What is the purpose of branch ducting in the bleed air system?

The purpose of branch ducting in the bleed air system is primarily to distribute air to various systems. In an aircraft, bleed air is taken from the engine's compressor section and is used for multiple functions, including cabin pressurization, engine starts, environmental control, and ice protection. The branch ducting facilitates this by directing the bleed air from the main duct to specific components or systems that require it, ensuring that all necessary systems receive the correct airflow for optimal operation. This distribution is crucial for maintaining the functionality and safety of the aircraft while in flight or on the ground.

Options that suggest isolating components or storing bleed air do not capture the primary role of branch ducting, which is to channel air rather than store or isolate it. Additionally, while preventing reverse airflow is an important consideration in various systems, the specific function of branch ducting is more focused on the effective distribution of air rather than airflow direction or control directly.