For testing purposes, wing anti-ice can be operated on the ground for how long?

For testing purposes, wing anti-ice can be operated on the ground for how long?

• A. 15 seconds
• B. 60 seconds
• C. 30 seconds
• D. 90 seconds

Answer: (C)

Wing anti-ice on the ground is tested only briefly to verify that the system valves operate and heat is produced without subjecting the wing leading edge to prolonged heat. The maintenance guidance specifies a 30-second maximum for a ground test, because extended operation can overheat the anti-ice loop, waste bleed-air, and stress components. A short 30-second pulse confirms proper function, and then the system is cycled off and allowed to cooldown before any further testing. Longer runs (like 60 or 90 seconds) are not appropriate for a ground test, while too-short (such as 15 seconds) might not reliably verify heat and valve actuation.

Wing anti-ice on the ground is tested only briefly to verify that the system valves operate and heat is produced without subjecting the wing leading edge to prolonged heat. The maintenance guidance specifies a 30-second maximum for a ground test, because extended operation can overheat the anti-ice loop, waste bleed-air, and stress components. A short 30-second pulse confirms proper function, and then the system is cycled off and allowed to cooldown before any further testing. Longer runs (like 60 or 90 seconds) are not appropriate for a ground test, while too-short (such as 15 seconds) might not reliably verify heat and valve actuation.