems.