Cross-wing/main manifold within bleed-air system serves what role?

• A. Distributes bleed air from engine bleed-air manifolds to other ducting
• B. Stores bleed air for later use
• C. Contains fuel lines
• D. Controls cabin lighting

Answer: (A)

In bleed-air systems, air taken from the engine bleed ports is routed to various aircraft systems through a central distribution point. The cross-wing/main manifold acts as that hub, gathering bleed air from the engine bleed sources and feeding it into the aircraft’s ducting network. It splits and routes the air to the environmental control system, wing/engine anti-ice, and other ducted systems, and it enables cross-bleed operation so air can be supplied even if one source is offline. It isn’t a storage device, and it doesn’t carry fuel lines or control cabin lighting.