What happens if a Cowl Anti-Icing duct ruptures?

• A. The escaping pressurized bleed air is contained inside the outer duct.
• B. It vents to the cabin
• C. It vents to the outside environment
• D. It causes immediate ignition

Answer: (A)

When dealing with cowl anti-icing, the system uses a double-wall duct to carry hot bleed air to the engine nacelle. If the inner duct ruptures, the escaping air is kept inside the outer duct, specifically within the duct’s containment space. This design prevents the hot bleed air from venting into the cabin or escaping directly to the outside, and it avoids ignition since the leak remains within the duct envelope rather than venting to an environment with potential ignition sources.