The Wing Anti-ice valves will open

The Wing Anti-ice valves will open

• A. In flight
• B. During takeoff
• C. On the ground for 60 seconds
• D. On the ground for 30 seconds

Answer: (D)

Wing anti-ice is kept normally closed to conserve bleed air, and is opened automatically for a short, defined period on the ground. The system provides a brief bleed-air blast to condition the wing leading edges and purge the line, so it’s ready for possible icing conditions at takeoff. That ground window is 30 seconds, which is why the correct choice specifies the aircraft on the ground for 30 seconds. In flight, the valve operation is governed by icing conditions and the ice-protection logic, not a fixed 30-second ground timer, and the options of opening only during takeoff or for longer durations on the ground don’t match the normal ground behavior.

Wing anti-ice is kept normally closed to conserve bleed air, and is opened automatically for a short, defined period on the ground. The system provides a brief bleed-air blast to condition the wing leading edges and purge the line, so it’s ready for possible icing conditions at takeoff. That ground window is 30 seconds, which is why the correct choice specifies the aircraft on the ground for 30 seconds. In flight, the valve operation is governed by icing conditions and the ice-protection logic, not a fixed 30-second ground timer, and the options of opening only during takeoff or for longer durations on the ground don’t match the normal ground behavior.