Can Wing Anti-ice operate on the ground?

Can Wing Anti-ice operate on the ground?

• A. Yes, during flight only
• B. Yes, when initiating a 30 second test sequence by turning the system ON
• C. No, never on the ground
• D. Yes, anytime the system is ON

Answer: (B)

Wing anti-ice uses bleed air to heat the leading edges, but on the ground normal operation is inhibited to save bleed air. There is a built-in ground test that allows the system to run briefly to verify everything is working. By switching the system ON to start this test sequence, the wing anti-ice will operate for about 30 seconds, checking the valves and air supply. That’s why the correct answer is that it can operate on the ground, but only during this specific 30-second test sequence. It isn’t allowed to run freely anytime the system is ON, and it isn’t restricted to flight only or never on the ground.

Wing anti-ice uses bleed air to heat the leading edges, but on the ground normal operation is inhibited to save bleed air. There is a built-in ground test that allows the system to run briefly to verify everything is working. By switching the system ON to start this test sequence, the wing anti-ice will operate for about 30 seconds, checking the valves and air supply. That’s why the correct answer is that it can operate on the ground, but only during this specific 30-second test sequence. It isn’t allowed to run freely anytime the system is ON, and it isn’t restricted to flight only or never on the ground.