Bleed Air System consists of?

• A. Clamped, insulated metal ducts (tubes) of many sizes and shapes which connect system control valves and sensors
• B. Electrical wiring harnesses throughout the aircraft
• C. A network of flexible hoses
• D. A series of clamps used to secure external air lines

Answer: (A)

Bleed air is delivered through a network of insulated metal ducts that transport hot, high‑pressure air from engine bleed ports to the systems that use it, such as environmental control and anti‑ice. These ducts come in various sizes and shapes to route the air where it’s needed and they connect to system control valves and sensors along the path. The ducts are clamped in place and insulated to withstand high temperatures and to prevent heat transfer to surrounding equipment. While you might see hoses or clamps in some interfaces, the main, defining elements of the bleed air system are the rigid, insulated metal ducts that form the pathway for the air and connect to the valves and sensors that regulate it. Electrical wiring harnesses and a network of flexible hoses are not the primary components of the bleed air system.